diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/gen/Emitter/Helpers.cs b/src/libraries/Microsoft.Extensions.Configuration.Binder/gen/Emitter/Helpers.cs
index cf9511cf5a6f90..f80edafeced652 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/gen/Emitter/Helpers.cs
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/gen/Emitter/Helpers.cs
@@ -53,10 +53,10 @@ private static class Expression
             private static class TypeDisplayString
             {
                 public const string NullableActionOfBinderOptions = "Action<BinderOptions>?";
-                public const string OptionsBuilderOfTOptions = $"OptionsBuilder<{Identifier.TOptions}>";
-                public const string HashSetOfString = "HashSet<string>";
-                public const string LazyHashSetOfString = "Lazy<HashSet<string>>";
-                public const string ListOfString = "List<string>";
+                public const string OptionsBuilderOfTOptions = $"global::Microsoft.Extensions.Options.OptionsBuilder<{Identifier.TOptions}>";
+                public const string HashSetOfString = "global::System.Collections.Generic.HashSet<string>";
+                public const string LazyHashSetOfString = "Lazy<global::System.Collections.Generic.HashSet<string>>";
+                public const string ListOfString = "global::System.Collections.Generic.List<string>";
             }
 
             private static class Identifier
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/gen/Specs/TypeIndex.cs b/src/libraries/Microsoft.Extensions.Configuration.Binder/gen/Specs/TypeIndex.cs
index 5328d1da922a3a..74ab042c2a7969 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/gen/Specs/TypeIndex.cs
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/gen/Specs/TypeIndex.cs
@@ -85,7 +85,12 @@ public static string GetPopulationCastTypeDisplayString(CollectionWithCtorInitSp
 
         public static string GetGenericTypeDisplayString(CollectionWithCtorInitSpec type, Enum genericProxyTypeName)
         {
-            string proxyTypeNameStr = genericProxyTypeName.ToString();
+            string typeFNQ = type.TypeRef.FullyQualifiedName;
+            int genericIndex = typeFNQ.IndexOf('<');
+
+            // To get the namespace.
+            int lastDotIndex = genericIndex > 0 ? typeFNQ.LastIndexOf('.', genericIndex) : -1;
+            string proxyTypeNameStr = lastDotIndex >= 0 ? $"{typeFNQ.Substring(0, lastDotIndex + 1)}{genericProxyTypeName}" : genericProxyTypeName.ToString();
             string elementTypeFQN = type.ElementTypeRef.FullyQualifiedName;
 
             if (type is EnumerableSpec)
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/Version1/Bind.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/Version1/Bind.generated.txt
index 0b2716ecc60795..c86526984b3d40 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/Version1/Bind.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/Version1/Bind.generated.txt
@@ -90,7 +90,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
         #endregion IConfiguration extensions.
 
         #region Core binding extensions.
-        private readonly static Lazy<HashSet<string>> s_configKeys_Program__MyClass = new(() => new HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyString", "MyInt", "MyList", "MyDictionary", "MyComplexDictionary" });
+        private readonly static Lazy<global::System.Collections.Generic.HashSet<string>> s_configKeys_Program__MyClass = new(() => new global::System.Collections.Generic.HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyString", "MyInt", "MyList", "MyDictionary", "MyComplexDictionary" });
 
         public static void BindCore(IConfiguration configuration, ref global::System.Collections.Generic.List<int> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
@@ -212,17 +212,17 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
 
         /// <summary>If required by the binder options, validates that there are no unknown keys in the input configuration object.</summary>
-        public static void ValidateConfigurationKeys(Type type, Lazy<HashSet<string>> keys, IConfiguration configuration, BinderOptions? binderOptions)
+        public static void ValidateConfigurationKeys(Type type, Lazy<global::System.Collections.Generic.HashSet<string>> keys, IConfiguration configuration, BinderOptions? binderOptions)
         {
             if (binderOptions?.ErrorOnUnknownConfiguration is true)
             {
-                List<string>? temp = null;
+                global::System.Collections.Generic.List<string>? temp = null;
         
                 foreach (IConfigurationSection section in configuration.GetChildren())
                 {
                     if (!keys.Value.Contains(section.Key))
                     {
-                        (temp ??= new List<string>()).Add($"'{section.Key}'");
+                        (temp ??= new global::System.Collections.Generic.List<string>()).Add($"'{section.Key}'");
                     }
                 }
         
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/Version1/Bind_Instance.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/Version1/Bind_Instance.generated.txt
index db4973ec820491..5bc1ad637bd7b5 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/Version1/Bind_Instance.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/Version1/Bind_Instance.generated.txt
@@ -54,7 +54,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
         #endregion IConfiguration extensions.
 
         #region Core binding extensions.
-        private readonly static Lazy<HashSet<string>> s_configKeys_Program__MyClass = new(() => new HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyString", "MyInt", "MyList", "MyDictionary", "MyComplexDictionary" });
+        private readonly static Lazy<global::System.Collections.Generic.HashSet<string>> s_configKeys_Program__MyClass = new(() => new global::System.Collections.Generic.HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyString", "MyInt", "MyList", "MyDictionary", "MyComplexDictionary" });
 
         public static void BindCore(IConfiguration configuration, ref global::System.Collections.Generic.List<int> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
@@ -176,17 +176,17 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
 
         /// <summary>If required by the binder options, validates that there are no unknown keys in the input configuration object.</summary>
-        public static void ValidateConfigurationKeys(Type type, Lazy<HashSet<string>> keys, IConfiguration configuration, BinderOptions? binderOptions)
+        public static void ValidateConfigurationKeys(Type type, Lazy<global::System.Collections.Generic.HashSet<string>> keys, IConfiguration configuration, BinderOptions? binderOptions)
         {
             if (binderOptions?.ErrorOnUnknownConfiguration is true)
             {
-                List<string>? temp = null;
+                global::System.Collections.Generic.List<string>? temp = null;
         
                 foreach (IConfigurationSection section in configuration.GetChildren())
                 {
                     if (!keys.Value.Contains(section.Key))
                     {
-                        (temp ??= new List<string>()).Add($"'{section.Key}'");
+                        (temp ??= new global::System.Collections.Generic.List<string>()).Add($"'{section.Key}'");
                     }
                 }
         
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/Version1/Bind_Instance_BinderOptions.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/Version1/Bind_Instance_BinderOptions.generated.txt
index 8107c8e1f5be88..c6c7feafc3cd66 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/Version1/Bind_Instance_BinderOptions.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/Version1/Bind_Instance_BinderOptions.generated.txt
@@ -54,7 +54,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
         #endregion IConfiguration extensions.
 
         #region Core binding extensions.
-        private readonly static Lazy<HashSet<string>> s_configKeys_Program__MyClass = new(() => new HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyString", "MyInt", "MyList", "MyDictionary", "MyComplexDictionary" });
+        private readonly static Lazy<global::System.Collections.Generic.HashSet<string>> s_configKeys_Program__MyClass = new(() => new global::System.Collections.Generic.HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyString", "MyInt", "MyList", "MyDictionary", "MyComplexDictionary" });
 
         public static void BindCore(IConfiguration configuration, ref global::System.Collections.Generic.List<int> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
@@ -176,17 +176,17 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
 
         /// <summary>If required by the binder options, validates that there are no unknown keys in the input configuration object.</summary>
-        public static void ValidateConfigurationKeys(Type type, Lazy<HashSet<string>> keys, IConfiguration configuration, BinderOptions? binderOptions)
+        public static void ValidateConfigurationKeys(Type type, Lazy<global::System.Collections.Generic.HashSet<string>> keys, IConfiguration configuration, BinderOptions? binderOptions)
         {
             if (binderOptions?.ErrorOnUnknownConfiguration is true)
             {
-                List<string>? temp = null;
+                global::System.Collections.Generic.List<string>? temp = null;
         
                 foreach (IConfigurationSection section in configuration.GetChildren())
                 {
                     if (!keys.Value.Contains(section.Key))
                     {
-                        (temp ??= new List<string>()).Add($"'{section.Key}'");
+                        (temp ??= new global::System.Collections.Generic.List<string>()).Add($"'{section.Key}'");
                     }
                 }
         
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/Version1/Bind_Key_Instance.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/Version1/Bind_Key_Instance.generated.txt
index 790287e96b73e8..27ada27eeb2f74 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/Version1/Bind_Key_Instance.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/Version1/Bind_Key_Instance.generated.txt
@@ -54,7 +54,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
         #endregion IConfiguration extensions.
 
         #region Core binding extensions.
-        private readonly static Lazy<HashSet<string>> s_configKeys_Program__MyClass = new(() => new HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyString", "MyInt", "MyList", "MyDictionary", "MyComplexDictionary" });
+        private readonly static Lazy<global::System.Collections.Generic.HashSet<string>> s_configKeys_Program__MyClass = new(() => new global::System.Collections.Generic.HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyString", "MyInt", "MyList", "MyDictionary", "MyComplexDictionary" });
 
         public static void BindCore(IConfiguration configuration, ref global::System.Collections.Generic.List<int> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
@@ -176,17 +176,17 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
 
         /// <summary>If required by the binder options, validates that there are no unknown keys in the input configuration object.</summary>
-        public static void ValidateConfigurationKeys(Type type, Lazy<HashSet<string>> keys, IConfiguration configuration, BinderOptions? binderOptions)
+        public static void ValidateConfigurationKeys(Type type, Lazy<global::System.Collections.Generic.HashSet<string>> keys, IConfiguration configuration, BinderOptions? binderOptions)
         {
             if (binderOptions?.ErrorOnUnknownConfiguration is true)
             {
-                List<string>? temp = null;
+                global::System.Collections.Generic.List<string>? temp = null;
         
                 foreach (IConfigurationSection section in configuration.GetChildren())
                 {
                     if (!keys.Value.Contains(section.Key))
                     {
-                        (temp ??= new List<string>()).Add($"'{section.Key}'");
+                        (temp ??= new global::System.Collections.Generic.List<string>()).Add($"'{section.Key}'");
                     }
                 }
         
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/Version1/Get.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/Version1/Get.generated.txt
index 5cec1445fafd02..07b5468ceea345 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/Version1/Get.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/Version1/Get.generated.txt
@@ -52,8 +52,8 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
         #endregion IConfiguration extensions.
 
         #region Core binding extensions.
-        private readonly static Lazy<HashSet<string>> s_configKeys_Program__MyClass = new(() => new HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyString", "MyInt", "MyList", "MyArray", "MyDictionary" });
-        private readonly static Lazy<HashSet<string>> s_configKeys_Program__MyClass2 = new(() => new HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyInt" });
+        private readonly static Lazy<global::System.Collections.Generic.HashSet<string>> s_configKeys_Program__MyClass = new(() => new global::System.Collections.Generic.HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyString", "MyInt", "MyList", "MyArray", "MyDictionary" });
+        private readonly static Lazy<global::System.Collections.Generic.HashSet<string>> s_configKeys_Program__MyClass2 = new(() => new global::System.Collections.Generic.HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyInt" });
 
         public static object? GetCore(this IConfiguration configuration, Type type, Action<BinderOptions>? configureOptions)
         {
@@ -234,17 +234,17 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
 
         /// <summary>If required by the binder options, validates that there are no unknown keys in the input configuration object.</summary>
-        public static void ValidateConfigurationKeys(Type type, Lazy<HashSet<string>> keys, IConfiguration configuration, BinderOptions? binderOptions)
+        public static void ValidateConfigurationKeys(Type type, Lazy<global::System.Collections.Generic.HashSet<string>> keys, IConfiguration configuration, BinderOptions? binderOptions)
         {
             if (binderOptions?.ErrorOnUnknownConfiguration is true)
             {
-                List<string>? temp = null;
+                global::System.Collections.Generic.List<string>? temp = null;
         
                 foreach (IConfigurationSection section in configuration.GetChildren())
                 {
                     if (!keys.Value.Contains(section.Key))
                     {
-                        (temp ??= new List<string>()).Add($"'{section.Key}'");
+                        (temp ??= new global::System.Collections.Generic.List<string>()).Add($"'{section.Key}'");
                     }
                 }
         
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/Version1/Get_T.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/Version1/Get_T.generated.txt
index cb1da974cf3580..2067a714833529 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/Version1/Get_T.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/Version1/Get_T.generated.txt
@@ -40,7 +40,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
         #endregion IConfiguration extensions.
 
         #region Core binding extensions.
-        private readonly static Lazy<HashSet<string>> s_configKeys_Program__MyClass = new(() => new HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyString", "MyInt", "MyList", "MyArray", "MyDictionary" });
+        private readonly static Lazy<global::System.Collections.Generic.HashSet<string>> s_configKeys_Program__MyClass = new(() => new global::System.Collections.Generic.HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyString", "MyInt", "MyList", "MyArray", "MyDictionary" });
 
         public static object? GetCore(this IConfiguration configuration, Type type, Action<BinderOptions>? configureOptions)
         {
@@ -198,17 +198,17 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
 
         /// <summary>If required by the binder options, validates that there are no unknown keys in the input configuration object.</summary>
-        public static void ValidateConfigurationKeys(Type type, Lazy<HashSet<string>> keys, IConfiguration configuration, BinderOptions? binderOptions)
+        public static void ValidateConfigurationKeys(Type type, Lazy<global::System.Collections.Generic.HashSet<string>> keys, IConfiguration configuration, BinderOptions? binderOptions)
         {
             if (binderOptions?.ErrorOnUnknownConfiguration is true)
             {
-                List<string>? temp = null;
+                global::System.Collections.Generic.List<string>? temp = null;
         
                 foreach (IConfigurationSection section in configuration.GetChildren())
                 {
                     if (!keys.Value.Contains(section.Key))
                     {
-                        (temp ??= new List<string>()).Add($"'{section.Key}'");
+                        (temp ??= new global::System.Collections.Generic.List<string>()).Add($"'{section.Key}'");
                     }
                 }
         
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/Version1/Get_T_BinderOptions.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/Version1/Get_T_BinderOptions.generated.txt
index 76fb75a9f188d5..7f443cb8ec7c26 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/Version1/Get_T_BinderOptions.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/Version1/Get_T_BinderOptions.generated.txt
@@ -40,7 +40,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
         #endregion IConfiguration extensions.
 
         #region Core binding extensions.
-        private readonly static Lazy<HashSet<string>> s_configKeys_Program__MyClass = new(() => new HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyString", "MyInt", "MyList", "MyArray", "MyDictionary" });
+        private readonly static Lazy<global::System.Collections.Generic.HashSet<string>> s_configKeys_Program__MyClass = new(() => new global::System.Collections.Generic.HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyString", "MyInt", "MyList", "MyArray", "MyDictionary" });
 
         public static object? GetCore(this IConfiguration configuration, Type type, Action<BinderOptions>? configureOptions)
         {
@@ -198,17 +198,17 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
 
         /// <summary>If required by the binder options, validates that there are no unknown keys in the input configuration object.</summary>
-        public static void ValidateConfigurationKeys(Type type, Lazy<HashSet<string>> keys, IConfiguration configuration, BinderOptions? binderOptions)
+        public static void ValidateConfigurationKeys(Type type, Lazy<global::System.Collections.Generic.HashSet<string>> keys, IConfiguration configuration, BinderOptions? binderOptions)
         {
             if (binderOptions?.ErrorOnUnknownConfiguration is true)
             {
-                List<string>? temp = null;
+                global::System.Collections.Generic.List<string>? temp = null;
         
                 foreach (IConfigurationSection section in configuration.GetChildren())
                 {
                     if (!keys.Value.Contains(section.Key))
                     {
-                        (temp ??= new List<string>()).Add($"'{section.Key}'");
+                        (temp ??= new global::System.Collections.Generic.List<string>()).Add($"'{section.Key}'");
                     }
                 }
         
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/Version1/Get_TypeOf.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/Version1/Get_TypeOf.generated.txt
index cf0957f55679a9..aa8ad68a97fb6f 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/Version1/Get_TypeOf.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/Version1/Get_TypeOf.generated.txt
@@ -40,7 +40,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
         #endregion IConfiguration extensions.
 
         #region Core binding extensions.
-        private readonly static Lazy<HashSet<string>> s_configKeys_Program__MyClass2 = new(() => new HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyInt" });
+        private readonly static Lazy<global::System.Collections.Generic.HashSet<string>> s_configKeys_Program__MyClass2 = new(() => new global::System.Collections.Generic.HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyInt" });
 
         public static object? GetCore(this IConfiguration configuration, Type type, Action<BinderOptions>? configureOptions)
         {
@@ -97,17 +97,17 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
 
         /// <summary>If required by the binder options, validates that there are no unknown keys in the input configuration object.</summary>
-        public static void ValidateConfigurationKeys(Type type, Lazy<HashSet<string>> keys, IConfiguration configuration, BinderOptions? binderOptions)
+        public static void ValidateConfigurationKeys(Type type, Lazy<global::System.Collections.Generic.HashSet<string>> keys, IConfiguration configuration, BinderOptions? binderOptions)
         {
             if (binderOptions?.ErrorOnUnknownConfiguration is true)
             {
-                List<string>? temp = null;
+                global::System.Collections.Generic.List<string>? temp = null;
         
                 foreach (IConfigurationSection section in configuration.GetChildren())
                 {
                     if (!keys.Value.Contains(section.Key))
                     {
-                        (temp ??= new List<string>()).Add($"'{section.Key}'");
+                        (temp ??= new global::System.Collections.Generic.List<string>()).Add($"'{section.Key}'");
                     }
                 }
         
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/Version1/Get_TypeOf_BinderOptions.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/Version1/Get_TypeOf_BinderOptions.generated.txt
index 9dd72429d26c97..b95a885ec261a7 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/Version1/Get_TypeOf_BinderOptions.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ConfigurationBinder/Version1/Get_TypeOf_BinderOptions.generated.txt
@@ -40,7 +40,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
         #endregion IConfiguration extensions.
 
         #region Core binding extensions.
-        private readonly static Lazy<HashSet<string>> s_configKeys_Program__MyClass2 = new(() => new HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyInt" });
+        private readonly static Lazy<global::System.Collections.Generic.HashSet<string>> s_configKeys_Program__MyClass2 = new(() => new global::System.Collections.Generic.HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyInt" });
 
         public static object? GetCore(this IConfiguration configuration, Type type, Action<BinderOptions>? configureOptions)
         {
@@ -97,17 +97,17 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
 
         /// <summary>If required by the binder options, validates that there are no unknown keys in the input configuration object.</summary>
-        public static void ValidateConfigurationKeys(Type type, Lazy<HashSet<string>> keys, IConfiguration configuration, BinderOptions? binderOptions)
+        public static void ValidateConfigurationKeys(Type type, Lazy<global::System.Collections.Generic.HashSet<string>> keys, IConfiguration configuration, BinderOptions? binderOptions)
         {
             if (binderOptions?.ErrorOnUnknownConfiguration is true)
             {
-                List<string>? temp = null;
+                global::System.Collections.Generic.List<string>? temp = null;
         
                 foreach (IConfigurationSection section in configuration.GetChildren())
                 {
                     if (!keys.Value.Contains(section.Key))
                     {
-                        (temp ??= new List<string>()).Add($"'{section.Key}'");
+                        (temp ??= new global::System.Collections.Generic.List<string>()).Add($"'{section.Key}'");
                     }
                 }
         
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/OptionsBuilder/Version1/BindConfiguration.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/OptionsBuilder/Version1/BindConfiguration.generated.txt
index 70a314c7f6381b..0a2c4f8f3f95a8 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/OptionsBuilder/Version1/BindConfiguration.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/OptionsBuilder/Version1/BindConfiguration.generated.txt
@@ -35,10 +35,10 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
     [GeneratedCode("Microsoft.Extensions.Configuration.Binder.SourceGeneration", "42.42.42.42")]
     file static class BindingExtensions
     {
-        #region OptionsBuilder<TOptions> extensions.
+        #region global::Microsoft.Extensions.Options.OptionsBuilder<TOptions> extensions.
         /// <summary>Registers the dependency injection container to bind <typeparamref name="TOptions"/> against the <see cref="IConfiguration"/> obtained from the DI service provider.</summary>
         [InterceptsLocation(1, "dQtLTBW+V+KExKSKfSGYWHgBAABzcmMtMC5jcw==")] // src-0.cs(12,24)
-        public static OptionsBuilder<TOptions> BindConfiguration<TOptions>(this OptionsBuilder<TOptions> optionsBuilder, string configSectionPath, Action<BinderOptions>? configureBinder = null) where TOptions : class
+        public static global::Microsoft.Extensions.Options.OptionsBuilder<TOptions> BindConfiguration<TOptions>(this global::Microsoft.Extensions.Options.OptionsBuilder<TOptions> optionsBuilder, string configSectionPath, Action<BinderOptions>? configureBinder = null) where TOptions : class
         {
             if (optionsBuilder is null)
             {
@@ -68,10 +68,10 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
             return optionsBuilder;
         }
-        #endregion OptionsBuilder<TOptions> extensions.
+        #endregion global::Microsoft.Extensions.Options.OptionsBuilder<TOptions> extensions.
 
         #region Core binding extensions.
-        private readonly static Lazy<HashSet<string>> s_configKeys_Program__MyClass = new(() => new HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyString", "MyInt", "MyList" });
+        private readonly static Lazy<global::System.Collections.Generic.HashSet<string>> s_configKeys_Program__MyClass = new(() => new global::System.Collections.Generic.HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyString", "MyInt", "MyList" });
 
         public static void BindCoreMain(IConfiguration configuration, object instance, Type type, Action<BinderOptions>? configureOptions)
         {
@@ -168,17 +168,17 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
 
         /// <summary>If required by the binder options, validates that there are no unknown keys in the input configuration object.</summary>
-        public static void ValidateConfigurationKeys(Type type, Lazy<HashSet<string>> keys, IConfiguration configuration, BinderOptions? binderOptions)
+        public static void ValidateConfigurationKeys(Type type, Lazy<global::System.Collections.Generic.HashSet<string>> keys, IConfiguration configuration, BinderOptions? binderOptions)
         {
             if (binderOptions?.ErrorOnUnknownConfiguration is true)
             {
-                List<string>? temp = null;
+                global::System.Collections.Generic.List<string>? temp = null;
         
                 foreach (IConfigurationSection section in configuration.GetChildren())
                 {
                     if (!keys.Value.Contains(section.Key))
                     {
-                        (temp ??= new List<string>()).Add($"'{section.Key}'");
+                        (temp ??= new global::System.Collections.Generic.List<string>()).Add($"'{section.Key}'");
                     }
                 }
         
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/OptionsBuilder/Version1/BindConfigurationWithConfigureActions.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/OptionsBuilder/Version1/BindConfigurationWithConfigureActions.generated.txt
index 4f2e4f38881727..b357b97fc261a0 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/OptionsBuilder/Version1/BindConfigurationWithConfigureActions.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/OptionsBuilder/Version1/BindConfigurationWithConfigureActions.generated.txt
@@ -35,10 +35,10 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
     [GeneratedCode("Microsoft.Extensions.Configuration.Binder.SourceGeneration", "42.42.42.42")]
     file static class BindingExtensions
     {
-        #region OptionsBuilder<TOptions> extensions.
+        #region global::Microsoft.Extensions.Options.OptionsBuilder<TOptions> extensions.
         /// <summary>Registers the dependency injection container to bind <typeparamref name="TOptions"/> against the <see cref="IConfiguration"/> obtained from the DI service provider.</summary>
         [InterceptsLocation(1, "+juUY8RZzi0MOViHimSQBXgBAABzcmMtMC5jcw==")] // src-0.cs(12,24)
-        public static OptionsBuilder<TOptions> BindConfiguration<TOptions>(this OptionsBuilder<TOptions> optionsBuilder, string configSectionPath, Action<BinderOptions>? configureBinder = null) where TOptions : class
+        public static global::Microsoft.Extensions.Options.OptionsBuilder<TOptions> BindConfiguration<TOptions>(this global::Microsoft.Extensions.Options.OptionsBuilder<TOptions> optionsBuilder, string configSectionPath, Action<BinderOptions>? configureBinder = null) where TOptions : class
         {
             if (optionsBuilder is null)
             {
@@ -68,10 +68,10 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
             return optionsBuilder;
         }
-        #endregion OptionsBuilder<TOptions> extensions.
+        #endregion global::Microsoft.Extensions.Options.OptionsBuilder<TOptions> extensions.
 
         #region Core binding extensions.
-        private readonly static Lazy<HashSet<string>> s_configKeys_Program__MyClass = new(() => new HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyString", "MyInt", "MyList" });
+        private readonly static Lazy<global::System.Collections.Generic.HashSet<string>> s_configKeys_Program__MyClass = new(() => new global::System.Collections.Generic.HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyString", "MyInt", "MyList" });
 
         public static void BindCoreMain(IConfiguration configuration, object instance, Type type, Action<BinderOptions>? configureOptions)
         {
@@ -168,17 +168,17 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
 
         /// <summary>If required by the binder options, validates that there are no unknown keys in the input configuration object.</summary>
-        public static void ValidateConfigurationKeys(Type type, Lazy<HashSet<string>> keys, IConfiguration configuration, BinderOptions? binderOptions)
+        public static void ValidateConfigurationKeys(Type type, Lazy<global::System.Collections.Generic.HashSet<string>> keys, IConfiguration configuration, BinderOptions? binderOptions)
         {
             if (binderOptions?.ErrorOnUnknownConfiguration is true)
             {
-                List<string>? temp = null;
+                global::System.Collections.Generic.List<string>? temp = null;
         
                 foreach (IConfigurationSection section in configuration.GetChildren())
                 {
                     if (!keys.Value.Contains(section.Key))
                     {
-                        (temp ??= new List<string>()).Add($"'{section.Key}'");
+                        (temp ??= new global::System.Collections.Generic.List<string>()).Add($"'{section.Key}'");
                     }
                 }
         
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/OptionsBuilder/Version1/Bind_T.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/OptionsBuilder/Version1/Bind_T.generated.txt
index 32d1b8094aaa98..013ef9e450173f 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/OptionsBuilder/Version1/Bind_T.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/OptionsBuilder/Version1/Bind_T.generated.txt
@@ -35,16 +35,16 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
     [GeneratedCode("Microsoft.Extensions.Configuration.Binder.SourceGeneration", "42.42.42.42")]
     file static class BindingExtensions
     {
-        #region OptionsBuilder<TOptions> extensions.
+        #region global::Microsoft.Extensions.Options.OptionsBuilder<TOptions> extensions.
         /// <summary>Registers a configuration instance which <typeparamref name="TOptions"/> will bind against.</summary>
         [InterceptsLocation(1, "/HkAEr/Ik8W47keDiXaNkeEBAABzcmMtMC5jcw==")] // src-0.cs(15,24)
-        public static OptionsBuilder<TOptions> Bind<TOptions>(this OptionsBuilder<TOptions> optionsBuilder, IConfiguration config) where TOptions : class
+        public static global::Microsoft.Extensions.Options.OptionsBuilder<TOptions> Bind<TOptions>(this global::Microsoft.Extensions.Options.OptionsBuilder<TOptions> optionsBuilder, IConfiguration config) where TOptions : class
         {
             return Bind(optionsBuilder, config, configureBinder: null);
         }
 
         /// <summary>Registers a configuration instance which <typeparamref name="TOptions"/> will bind against.</summary>
-        public static OptionsBuilder<TOptions> Bind<TOptions>(this OptionsBuilder<TOptions> optionsBuilder, IConfiguration config, Action<BinderOptions>? configureBinder) where TOptions : class
+        public static global::Microsoft.Extensions.Options.OptionsBuilder<TOptions> Bind<TOptions>(this global::Microsoft.Extensions.Options.OptionsBuilder<TOptions> optionsBuilder, IConfiguration config, Action<BinderOptions>? configureBinder) where TOptions : class
         {
             if (optionsBuilder is null)
             {
@@ -54,7 +54,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             Configure<TOptions>(optionsBuilder.Services, optionsBuilder.Name, config, configureBinder);
             return optionsBuilder;
         }
-        #endregion OptionsBuilder<TOptions> extensions.
+        #endregion global::Microsoft.Extensions.Options.OptionsBuilder<TOptions> extensions.
 
         #region IServiceCollection extensions.
         /// <summary>Registers a configuration instance which TOptions will bind against.</summary>
@@ -77,7 +77,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
         #endregion IServiceCollection extensions.
 
         #region Core binding extensions.
-        private readonly static Lazy<HashSet<string>> s_configKeys_Program__MyClass = new(() => new HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyString", "MyInt", "MyList" });
+        private readonly static Lazy<global::System.Collections.Generic.HashSet<string>> s_configKeys_Program__MyClass = new(() => new global::System.Collections.Generic.HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyString", "MyInt", "MyList" });
 
         public static void BindCoreMain(IConfiguration configuration, object instance, Type type, Action<BinderOptions>? configureOptions)
         {
@@ -174,17 +174,17 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
 
         /// <summary>If required by the binder options, validates that there are no unknown keys in the input configuration object.</summary>
-        public static void ValidateConfigurationKeys(Type type, Lazy<HashSet<string>> keys, IConfiguration configuration, BinderOptions? binderOptions)
+        public static void ValidateConfigurationKeys(Type type, Lazy<global::System.Collections.Generic.HashSet<string>> keys, IConfiguration configuration, BinderOptions? binderOptions)
         {
             if (binderOptions?.ErrorOnUnknownConfiguration is true)
             {
-                List<string>? temp = null;
+                global::System.Collections.Generic.List<string>? temp = null;
         
                 foreach (IConfigurationSection section in configuration.GetChildren())
                 {
                     if (!keys.Value.Contains(section.Key))
                     {
-                        (temp ??= new List<string>()).Add($"'{section.Key}'");
+                        (temp ??= new global::System.Collections.Generic.List<string>()).Add($"'{section.Key}'");
                     }
                 }
         
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/OptionsBuilder/Version1/Bind_T_BinderOptions.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/OptionsBuilder/Version1/Bind_T_BinderOptions.generated.txt
index 25178f08033f36..eccfa299c31c60 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/OptionsBuilder/Version1/Bind_T_BinderOptions.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/OptionsBuilder/Version1/Bind_T_BinderOptions.generated.txt
@@ -35,10 +35,10 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
     [GeneratedCode("Microsoft.Extensions.Configuration.Binder.SourceGeneration", "42.42.42.42")]
     file static class BindingExtensions
     {
-        #region OptionsBuilder<TOptions> extensions.
+        #region global::Microsoft.Extensions.Options.OptionsBuilder<TOptions> extensions.
         /// <summary>Registers a configuration instance which <typeparamref name="TOptions"/> will bind against.</summary>
         [InterceptsLocation(1, "eAEQHTx/qUZMzyaWapEG3uEBAABzcmMtMC5jcw==")] // src-0.cs(15,24)
-        public static OptionsBuilder<TOptions> Bind<TOptions>(this OptionsBuilder<TOptions> optionsBuilder, IConfiguration config, Action<BinderOptions>? configureBinder) where TOptions : class
+        public static global::Microsoft.Extensions.Options.OptionsBuilder<TOptions> Bind<TOptions>(this global::Microsoft.Extensions.Options.OptionsBuilder<TOptions> optionsBuilder, IConfiguration config, Action<BinderOptions>? configureBinder) where TOptions : class
         {
             if (optionsBuilder is null)
             {
@@ -48,7 +48,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             Configure<TOptions>(optionsBuilder.Services, optionsBuilder.Name, config, configureBinder);
             return optionsBuilder;
         }
-        #endregion OptionsBuilder<TOptions> extensions.
+        #endregion global::Microsoft.Extensions.Options.OptionsBuilder<TOptions> extensions.
 
         #region IServiceCollection extensions.
         /// <summary>Registers a configuration instance which TOptions will bind against.</summary>
@@ -71,7 +71,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
         #endregion IServiceCollection extensions.
 
         #region Core binding extensions.
-        private readonly static Lazy<HashSet<string>> s_configKeys_Program__MyClass = new(() => new HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyString", "MyInt", "MyList" });
+        private readonly static Lazy<global::System.Collections.Generic.HashSet<string>> s_configKeys_Program__MyClass = new(() => new global::System.Collections.Generic.HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyString", "MyInt", "MyList" });
 
         public static void BindCoreMain(IConfiguration configuration, object instance, Type type, Action<BinderOptions>? configureOptions)
         {
@@ -168,17 +168,17 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
 
         /// <summary>If required by the binder options, validates that there are no unknown keys in the input configuration object.</summary>
-        public static void ValidateConfigurationKeys(Type type, Lazy<HashSet<string>> keys, IConfiguration configuration, BinderOptions? binderOptions)
+        public static void ValidateConfigurationKeys(Type type, Lazy<global::System.Collections.Generic.HashSet<string>> keys, IConfiguration configuration, BinderOptions? binderOptions)
         {
             if (binderOptions?.ErrorOnUnknownConfiguration is true)
             {
-                List<string>? temp = null;
+                global::System.Collections.Generic.List<string>? temp = null;
         
                 foreach (IConfigurationSection section in configuration.GetChildren())
                 {
                     if (!keys.Value.Contains(section.Key))
                     {
-                        (temp ??= new List<string>()).Add($"'{section.Key}'");
+                        (temp ??= new global::System.Collections.Generic.List<string>()).Add($"'{section.Key}'");
                     }
                 }
         
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ServiceCollection/Version1/Configure_T.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ServiceCollection/Version1/Configure_T.generated.txt
index f163010342e3e9..c7848d855b7ebd 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ServiceCollection/Version1/Configure_T.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ServiceCollection/Version1/Configure_T.generated.txt
@@ -64,8 +64,8 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
         #endregion IServiceCollection extensions.
 
         #region Core binding extensions.
-        private readonly static Lazy<HashSet<string>> s_configKeys_Program__MyClass2 = new(() => new HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyInt" });
-        private readonly static Lazy<HashSet<string>> s_configKeys_Program__MyClass = new(() => new HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyString", "MyInt", "MyList", "MyList2", "MyDictionary" });
+        private readonly static Lazy<global::System.Collections.Generic.HashSet<string>> s_configKeys_Program__MyClass2 = new(() => new global::System.Collections.Generic.HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyInt" });
+        private readonly static Lazy<global::System.Collections.Generic.HashSet<string>> s_configKeys_Program__MyClass = new(() => new global::System.Collections.Generic.HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyString", "MyInt", "MyList", "MyList2", "MyDictionary" });
 
         public static void BindCoreMain(IConfiguration configuration, object instance, Type type, Action<BinderOptions>? configureOptions)
         {
@@ -230,17 +230,17 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
 
         /// <summary>If required by the binder options, validates that there are no unknown keys in the input configuration object.</summary>
-        public static void ValidateConfigurationKeys(Type type, Lazy<HashSet<string>> keys, IConfiguration configuration, BinderOptions? binderOptions)
+        public static void ValidateConfigurationKeys(Type type, Lazy<global::System.Collections.Generic.HashSet<string>> keys, IConfiguration configuration, BinderOptions? binderOptions)
         {
             if (binderOptions?.ErrorOnUnknownConfiguration is true)
             {
-                List<string>? temp = null;
+                global::System.Collections.Generic.List<string>? temp = null;
         
                 foreach (IConfigurationSection section in configuration.GetChildren())
                 {
                     if (!keys.Value.Contains(section.Key))
                     {
-                        (temp ??= new List<string>()).Add($"'{section.Key}'");
+                        (temp ??= new global::System.Collections.Generic.List<string>()).Add($"'{section.Key}'");
                     }
                 }
         
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ServiceCollection/Version1/Configure_T_BinderOptions.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ServiceCollection/Version1/Configure_T_BinderOptions.generated.txt
index 659ba0253896a8..074cead2a39a8b 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ServiceCollection/Version1/Configure_T_BinderOptions.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ServiceCollection/Version1/Configure_T_BinderOptions.generated.txt
@@ -64,8 +64,8 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
         #endregion IServiceCollection extensions.
 
         #region Core binding extensions.
-        private readonly static Lazy<HashSet<string>> s_configKeys_Program__MyClass2 = new(() => new HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyInt" });
-        private readonly static Lazy<HashSet<string>> s_configKeys_Program__MyClass = new(() => new HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyString", "MyInt", "MyList", "MyList2", "MyDictionary" });
+        private readonly static Lazy<global::System.Collections.Generic.HashSet<string>> s_configKeys_Program__MyClass2 = new(() => new global::System.Collections.Generic.HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyInt" });
+        private readonly static Lazy<global::System.Collections.Generic.HashSet<string>> s_configKeys_Program__MyClass = new(() => new global::System.Collections.Generic.HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyString", "MyInt", "MyList", "MyList2", "MyDictionary" });
 
         public static void BindCoreMain(IConfiguration configuration, object instance, Type type, Action<BinderOptions>? configureOptions)
         {
@@ -230,17 +230,17 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
 
         /// <summary>If required by the binder options, validates that there are no unknown keys in the input configuration object.</summary>
-        public static void ValidateConfigurationKeys(Type type, Lazy<HashSet<string>> keys, IConfiguration configuration, BinderOptions? binderOptions)
+        public static void ValidateConfigurationKeys(Type type, Lazy<global::System.Collections.Generic.HashSet<string>> keys, IConfiguration configuration, BinderOptions? binderOptions)
         {
             if (binderOptions?.ErrorOnUnknownConfiguration is true)
             {
-                List<string>? temp = null;
+                global::System.Collections.Generic.List<string>? temp = null;
         
                 foreach (IConfigurationSection section in configuration.GetChildren())
                 {
                     if (!keys.Value.Contains(section.Key))
                     {
-                        (temp ??= new List<string>()).Add($"'{section.Key}'");
+                        (temp ??= new global::System.Collections.Generic.List<string>()).Add($"'{section.Key}'");
                     }
                 }
         
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ServiceCollection/Version1/Configure_T_name.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ServiceCollection/Version1/Configure_T_name.generated.txt
index c41ec585212ae1..8500b226e943a5 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ServiceCollection/Version1/Configure_T_name.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ServiceCollection/Version1/Configure_T_name.generated.txt
@@ -64,8 +64,8 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
         #endregion IServiceCollection extensions.
 
         #region Core binding extensions.
-        private readonly static Lazy<HashSet<string>> s_configKeys_Program__MyClass2 = new(() => new HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyInt" });
-        private readonly static Lazy<HashSet<string>> s_configKeys_Program__MyClass = new(() => new HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyString", "MyInt", "MyList", "MyList2", "MyDictionary" });
+        private readonly static Lazy<global::System.Collections.Generic.HashSet<string>> s_configKeys_Program__MyClass2 = new(() => new global::System.Collections.Generic.HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyInt" });
+        private readonly static Lazy<global::System.Collections.Generic.HashSet<string>> s_configKeys_Program__MyClass = new(() => new global::System.Collections.Generic.HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyString", "MyInt", "MyList", "MyList2", "MyDictionary" });
 
         public static void BindCoreMain(IConfiguration configuration, object instance, Type type, Action<BinderOptions>? configureOptions)
         {
@@ -230,17 +230,17 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
 
         /// <summary>If required by the binder options, validates that there are no unknown keys in the input configuration object.</summary>
-        public static void ValidateConfigurationKeys(Type type, Lazy<HashSet<string>> keys, IConfiguration configuration, BinderOptions? binderOptions)
+        public static void ValidateConfigurationKeys(Type type, Lazy<global::System.Collections.Generic.HashSet<string>> keys, IConfiguration configuration, BinderOptions? binderOptions)
         {
             if (binderOptions?.ErrorOnUnknownConfiguration is true)
             {
-                List<string>? temp = null;
+                global::System.Collections.Generic.List<string>? temp = null;
         
                 foreach (IConfigurationSection section in configuration.GetChildren())
                 {
                     if (!keys.Value.Contains(section.Key))
                     {
-                        (temp ??= new List<string>()).Add($"'{section.Key}'");
+                        (temp ??= new global::System.Collections.Generic.List<string>()).Add($"'{section.Key}'");
                     }
                 }
         
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ServiceCollection/Version1/Configure_T_name_BinderOptions.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ServiceCollection/Version1/Configure_T_name_BinderOptions.generated.txt
index 6ef54170c0696e..8a6cbcdd238908 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ServiceCollection/Version1/Configure_T_name_BinderOptions.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/ServiceCollection/Version1/Configure_T_name_BinderOptions.generated.txt
@@ -58,8 +58,8 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
         #endregion IServiceCollection extensions.
 
         #region Core binding extensions.
-        private readonly static Lazy<HashSet<string>> s_configKeys_Program__MyClass2 = new(() => new HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyInt" });
-        private readonly static Lazy<HashSet<string>> s_configKeys_Program__MyClass = new(() => new HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyString", "MyInt", "MyList", "MyList2", "MyDictionary" });
+        private readonly static Lazy<global::System.Collections.Generic.HashSet<string>> s_configKeys_Program__MyClass2 = new(() => new global::System.Collections.Generic.HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyInt" });
+        private readonly static Lazy<global::System.Collections.Generic.HashSet<string>> s_configKeys_Program__MyClass = new(() => new global::System.Collections.Generic.HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyString", "MyInt", "MyList", "MyList2", "MyDictionary" });
 
         public static void BindCoreMain(IConfiguration configuration, object instance, Type type, Action<BinderOptions>? configureOptions)
         {
@@ -224,17 +224,17 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
 
         /// <summary>If required by the binder options, validates that there are no unknown keys in the input configuration object.</summary>
-        public static void ValidateConfigurationKeys(Type type, Lazy<HashSet<string>> keys, IConfiguration configuration, BinderOptions? binderOptions)
+        public static void ValidateConfigurationKeys(Type type, Lazy<global::System.Collections.Generic.HashSet<string>> keys, IConfiguration configuration, BinderOptions? binderOptions)
         {
             if (binderOptions?.ErrorOnUnknownConfiguration is true)
             {
-                List<string>? temp = null;
+                global::System.Collections.Generic.List<string>? temp = null;
         
                 foreach (IConfigurationSection section in configuration.GetChildren())
                 {
                     if (!keys.Value.Contains(section.Key))
                     {
-                        (temp ??= new List<string>()).Add($"'{section.Key}'");
+                        (temp ??= new global::System.Collections.Generic.List<string>()).Add($"'{section.Key}'");
                     }
                 }
         
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/Version1/Collections.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/Version1/Collections.generated.txt
index 7ff43631ba430d..668cbc6f836bd0 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/Version1/Collections.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/Version1/Collections.generated.txt
@@ -41,7 +41,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
         #endregion IConfiguration extensions.
 
         #region Core binding extensions.
-        private readonly static Lazy<HashSet<string>> s_configKeys_Program__MyClassWithCustomCollections = new(() => new HashSet<string>(StringComparer.OrdinalIgnoreCase) { "CustomDictionary", "CustomList", "ICustomDictionary", "ICustomCollection", "IReadOnlyList", "UnsupportedIReadOnlyDictionaryUnsupported", "IReadOnlyDictionary", "CollectionStructExplicit" });
+        private readonly static Lazy<global::System.Collections.Generic.HashSet<string>> s_configKeys_Program__MyClassWithCustomCollections = new(() => new global::System.Collections.Generic.HashSet<string>(StringComparer.OrdinalIgnoreCase) { "CustomDictionary", "CustomList", "ICustomDictionary", "ICustomCollection", "IReadOnlyList", "UnsupportedIReadOnlyDictionaryUnsupported", "IReadOnlyDictionary", "CollectionStructExplicit" });
 
         public static object? GetCore(this IConfiguration configuration, Type type, Action<BinderOptions>? configureOptions)
         {
@@ -94,7 +94,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
         public static void BindCore(IConfiguration configuration, ref global::System.Collections.Generic.IReadOnlyList<int> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
-            if (instance is not ICollection<int> temp)
+            if (instance is not global::System.Collections.Generic.ICollection<int> temp)
             {
                 return;
             }
@@ -113,7 +113,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
         public static void BindCore(IConfiguration configuration, ref global::System.Collections.Generic.IReadOnlyDictionary<string, int> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
-            if (instance is not IDictionary<string, int> temp)
+            if (instance is not global::System.Collections.Generic.IDictionary<string, int> temp)
             {
                 return;
             }
@@ -177,7 +177,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             if (AsConfigWithChildren(value9) is IConfigurationSection section10)
             {
                 global::System.Collections.Generic.IReadOnlyList<int>? temp12 = instance.IReadOnlyList;
-                temp12 = temp12 is null ? (global::System.Collections.Generic.IReadOnlyList<int>)new List<int>() : (global::System.Collections.Generic.IReadOnlyList<int>)new List<int>(temp12);
+                temp12 = temp12 is null ? (global::System.Collections.Generic.IReadOnlyList<int>)new global::System.Collections.Generic.List<int>() : (global::System.Collections.Generic.IReadOnlyList<int>)new global::System.Collections.Generic.List<int>(temp12);
                 BindCore(section10, ref temp12, defaultValueIfNotFound: false, binderOptions);
                 instance.IReadOnlyList = temp12;
             }
@@ -190,7 +190,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             if (AsConfigWithChildren(value13) is IConfigurationSection section14)
             {
                 global::System.Collections.Generic.IReadOnlyDictionary<string, int>? temp16 = instance.IReadOnlyDictionary;
-                temp16 = temp16 is null ? (global::System.Collections.Generic.IReadOnlyDictionary<string, int>)new Dictionary<string, int>() : (global::System.Collections.Generic.IReadOnlyDictionary<string, int>)temp16.ToDictionary(pair => pair.Key, pair => pair.Value);
+                temp16 = temp16 is null ? (global::System.Collections.Generic.IReadOnlyDictionary<string, int>)new global::System.Collections.Generic.Dictionary<string, int>() : (global::System.Collections.Generic.IReadOnlyDictionary<string, int>)temp16.ToDictionary(pair => pair.Key, pair => pair.Value);
                 BindCore(section14, ref temp16, defaultValueIfNotFound: false, binderOptions);
                 instance.IReadOnlyDictionary = temp16;
             }
@@ -228,17 +228,17 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
 
         /// <summary>If required by the binder options, validates that there are no unknown keys in the input configuration object.</summary>
-        public static void ValidateConfigurationKeys(Type type, Lazy<HashSet<string>> keys, IConfiguration configuration, BinderOptions? binderOptions)
+        public static void ValidateConfigurationKeys(Type type, Lazy<global::System.Collections.Generic.HashSet<string>> keys, IConfiguration configuration, BinderOptions? binderOptions)
         {
             if (binderOptions?.ErrorOnUnknownConfiguration is true)
             {
-                List<string>? temp = null;
+                global::System.Collections.Generic.List<string>? temp = null;
         
                 foreach (IConfigurationSection section in configuration.GetChildren())
                 {
                     if (!keys.Value.Contains(section.Key))
                     {
-                        (temp ??= new List<string>()).Add($"'{section.Key}'");
+                        (temp ??= new global::System.Collections.Generic.List<string>()).Add($"'{section.Key}'");
                     }
                 }
         
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/Version1/DefaultConstructorParameters.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/Version1/DefaultConstructorParameters.generated.txt
index 869cdd2bc10612..9ce7c5c2076008 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/Version1/DefaultConstructorParameters.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/Version1/DefaultConstructorParameters.generated.txt
@@ -54,7 +54,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
         #endregion IConfiguration extensions.
 
         #region Core binding extensions.
-        private readonly static Lazy<HashSet<string>> s_configKeys_Program__ClassWhereParametersHaveDefaultValue = new(() => new HashSet<string>(StringComparer.OrdinalIgnoreCase) { "Name", "Address", "Age", "F", "D", "M", "SC", "C", "NAge", "NF", "ND", "NM", "NSC", "NC" });
+        private readonly static Lazy<global::System.Collections.Generic.HashSet<string>> s_configKeys_Program__ClassWhereParametersHaveDefaultValue = new(() => new global::System.Collections.Generic.HashSet<string>(StringComparer.OrdinalIgnoreCase) { "Name", "Address", "Age", "F", "D", "M", "SC", "C", "NAge", "NF", "ND", "NM", "NSC", "NC" });
 
         public static void BindCore(IConfiguration configuration, ref global::Program.ClassWhereParametersHaveDefaultValue instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
@@ -242,17 +242,17 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
 
         /// <summary>If required by the binder options, validates that there are no unknown keys in the input configuration object.</summary>
-        public static void ValidateConfigurationKeys(Type type, Lazy<HashSet<string>> keys, IConfiguration configuration, BinderOptions? binderOptions)
+        public static void ValidateConfigurationKeys(Type type, Lazy<global::System.Collections.Generic.HashSet<string>> keys, IConfiguration configuration, BinderOptions? binderOptions)
         {
             if (binderOptions?.ErrorOnUnknownConfiguration is true)
             {
-                List<string>? temp = null;
+                global::System.Collections.Generic.List<string>? temp = null;
         
                 foreach (IConfigurationSection section in configuration.GetChildren())
                 {
                     if (!keys.Value.Contains(section.Key))
                     {
-                        (temp ??= new List<string>()).Add($"'{section.Key}'");
+                        (temp ??= new global::System.Collections.Generic.List<string>()).Add($"'{section.Key}'");
                     }
                 }
         
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/Version1/EmptyConfigType.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/Version1/EmptyConfigType.generated.txt
index 56e3b5dffb1b21..5a3d9373a5e849 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/Version1/EmptyConfigType.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/Version1/EmptyConfigType.generated.txt
@@ -61,7 +61,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
         #endregion IConfiguration extensions.
 
         #region Core binding extensions.
-        private readonly static Lazy<HashSet<string>> s_configKeys_TypeWithNoMembers_Wrapper = new(() => new HashSet<string>(StringComparer.OrdinalIgnoreCase) { "Member" });
+        private readonly static Lazy<global::System.Collections.Generic.HashSet<string>> s_configKeys_TypeWithNoMembers_Wrapper = new(() => new global::System.Collections.Generic.HashSet<string>(StringComparer.OrdinalIgnoreCase) { "Member" });
 
         public static void BindCore(IConfiguration configuration, ref global::TypeWithNoMembers_Wrapper instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
@@ -88,17 +88,17 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
 
         /// <summary>If required by the binder options, validates that there are no unknown keys in the input configuration object.</summary>
-        public static void ValidateConfigurationKeys(Type type, Lazy<HashSet<string>> keys, IConfiguration configuration, BinderOptions? binderOptions)
+        public static void ValidateConfigurationKeys(Type type, Lazy<global::System.Collections.Generic.HashSet<string>> keys, IConfiguration configuration, BinderOptions? binderOptions)
         {
             if (binderOptions?.ErrorOnUnknownConfiguration is true)
             {
-                List<string>? temp = null;
+                global::System.Collections.Generic.List<string>? temp = null;
         
                 foreach (IConfigurationSection section in configuration.GetChildren())
                 {
                     if (!keys.Value.Contains(section.Key))
                     {
-                        (temp ??= new List<string>()).Add($"'{section.Key}'");
+                        (temp ??= new global::System.Collections.Generic.List<string>()).Add($"'{section.Key}'");
                     }
                 }
         
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/Version1/Primitives.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/Version1/Primitives.generated.txt
index 0a5bfeaa6a1eab..c04c278e695ee9 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/Version1/Primitives.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/Version1/Primitives.generated.txt
@@ -54,7 +54,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
         #endregion IConfiguration extensions.
 
         #region Core binding extensions.
-        private readonly static Lazy<HashSet<string>> s_configKeys_Program__MyClass = new(() => new HashSet<string>(StringComparer.OrdinalIgnoreCase) { "Prop0", "Prop1", "Prop2", "Prop3", "Prop4", "Prop5", "Prop6", "Prop8", "Prop9", "Prop10", "Prop13", "Prop14", "Prop15", "Prop16", "Prop17", "Prop19", "Prop20", "Prop21", "Prop23", "Prop24", "Prop25", "Prop26", "Prop27", "Prop28", "Prop29", "Prop30" });
+        private readonly static Lazy<global::System.Collections.Generic.HashSet<string>> s_configKeys_Program__MyClass = new(() => new global::System.Collections.Generic.HashSet<string>(StringComparer.OrdinalIgnoreCase) { "Prop0", "Prop1", "Prop2", "Prop3", "Prop4", "Prop5", "Prop6", "Prop8", "Prop9", "Prop10", "Prop13", "Prop14", "Prop15", "Prop16", "Prop17", "Prop19", "Prop20", "Prop21", "Prop23", "Prop24", "Prop25", "Prop26", "Prop27", "Prop28", "Prop29", "Prop30" });
 
         public static void BindCore(IConfiguration configuration, ref global::Program.MyClass instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
@@ -437,17 +437,17 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
 
         /// <summary>If required by the binder options, validates that there are no unknown keys in the input configuration object.</summary>
-        public static void ValidateConfigurationKeys(Type type, Lazy<HashSet<string>> keys, IConfiguration configuration, BinderOptions? binderOptions)
+        public static void ValidateConfigurationKeys(Type type, Lazy<global::System.Collections.Generic.HashSet<string>> keys, IConfiguration configuration, BinderOptions? binderOptions)
         {
             if (binderOptions?.ErrorOnUnknownConfiguration is true)
             {
-                List<string>? temp = null;
+                global::System.Collections.Generic.List<string>? temp = null;
         
                 foreach (IConfigurationSection section in configuration.GetChildren())
                 {
                     if (!keys.Value.Contains(section.Key))
                     {
-                        (temp ??= new List<string>()).Add($"'{section.Key}'");
+                        (temp ??= new global::System.Collections.Generic.List<string>()).Add($"'{section.Key}'");
                     }
                 }
         
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/Version1/UnsupportedTypes.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/Version1/UnsupportedTypes.generated.txt
index f654bdd3d1b468..39b49f50deea16 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/Version1/UnsupportedTypes.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/net462/Version1/UnsupportedTypes.generated.txt
@@ -60,8 +60,8 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
         #endregion IConfiguration extensions.
 
         #region Core binding extensions.
-        private readonly static Lazy<HashSet<string>> s_configKeys_Record___System__Action___ = new(() => new HashSet<string>(StringComparer.OrdinalIgnoreCase) { "x" });
-        private readonly static Lazy<HashSet<string>> s_configKeys_Options = new(() => new HashSet<string>(StringComparer.OrdinalIgnoreCase) { "Name", "Age", "List", "Array", "Record" });
+        private readonly static Lazy<global::System.Collections.Generic.HashSet<string>> s_configKeys_Record___System__Action___ = new(() => new global::System.Collections.Generic.HashSet<string>(StringComparer.OrdinalIgnoreCase) { "x" });
+        private readonly static Lazy<global::System.Collections.Generic.HashSet<string>> s_configKeys_Options = new(() => new global::System.Collections.Generic.HashSet<string>(StringComparer.OrdinalIgnoreCase) { "Name", "Age", "List", "Array", "Record" });
 
         public static object? GetCore(this IConfiguration configuration, Type type, Action<BinderOptions>? configureOptions)
         {
@@ -230,17 +230,17 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
 
         /// <summary>If required by the binder options, validates that there are no unknown keys in the input configuration object.</summary>
-        public static void ValidateConfigurationKeys(Type type, Lazy<HashSet<string>> keys, IConfiguration configuration, BinderOptions? binderOptions)
+        public static void ValidateConfigurationKeys(Type type, Lazy<global::System.Collections.Generic.HashSet<string>> keys, IConfiguration configuration, BinderOptions? binderOptions)
         {
             if (binderOptions?.ErrorOnUnknownConfiguration is true)
             {
-                List<string>? temp = null;
+                global::System.Collections.Generic.List<string>? temp = null;
         
                 foreach (IConfigurationSection section in configuration.GetChildren())
                 {
                     if (!keys.Value.Contains(section.Key))
                     {
-                        (temp ??= new List<string>()).Add($"'{section.Key}'");
+                        (temp ??= new global::System.Collections.Generic.List<string>()).Add($"'{section.Key}'");
                     }
                 }
         
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/Version1/Bind.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/Version1/Bind.generated.txt
index 790474dbfc1dd6..7f4fd63b274009 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/Version1/Bind.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/Version1/Bind.generated.txt
@@ -81,7 +81,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
         #endregion IConfiguration extensions.
 
         #region Core binding extensions.
-        private readonly static Lazy<HashSet<string>> s_configKeys_Program__MyClass = new(() => new HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyString", "MyInt", "MyList", "MyDictionary", "MyComplexDictionary" });
+        private readonly static Lazy<global::System.Collections.Generic.HashSet<string>> s_configKeys_Program__MyClass = new(() => new global::System.Collections.Generic.HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyString", "MyInt", "MyList", "MyDictionary", "MyComplexDictionary" });
 
         public static void BindCore(IConfiguration configuration, ref global::System.Collections.Generic.List<int> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
@@ -203,17 +203,17 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
 
         /// <summary>If required by the binder options, validates that there are no unknown keys in the input configuration object.</summary>
-        public static void ValidateConfigurationKeys(Type type, Lazy<HashSet<string>> keys, IConfiguration configuration, BinderOptions? binderOptions)
+        public static void ValidateConfigurationKeys(Type type, Lazy<global::System.Collections.Generic.HashSet<string>> keys, IConfiguration configuration, BinderOptions? binderOptions)
         {
             if (binderOptions?.ErrorOnUnknownConfiguration is true)
             {
-                List<string>? temp = null;
+                global::System.Collections.Generic.List<string>? temp = null;
         
                 foreach (IConfigurationSection section in configuration.GetChildren())
                 {
                     if (!keys.Value.Contains(section.Key))
                     {
-                        (temp ??= new List<string>()).Add($"'{section.Key}'");
+                        (temp ??= new global::System.Collections.Generic.List<string>()).Add($"'{section.Key}'");
                     }
                 }
         
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/Version1/Bind_Instance.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/Version1/Bind_Instance.generated.txt
index 402443ec1d66b2..60a5eb1103e120 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/Version1/Bind_Instance.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/Version1/Bind_Instance.generated.txt
@@ -51,7 +51,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
         #endregion IConfiguration extensions.
 
         #region Core binding extensions.
-        private readonly static Lazy<HashSet<string>> s_configKeys_Program__MyClass = new(() => new HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyString", "MyInt", "MyList", "MyDictionary", "MyComplexDictionary" });
+        private readonly static Lazy<global::System.Collections.Generic.HashSet<string>> s_configKeys_Program__MyClass = new(() => new global::System.Collections.Generic.HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyString", "MyInt", "MyList", "MyDictionary", "MyComplexDictionary" });
 
         public static void BindCore(IConfiguration configuration, ref global::System.Collections.Generic.List<int> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
@@ -173,17 +173,17 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
 
         /// <summary>If required by the binder options, validates that there are no unknown keys in the input configuration object.</summary>
-        public static void ValidateConfigurationKeys(Type type, Lazy<HashSet<string>> keys, IConfiguration configuration, BinderOptions? binderOptions)
+        public static void ValidateConfigurationKeys(Type type, Lazy<global::System.Collections.Generic.HashSet<string>> keys, IConfiguration configuration, BinderOptions? binderOptions)
         {
             if (binderOptions?.ErrorOnUnknownConfiguration is true)
             {
-                List<string>? temp = null;
+                global::System.Collections.Generic.List<string>? temp = null;
         
                 foreach (IConfigurationSection section in configuration.GetChildren())
                 {
                     if (!keys.Value.Contains(section.Key))
                     {
-                        (temp ??= new List<string>()).Add($"'{section.Key}'");
+                        (temp ??= new global::System.Collections.Generic.List<string>()).Add($"'{section.Key}'");
                     }
                 }
         
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/Version1/Bind_Instance_BinderOptions.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/Version1/Bind_Instance_BinderOptions.generated.txt
index 613c71fc65c901..fcd3c5465d9021 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/Version1/Bind_Instance_BinderOptions.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/Version1/Bind_Instance_BinderOptions.generated.txt
@@ -51,7 +51,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
         #endregion IConfiguration extensions.
 
         #region Core binding extensions.
-        private readonly static Lazy<HashSet<string>> s_configKeys_Program__MyClass = new(() => new HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyString", "MyInt", "MyList", "MyDictionary", "MyComplexDictionary" });
+        private readonly static Lazy<global::System.Collections.Generic.HashSet<string>> s_configKeys_Program__MyClass = new(() => new global::System.Collections.Generic.HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyString", "MyInt", "MyList", "MyDictionary", "MyComplexDictionary" });
 
         public static void BindCore(IConfiguration configuration, ref global::System.Collections.Generic.List<int> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
@@ -173,17 +173,17 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
 
         /// <summary>If required by the binder options, validates that there are no unknown keys in the input configuration object.</summary>
-        public static void ValidateConfigurationKeys(Type type, Lazy<HashSet<string>> keys, IConfiguration configuration, BinderOptions? binderOptions)
+        public static void ValidateConfigurationKeys(Type type, Lazy<global::System.Collections.Generic.HashSet<string>> keys, IConfiguration configuration, BinderOptions? binderOptions)
         {
             if (binderOptions?.ErrorOnUnknownConfiguration is true)
             {
-                List<string>? temp = null;
+                global::System.Collections.Generic.List<string>? temp = null;
         
                 foreach (IConfigurationSection section in configuration.GetChildren())
                 {
                     if (!keys.Value.Contains(section.Key))
                     {
-                        (temp ??= new List<string>()).Add($"'{section.Key}'");
+                        (temp ??= new global::System.Collections.Generic.List<string>()).Add($"'{section.Key}'");
                     }
                 }
         
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/Version1/Bind_Key_Instance.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/Version1/Bind_Key_Instance.generated.txt
index 0311e156bf301f..88c3f160a93ba6 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/Version1/Bind_Key_Instance.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/Version1/Bind_Key_Instance.generated.txt
@@ -51,7 +51,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
         #endregion IConfiguration extensions.
 
         #region Core binding extensions.
-        private readonly static Lazy<HashSet<string>> s_configKeys_Program__MyClass = new(() => new HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyString", "MyInt", "MyList", "MyDictionary", "MyComplexDictionary" });
+        private readonly static Lazy<global::System.Collections.Generic.HashSet<string>> s_configKeys_Program__MyClass = new(() => new global::System.Collections.Generic.HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyString", "MyInt", "MyList", "MyDictionary", "MyComplexDictionary" });
 
         public static void BindCore(IConfiguration configuration, ref global::System.Collections.Generic.List<int> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
@@ -173,17 +173,17 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
 
         /// <summary>If required by the binder options, validates that there are no unknown keys in the input configuration object.</summary>
-        public static void ValidateConfigurationKeys(Type type, Lazy<HashSet<string>> keys, IConfiguration configuration, BinderOptions? binderOptions)
+        public static void ValidateConfigurationKeys(Type type, Lazy<global::System.Collections.Generic.HashSet<string>> keys, IConfiguration configuration, BinderOptions? binderOptions)
         {
             if (binderOptions?.ErrorOnUnknownConfiguration is true)
             {
-                List<string>? temp = null;
+                global::System.Collections.Generic.List<string>? temp = null;
         
                 foreach (IConfigurationSection section in configuration.GetChildren())
                 {
                     if (!keys.Value.Contains(section.Key))
                     {
-                        (temp ??= new List<string>()).Add($"'{section.Key}'");
+                        (temp ??= new global::System.Collections.Generic.List<string>()).Add($"'{section.Key}'");
                     }
                 }
         
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/Version1/Get.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/Version1/Get.generated.txt
index 85cf5811d9c82a..99e17ad2ff8418 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/Version1/Get.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/Version1/Get.generated.txt
@@ -52,8 +52,8 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
         #endregion IConfiguration extensions.
 
         #region Core binding extensions.
-        private readonly static Lazy<HashSet<string>> s_configKeys_Program__MyClass = new(() => new HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyString", "MyInt", "MyList", "MyArray", "MyDictionary" });
-        private readonly static Lazy<HashSet<string>> s_configKeys_Program__MyClass2 = new(() => new HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyInt" });
+        private readonly static Lazy<global::System.Collections.Generic.HashSet<string>> s_configKeys_Program__MyClass = new(() => new global::System.Collections.Generic.HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyString", "MyInt", "MyList", "MyArray", "MyDictionary" });
+        private readonly static Lazy<global::System.Collections.Generic.HashSet<string>> s_configKeys_Program__MyClass2 = new(() => new global::System.Collections.Generic.HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyInt" });
 
         public static object? GetCore(this IConfiguration configuration, Type type, Action<BinderOptions>? configureOptions)
         {
@@ -231,17 +231,17 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
 
         /// <summary>If required by the binder options, validates that there are no unknown keys in the input configuration object.</summary>
-        public static void ValidateConfigurationKeys(Type type, Lazy<HashSet<string>> keys, IConfiguration configuration, BinderOptions? binderOptions)
+        public static void ValidateConfigurationKeys(Type type, Lazy<global::System.Collections.Generic.HashSet<string>> keys, IConfiguration configuration, BinderOptions? binderOptions)
         {
             if (binderOptions?.ErrorOnUnknownConfiguration is true)
             {
-                List<string>? temp = null;
+                global::System.Collections.Generic.List<string>? temp = null;
         
                 foreach (IConfigurationSection section in configuration.GetChildren())
                 {
                     if (!keys.Value.Contains(section.Key))
                     {
-                        (temp ??= new List<string>()).Add($"'{section.Key}'");
+                        (temp ??= new global::System.Collections.Generic.List<string>()).Add($"'{section.Key}'");
                     }
                 }
         
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/Version1/Get_T.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/Version1/Get_T.generated.txt
index 6b19b19d4105cf..437bce7d135008 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/Version1/Get_T.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/Version1/Get_T.generated.txt
@@ -40,7 +40,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
         #endregion IConfiguration extensions.
 
         #region Core binding extensions.
-        private readonly static Lazy<HashSet<string>> s_configKeys_Program__MyClass = new(() => new HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyString", "MyInt", "MyList", "MyArray", "MyDictionary" });
+        private readonly static Lazy<global::System.Collections.Generic.HashSet<string>> s_configKeys_Program__MyClass = new(() => new global::System.Collections.Generic.HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyString", "MyInt", "MyList", "MyArray", "MyDictionary" });
 
         public static object? GetCore(this IConfiguration configuration, Type type, Action<BinderOptions>? configureOptions)
         {
@@ -195,17 +195,17 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
 
         /// <summary>If required by the binder options, validates that there are no unknown keys in the input configuration object.</summary>
-        public static void ValidateConfigurationKeys(Type type, Lazy<HashSet<string>> keys, IConfiguration configuration, BinderOptions? binderOptions)
+        public static void ValidateConfigurationKeys(Type type, Lazy<global::System.Collections.Generic.HashSet<string>> keys, IConfiguration configuration, BinderOptions? binderOptions)
         {
             if (binderOptions?.ErrorOnUnknownConfiguration is true)
             {
-                List<string>? temp = null;
+                global::System.Collections.Generic.List<string>? temp = null;
         
                 foreach (IConfigurationSection section in configuration.GetChildren())
                 {
                     if (!keys.Value.Contains(section.Key))
                     {
-                        (temp ??= new List<string>()).Add($"'{section.Key}'");
+                        (temp ??= new global::System.Collections.Generic.List<string>()).Add($"'{section.Key}'");
                     }
                 }
         
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/Version1/Get_T_BinderOptions.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/Version1/Get_T_BinderOptions.generated.txt
index 875cf9916f18ac..654d5d65e0192b 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/Version1/Get_T_BinderOptions.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/Version1/Get_T_BinderOptions.generated.txt
@@ -40,7 +40,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
         #endregion IConfiguration extensions.
 
         #region Core binding extensions.
-        private readonly static Lazy<HashSet<string>> s_configKeys_Program__MyClass = new(() => new HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyString", "MyInt", "MyList", "MyArray", "MyDictionary" });
+        private readonly static Lazy<global::System.Collections.Generic.HashSet<string>> s_configKeys_Program__MyClass = new(() => new global::System.Collections.Generic.HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyString", "MyInt", "MyList", "MyArray", "MyDictionary" });
 
         public static object? GetCore(this IConfiguration configuration, Type type, Action<BinderOptions>? configureOptions)
         {
@@ -195,17 +195,17 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
 
         /// <summary>If required by the binder options, validates that there are no unknown keys in the input configuration object.</summary>
-        public static void ValidateConfigurationKeys(Type type, Lazy<HashSet<string>> keys, IConfiguration configuration, BinderOptions? binderOptions)
+        public static void ValidateConfigurationKeys(Type type, Lazy<global::System.Collections.Generic.HashSet<string>> keys, IConfiguration configuration, BinderOptions? binderOptions)
         {
             if (binderOptions?.ErrorOnUnknownConfiguration is true)
             {
-                List<string>? temp = null;
+                global::System.Collections.Generic.List<string>? temp = null;
         
                 foreach (IConfigurationSection section in configuration.GetChildren())
                 {
                     if (!keys.Value.Contains(section.Key))
                     {
-                        (temp ??= new List<string>()).Add($"'{section.Key}'");
+                        (temp ??= new global::System.Collections.Generic.List<string>()).Add($"'{section.Key}'");
                     }
                 }
         
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/Version1/Get_TypeOf.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/Version1/Get_TypeOf.generated.txt
index f921461fcfc74f..08b582ec3f93d9 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/Version1/Get_TypeOf.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/Version1/Get_TypeOf.generated.txt
@@ -40,7 +40,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
         #endregion IConfiguration extensions.
 
         #region Core binding extensions.
-        private readonly static Lazy<HashSet<string>> s_configKeys_Program__MyClass2 = new(() => new HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyInt" });
+        private readonly static Lazy<global::System.Collections.Generic.HashSet<string>> s_configKeys_Program__MyClass2 = new(() => new global::System.Collections.Generic.HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyInt" });
 
         public static object? GetCore(this IConfiguration configuration, Type type, Action<BinderOptions>? configureOptions)
         {
@@ -94,17 +94,17 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
 
         /// <summary>If required by the binder options, validates that there are no unknown keys in the input configuration object.</summary>
-        public static void ValidateConfigurationKeys(Type type, Lazy<HashSet<string>> keys, IConfiguration configuration, BinderOptions? binderOptions)
+        public static void ValidateConfigurationKeys(Type type, Lazy<global::System.Collections.Generic.HashSet<string>> keys, IConfiguration configuration, BinderOptions? binderOptions)
         {
             if (binderOptions?.ErrorOnUnknownConfiguration is true)
             {
-                List<string>? temp = null;
+                global::System.Collections.Generic.List<string>? temp = null;
         
                 foreach (IConfigurationSection section in configuration.GetChildren())
                 {
                     if (!keys.Value.Contains(section.Key))
                     {
-                        (temp ??= new List<string>()).Add($"'{section.Key}'");
+                        (temp ??= new global::System.Collections.Generic.List<string>()).Add($"'{section.Key}'");
                     }
                 }
         
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/Version1/Get_TypeOf_BinderOptions.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/Version1/Get_TypeOf_BinderOptions.generated.txt
index 3f89385e70f136..e7a5e8ac0194eb 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/Version1/Get_TypeOf_BinderOptions.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ConfigurationBinder/Version1/Get_TypeOf_BinderOptions.generated.txt
@@ -40,7 +40,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
         #endregion IConfiguration extensions.
 
         #region Core binding extensions.
-        private readonly static Lazy<HashSet<string>> s_configKeys_Program__MyClass2 = new(() => new HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyInt" });
+        private readonly static Lazy<global::System.Collections.Generic.HashSet<string>> s_configKeys_Program__MyClass2 = new(() => new global::System.Collections.Generic.HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyInt" });
 
         public static object? GetCore(this IConfiguration configuration, Type type, Action<BinderOptions>? configureOptions)
         {
@@ -94,17 +94,17 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
 
         /// <summary>If required by the binder options, validates that there are no unknown keys in the input configuration object.</summary>
-        public static void ValidateConfigurationKeys(Type type, Lazy<HashSet<string>> keys, IConfiguration configuration, BinderOptions? binderOptions)
+        public static void ValidateConfigurationKeys(Type type, Lazy<global::System.Collections.Generic.HashSet<string>> keys, IConfiguration configuration, BinderOptions? binderOptions)
         {
             if (binderOptions?.ErrorOnUnknownConfiguration is true)
             {
-                List<string>? temp = null;
+                global::System.Collections.Generic.List<string>? temp = null;
         
                 foreach (IConfigurationSection section in configuration.GetChildren())
                 {
                     if (!keys.Value.Contains(section.Key))
                     {
-                        (temp ??= new List<string>()).Add($"'{section.Key}'");
+                        (temp ??= new global::System.Collections.Generic.List<string>()).Add($"'{section.Key}'");
                     }
                 }
         
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/OptionsBuilder/Version1/BindConfiguration.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/OptionsBuilder/Version1/BindConfiguration.generated.txt
index 3f1dae70e25480..d66b850ec73a64 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/OptionsBuilder/Version1/BindConfiguration.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/OptionsBuilder/Version1/BindConfiguration.generated.txt
@@ -35,10 +35,10 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
     [GeneratedCode("Microsoft.Extensions.Configuration.Binder.SourceGeneration", "42.42.42.42")]
     file static class BindingExtensions
     {
-        #region OptionsBuilder<TOptions> extensions.
+        #region global::Microsoft.Extensions.Options.OptionsBuilder<TOptions> extensions.
         /// <summary>Registers the dependency injection container to bind <typeparamref name="TOptions"/> against the <see cref="IConfiguration"/> obtained from the DI service provider.</summary>
         [InterceptsLocation(1, "dQtLTBW+V+KExKSKfSGYWHgBAABzcmMtMC5jcw==")] // src-0.cs(12,24)
-        public static OptionsBuilder<TOptions> BindConfiguration<TOptions>(this OptionsBuilder<TOptions> optionsBuilder, string configSectionPath, Action<BinderOptions>? configureBinder = null) where TOptions : class
+        public static global::Microsoft.Extensions.Options.OptionsBuilder<TOptions> BindConfiguration<TOptions>(this global::Microsoft.Extensions.Options.OptionsBuilder<TOptions> optionsBuilder, string configSectionPath, Action<BinderOptions>? configureBinder = null) where TOptions : class
         {
             ArgumentNullException.ThrowIfNull(optionsBuilder);
 
@@ -59,10 +59,10 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
             return optionsBuilder;
         }
-        #endregion OptionsBuilder<TOptions> extensions.
+        #endregion global::Microsoft.Extensions.Options.OptionsBuilder<TOptions> extensions.
 
         #region Core binding extensions.
-        private readonly static Lazy<HashSet<string>> s_configKeys_Program__MyClass = new(() => new HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyString", "MyInt", "MyList" });
+        private readonly static Lazy<global::System.Collections.Generic.HashSet<string>> s_configKeys_Program__MyClass = new(() => new global::System.Collections.Generic.HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyString", "MyInt", "MyList" });
 
         public static void BindCoreMain(IConfiguration configuration, object instance, Type type, Action<BinderOptions>? configureOptions)
         {
@@ -159,17 +159,17 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
 
         /// <summary>If required by the binder options, validates that there are no unknown keys in the input configuration object.</summary>
-        public static void ValidateConfigurationKeys(Type type, Lazy<HashSet<string>> keys, IConfiguration configuration, BinderOptions? binderOptions)
+        public static void ValidateConfigurationKeys(Type type, Lazy<global::System.Collections.Generic.HashSet<string>> keys, IConfiguration configuration, BinderOptions? binderOptions)
         {
             if (binderOptions?.ErrorOnUnknownConfiguration is true)
             {
-                List<string>? temp = null;
+                global::System.Collections.Generic.List<string>? temp = null;
         
                 foreach (IConfigurationSection section in configuration.GetChildren())
                 {
                     if (!keys.Value.Contains(section.Key))
                     {
-                        (temp ??= new List<string>()).Add($"'{section.Key}'");
+                        (temp ??= new global::System.Collections.Generic.List<string>()).Add($"'{section.Key}'");
                     }
                 }
         
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/OptionsBuilder/Version1/BindConfigurationWithConfigureActions.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/OptionsBuilder/Version1/BindConfigurationWithConfigureActions.generated.txt
index 99bbd6f712f020..32ee775fe8bb0b 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/OptionsBuilder/Version1/BindConfigurationWithConfigureActions.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/OptionsBuilder/Version1/BindConfigurationWithConfigureActions.generated.txt
@@ -35,10 +35,10 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
     [GeneratedCode("Microsoft.Extensions.Configuration.Binder.SourceGeneration", "42.42.42.42")]
     file static class BindingExtensions
     {
-        #region OptionsBuilder<TOptions> extensions.
+        #region global::Microsoft.Extensions.Options.OptionsBuilder<TOptions> extensions.
         /// <summary>Registers the dependency injection container to bind <typeparamref name="TOptions"/> against the <see cref="IConfiguration"/> obtained from the DI service provider.</summary>
         [InterceptsLocation(1, "+juUY8RZzi0MOViHimSQBXgBAABzcmMtMC5jcw==")] // src-0.cs(12,24)
-        public static OptionsBuilder<TOptions> BindConfiguration<TOptions>(this OptionsBuilder<TOptions> optionsBuilder, string configSectionPath, Action<BinderOptions>? configureBinder = null) where TOptions : class
+        public static global::Microsoft.Extensions.Options.OptionsBuilder<TOptions> BindConfiguration<TOptions>(this global::Microsoft.Extensions.Options.OptionsBuilder<TOptions> optionsBuilder, string configSectionPath, Action<BinderOptions>? configureBinder = null) where TOptions : class
         {
             ArgumentNullException.ThrowIfNull(optionsBuilder);
 
@@ -59,10 +59,10 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
             return optionsBuilder;
         }
-        #endregion OptionsBuilder<TOptions> extensions.
+        #endregion global::Microsoft.Extensions.Options.OptionsBuilder<TOptions> extensions.
 
         #region Core binding extensions.
-        private readonly static Lazy<HashSet<string>> s_configKeys_Program__MyClass = new(() => new HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyString", "MyInt", "MyList" });
+        private readonly static Lazy<global::System.Collections.Generic.HashSet<string>> s_configKeys_Program__MyClass = new(() => new global::System.Collections.Generic.HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyString", "MyInt", "MyList" });
 
         public static void BindCoreMain(IConfiguration configuration, object instance, Type type, Action<BinderOptions>? configureOptions)
         {
@@ -159,17 +159,17 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
 
         /// <summary>If required by the binder options, validates that there are no unknown keys in the input configuration object.</summary>
-        public static void ValidateConfigurationKeys(Type type, Lazy<HashSet<string>> keys, IConfiguration configuration, BinderOptions? binderOptions)
+        public static void ValidateConfigurationKeys(Type type, Lazy<global::System.Collections.Generic.HashSet<string>> keys, IConfiguration configuration, BinderOptions? binderOptions)
         {
             if (binderOptions?.ErrorOnUnknownConfiguration is true)
             {
-                List<string>? temp = null;
+                global::System.Collections.Generic.List<string>? temp = null;
         
                 foreach (IConfigurationSection section in configuration.GetChildren())
                 {
                     if (!keys.Value.Contains(section.Key))
                     {
-                        (temp ??= new List<string>()).Add($"'{section.Key}'");
+                        (temp ??= new global::System.Collections.Generic.List<string>()).Add($"'{section.Key}'");
                     }
                 }
         
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/OptionsBuilder/Version1/Bind_T.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/OptionsBuilder/Version1/Bind_T.generated.txt
index bb0f5335de3ba6..c152aae35ed352 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/OptionsBuilder/Version1/Bind_T.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/OptionsBuilder/Version1/Bind_T.generated.txt
@@ -35,23 +35,23 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
     [GeneratedCode("Microsoft.Extensions.Configuration.Binder.SourceGeneration", "42.42.42.42")]
     file static class BindingExtensions
     {
-        #region OptionsBuilder<TOptions> extensions.
+        #region global::Microsoft.Extensions.Options.OptionsBuilder<TOptions> extensions.
         /// <summary>Registers a configuration instance which <typeparamref name="TOptions"/> will bind against.</summary>
         [InterceptsLocation(1, "/HkAEr/Ik8W47keDiXaNkeEBAABzcmMtMC5jcw==")] // src-0.cs(15,24)
-        public static OptionsBuilder<TOptions> Bind<TOptions>(this OptionsBuilder<TOptions> optionsBuilder, IConfiguration config) where TOptions : class
+        public static global::Microsoft.Extensions.Options.OptionsBuilder<TOptions> Bind<TOptions>(this global::Microsoft.Extensions.Options.OptionsBuilder<TOptions> optionsBuilder, IConfiguration config) where TOptions : class
         {
             return Bind(optionsBuilder, config, configureBinder: null);
         }
 
         /// <summary>Registers a configuration instance which <typeparamref name="TOptions"/> will bind against.</summary>
-        public static OptionsBuilder<TOptions> Bind<TOptions>(this OptionsBuilder<TOptions> optionsBuilder, IConfiguration config, Action<BinderOptions>? configureBinder) where TOptions : class
+        public static global::Microsoft.Extensions.Options.OptionsBuilder<TOptions> Bind<TOptions>(this global::Microsoft.Extensions.Options.OptionsBuilder<TOptions> optionsBuilder, IConfiguration config, Action<BinderOptions>? configureBinder) where TOptions : class
         {
             ArgumentNullException.ThrowIfNull(optionsBuilder);
 
             Configure<TOptions>(optionsBuilder.Services, optionsBuilder.Name, config, configureBinder);
             return optionsBuilder;
         }
-        #endregion OptionsBuilder<TOptions> extensions.
+        #endregion global::Microsoft.Extensions.Options.OptionsBuilder<TOptions> extensions.
 
         #region IServiceCollection extensions.
         /// <summary>Registers a configuration instance which TOptions will bind against.</summary>
@@ -68,7 +68,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
         #endregion IServiceCollection extensions.
 
         #region Core binding extensions.
-        private readonly static Lazy<HashSet<string>> s_configKeys_Program__MyClass = new(() => new HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyString", "MyInt", "MyList" });
+        private readonly static Lazy<global::System.Collections.Generic.HashSet<string>> s_configKeys_Program__MyClass = new(() => new global::System.Collections.Generic.HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyString", "MyInt", "MyList" });
 
         public static void BindCoreMain(IConfiguration configuration, object instance, Type type, Action<BinderOptions>? configureOptions)
         {
@@ -165,17 +165,17 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
 
         /// <summary>If required by the binder options, validates that there are no unknown keys in the input configuration object.</summary>
-        public static void ValidateConfigurationKeys(Type type, Lazy<HashSet<string>> keys, IConfiguration configuration, BinderOptions? binderOptions)
+        public static void ValidateConfigurationKeys(Type type, Lazy<global::System.Collections.Generic.HashSet<string>> keys, IConfiguration configuration, BinderOptions? binderOptions)
         {
             if (binderOptions?.ErrorOnUnknownConfiguration is true)
             {
-                List<string>? temp = null;
+                global::System.Collections.Generic.List<string>? temp = null;
         
                 foreach (IConfigurationSection section in configuration.GetChildren())
                 {
                     if (!keys.Value.Contains(section.Key))
                     {
-                        (temp ??= new List<string>()).Add($"'{section.Key}'");
+                        (temp ??= new global::System.Collections.Generic.List<string>()).Add($"'{section.Key}'");
                     }
                 }
         
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/OptionsBuilder/Version1/Bind_T_BinderOptions.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/OptionsBuilder/Version1/Bind_T_BinderOptions.generated.txt
index b2c20c9474cd38..b6d2f75982baaf 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/OptionsBuilder/Version1/Bind_T_BinderOptions.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/OptionsBuilder/Version1/Bind_T_BinderOptions.generated.txt
@@ -35,17 +35,17 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
     [GeneratedCode("Microsoft.Extensions.Configuration.Binder.SourceGeneration", "42.42.42.42")]
     file static class BindingExtensions
     {
-        #region OptionsBuilder<TOptions> extensions.
+        #region global::Microsoft.Extensions.Options.OptionsBuilder<TOptions> extensions.
         /// <summary>Registers a configuration instance which <typeparamref name="TOptions"/> will bind against.</summary>
         [InterceptsLocation(1, "eAEQHTx/qUZMzyaWapEG3uEBAABzcmMtMC5jcw==")] // src-0.cs(15,24)
-        public static OptionsBuilder<TOptions> Bind<TOptions>(this OptionsBuilder<TOptions> optionsBuilder, IConfiguration config, Action<BinderOptions>? configureBinder) where TOptions : class
+        public static global::Microsoft.Extensions.Options.OptionsBuilder<TOptions> Bind<TOptions>(this global::Microsoft.Extensions.Options.OptionsBuilder<TOptions> optionsBuilder, IConfiguration config, Action<BinderOptions>? configureBinder) where TOptions : class
         {
             ArgumentNullException.ThrowIfNull(optionsBuilder);
 
             Configure<TOptions>(optionsBuilder.Services, optionsBuilder.Name, config, configureBinder);
             return optionsBuilder;
         }
-        #endregion OptionsBuilder<TOptions> extensions.
+        #endregion global::Microsoft.Extensions.Options.OptionsBuilder<TOptions> extensions.
 
         #region IServiceCollection extensions.
         /// <summary>Registers a configuration instance which TOptions will bind against.</summary>
@@ -62,7 +62,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
         #endregion IServiceCollection extensions.
 
         #region Core binding extensions.
-        private readonly static Lazy<HashSet<string>> s_configKeys_Program__MyClass = new(() => new HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyString", "MyInt", "MyList" });
+        private readonly static Lazy<global::System.Collections.Generic.HashSet<string>> s_configKeys_Program__MyClass = new(() => new global::System.Collections.Generic.HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyString", "MyInt", "MyList" });
 
         public static void BindCoreMain(IConfiguration configuration, object instance, Type type, Action<BinderOptions>? configureOptions)
         {
@@ -159,17 +159,17 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
 
         /// <summary>If required by the binder options, validates that there are no unknown keys in the input configuration object.</summary>
-        public static void ValidateConfigurationKeys(Type type, Lazy<HashSet<string>> keys, IConfiguration configuration, BinderOptions? binderOptions)
+        public static void ValidateConfigurationKeys(Type type, Lazy<global::System.Collections.Generic.HashSet<string>> keys, IConfiguration configuration, BinderOptions? binderOptions)
         {
             if (binderOptions?.ErrorOnUnknownConfiguration is true)
             {
-                List<string>? temp = null;
+                global::System.Collections.Generic.List<string>? temp = null;
         
                 foreach (IConfigurationSection section in configuration.GetChildren())
                 {
                     if (!keys.Value.Contains(section.Key))
                     {
-                        (temp ??= new List<string>()).Add($"'{section.Key}'");
+                        (temp ??= new global::System.Collections.Generic.List<string>()).Add($"'{section.Key}'");
                     }
                 }
         
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ServiceCollection/Version1/Configure_T.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ServiceCollection/Version1/Configure_T.generated.txt
index 4605c469ae68e4..d9645e2b579072 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ServiceCollection/Version1/Configure_T.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ServiceCollection/Version1/Configure_T.generated.txt
@@ -58,8 +58,8 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
         #endregion IServiceCollection extensions.
 
         #region Core binding extensions.
-        private readonly static Lazy<HashSet<string>> s_configKeys_Program__MyClass2 = new(() => new HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyInt" });
-        private readonly static Lazy<HashSet<string>> s_configKeys_Program__MyClass = new(() => new HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyString", "MyInt", "MyList", "MyList2", "MyDictionary" });
+        private readonly static Lazy<global::System.Collections.Generic.HashSet<string>> s_configKeys_Program__MyClass2 = new(() => new global::System.Collections.Generic.HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyInt" });
+        private readonly static Lazy<global::System.Collections.Generic.HashSet<string>> s_configKeys_Program__MyClass = new(() => new global::System.Collections.Generic.HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyString", "MyInt", "MyList", "MyList2", "MyDictionary" });
 
         public static void BindCoreMain(IConfiguration configuration, object instance, Type type, Action<BinderOptions>? configureOptions)
         {
@@ -224,17 +224,17 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
 
         /// <summary>If required by the binder options, validates that there are no unknown keys in the input configuration object.</summary>
-        public static void ValidateConfigurationKeys(Type type, Lazy<HashSet<string>> keys, IConfiguration configuration, BinderOptions? binderOptions)
+        public static void ValidateConfigurationKeys(Type type, Lazy<global::System.Collections.Generic.HashSet<string>> keys, IConfiguration configuration, BinderOptions? binderOptions)
         {
             if (binderOptions?.ErrorOnUnknownConfiguration is true)
             {
-                List<string>? temp = null;
+                global::System.Collections.Generic.List<string>? temp = null;
         
                 foreach (IConfigurationSection section in configuration.GetChildren())
                 {
                     if (!keys.Value.Contains(section.Key))
                     {
-                        (temp ??= new List<string>()).Add($"'{section.Key}'");
+                        (temp ??= new global::System.Collections.Generic.List<string>()).Add($"'{section.Key}'");
                     }
                 }
         
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ServiceCollection/Version1/Configure_T_BinderOptions.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ServiceCollection/Version1/Configure_T_BinderOptions.generated.txt
index 886cdf53adef48..065a4d45a779f2 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ServiceCollection/Version1/Configure_T_BinderOptions.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ServiceCollection/Version1/Configure_T_BinderOptions.generated.txt
@@ -58,8 +58,8 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
         #endregion IServiceCollection extensions.
 
         #region Core binding extensions.
-        private readonly static Lazy<HashSet<string>> s_configKeys_Program__MyClass2 = new(() => new HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyInt" });
-        private readonly static Lazy<HashSet<string>> s_configKeys_Program__MyClass = new(() => new HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyString", "MyInt", "MyList", "MyList2", "MyDictionary" });
+        private readonly static Lazy<global::System.Collections.Generic.HashSet<string>> s_configKeys_Program__MyClass2 = new(() => new global::System.Collections.Generic.HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyInt" });
+        private readonly static Lazy<global::System.Collections.Generic.HashSet<string>> s_configKeys_Program__MyClass = new(() => new global::System.Collections.Generic.HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyString", "MyInt", "MyList", "MyList2", "MyDictionary" });
 
         public static void BindCoreMain(IConfiguration configuration, object instance, Type type, Action<BinderOptions>? configureOptions)
         {
@@ -224,17 +224,17 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
 
         /// <summary>If required by the binder options, validates that there are no unknown keys in the input configuration object.</summary>
-        public static void ValidateConfigurationKeys(Type type, Lazy<HashSet<string>> keys, IConfiguration configuration, BinderOptions? binderOptions)
+        public static void ValidateConfigurationKeys(Type type, Lazy<global::System.Collections.Generic.HashSet<string>> keys, IConfiguration configuration, BinderOptions? binderOptions)
         {
             if (binderOptions?.ErrorOnUnknownConfiguration is true)
             {
-                List<string>? temp = null;
+                global::System.Collections.Generic.List<string>? temp = null;
         
                 foreach (IConfigurationSection section in configuration.GetChildren())
                 {
                     if (!keys.Value.Contains(section.Key))
                     {
-                        (temp ??= new List<string>()).Add($"'{section.Key}'");
+                        (temp ??= new global::System.Collections.Generic.List<string>()).Add($"'{section.Key}'");
                     }
                 }
         
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ServiceCollection/Version1/Configure_T_name.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ServiceCollection/Version1/Configure_T_name.generated.txt
index 9a6acd00a7916c..eeafcceb582d8c 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ServiceCollection/Version1/Configure_T_name.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ServiceCollection/Version1/Configure_T_name.generated.txt
@@ -58,8 +58,8 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
         #endregion IServiceCollection extensions.
 
         #region Core binding extensions.
-        private readonly static Lazy<HashSet<string>> s_configKeys_Program__MyClass2 = new(() => new HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyInt" });
-        private readonly static Lazy<HashSet<string>> s_configKeys_Program__MyClass = new(() => new HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyString", "MyInt", "MyList", "MyList2", "MyDictionary" });
+        private readonly static Lazy<global::System.Collections.Generic.HashSet<string>> s_configKeys_Program__MyClass2 = new(() => new global::System.Collections.Generic.HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyInt" });
+        private readonly static Lazy<global::System.Collections.Generic.HashSet<string>> s_configKeys_Program__MyClass = new(() => new global::System.Collections.Generic.HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyString", "MyInt", "MyList", "MyList2", "MyDictionary" });
 
         public static void BindCoreMain(IConfiguration configuration, object instance, Type type, Action<BinderOptions>? configureOptions)
         {
@@ -224,17 +224,17 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
 
         /// <summary>If required by the binder options, validates that there are no unknown keys in the input configuration object.</summary>
-        public static void ValidateConfigurationKeys(Type type, Lazy<HashSet<string>> keys, IConfiguration configuration, BinderOptions? binderOptions)
+        public static void ValidateConfigurationKeys(Type type, Lazy<global::System.Collections.Generic.HashSet<string>> keys, IConfiguration configuration, BinderOptions? binderOptions)
         {
             if (binderOptions?.ErrorOnUnknownConfiguration is true)
             {
-                List<string>? temp = null;
+                global::System.Collections.Generic.List<string>? temp = null;
         
                 foreach (IConfigurationSection section in configuration.GetChildren())
                 {
                     if (!keys.Value.Contains(section.Key))
                     {
-                        (temp ??= new List<string>()).Add($"'{section.Key}'");
+                        (temp ??= new global::System.Collections.Generic.List<string>()).Add($"'{section.Key}'");
                     }
                 }
         
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ServiceCollection/Version1/Configure_T_name_BinderOptions.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ServiceCollection/Version1/Configure_T_name_BinderOptions.generated.txt
index 972d7f9e02bda0..6bcaeac55f93a6 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ServiceCollection/Version1/Configure_T_name_BinderOptions.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/ServiceCollection/Version1/Configure_T_name_BinderOptions.generated.txt
@@ -52,8 +52,8 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
         #endregion IServiceCollection extensions.
 
         #region Core binding extensions.
-        private readonly static Lazy<HashSet<string>> s_configKeys_Program__MyClass2 = new(() => new HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyInt" });
-        private readonly static Lazy<HashSet<string>> s_configKeys_Program__MyClass = new(() => new HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyString", "MyInt", "MyList", "MyList2", "MyDictionary" });
+        private readonly static Lazy<global::System.Collections.Generic.HashSet<string>> s_configKeys_Program__MyClass2 = new(() => new global::System.Collections.Generic.HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyInt" });
+        private readonly static Lazy<global::System.Collections.Generic.HashSet<string>> s_configKeys_Program__MyClass = new(() => new global::System.Collections.Generic.HashSet<string>(StringComparer.OrdinalIgnoreCase) { "MyString", "MyInt", "MyList", "MyList2", "MyDictionary" });
 
         public static void BindCoreMain(IConfiguration configuration, object instance, Type type, Action<BinderOptions>? configureOptions)
         {
@@ -218,17 +218,17 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
 
         /// <summary>If required by the binder options, validates that there are no unknown keys in the input configuration object.</summary>
-        public static void ValidateConfigurationKeys(Type type, Lazy<HashSet<string>> keys, IConfiguration configuration, BinderOptions? binderOptions)
+        public static void ValidateConfigurationKeys(Type type, Lazy<global::System.Collections.Generic.HashSet<string>> keys, IConfiguration configuration, BinderOptions? binderOptions)
         {
             if (binderOptions?.ErrorOnUnknownConfiguration is true)
             {
-                List<string>? temp = null;
+                global::System.Collections.Generic.List<string>? temp = null;
         
                 foreach (IConfigurationSection section in configuration.GetChildren())
                 {
                     if (!keys.Value.Contains(section.Key))
                     {
-                        (temp ??= new List<string>()).Add($"'{section.Key}'");
+                        (temp ??= new global::System.Collections.Generic.List<string>()).Add($"'{section.Key}'");
                     }
                 }
         
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/Version1/Collections.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/Version1/Collections.generated.txt
index 3cb2bbb2134ec6..5de3a0ef86dd9d 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/Version1/Collections.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/Version1/Collections.generated.txt
@@ -41,7 +41,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
         #endregion IConfiguration extensions.
 
         #region Core binding extensions.
-        private readonly static Lazy<HashSet<string>> s_configKeys_Program__MyClassWithCustomCollections = new(() => new HashSet<string>(StringComparer.OrdinalIgnoreCase) { "CustomDictionary", "CustomList", "ICustomDictionary", "ICustomCollection", "IReadOnlyList", "UnsupportedIReadOnlyDictionaryUnsupported", "IReadOnlyDictionary", "CollectionStructExplicit" });
+        private readonly static Lazy<global::System.Collections.Generic.HashSet<string>> s_configKeys_Program__MyClassWithCustomCollections = new(() => new global::System.Collections.Generic.HashSet<string>(StringComparer.OrdinalIgnoreCase) { "CustomDictionary", "CustomList", "ICustomDictionary", "ICustomCollection", "IReadOnlyList", "UnsupportedIReadOnlyDictionaryUnsupported", "IReadOnlyDictionary", "CollectionStructExplicit" });
 
         public static object? GetCore(this IConfiguration configuration, Type type, Action<BinderOptions>? configureOptions)
         {
@@ -91,7 +91,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
         public static void BindCore(IConfiguration configuration, ref global::System.Collections.Generic.IReadOnlyList<int> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
-            if (instance is not ICollection<int> temp)
+            if (instance is not global::System.Collections.Generic.ICollection<int> temp)
             {
                 return;
             }
@@ -110,7 +110,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
         public static void BindCore(IConfiguration configuration, ref global::System.Collections.Generic.IReadOnlyDictionary<string, int> instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
-            if (instance is not IDictionary<string, int> temp)
+            if (instance is not global::System.Collections.Generic.IDictionary<string, int> temp)
             {
                 return;
             }
@@ -174,7 +174,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             if (AsConfigWithChildren(value9) is IConfigurationSection section10)
             {
                 global::System.Collections.Generic.IReadOnlyList<int>? temp12 = instance.IReadOnlyList;
-                temp12 = temp12 is null ? (global::System.Collections.Generic.IReadOnlyList<int>)new List<int>() : (global::System.Collections.Generic.IReadOnlyList<int>)new List<int>(temp12);
+                temp12 = temp12 is null ? (global::System.Collections.Generic.IReadOnlyList<int>)new global::System.Collections.Generic.List<int>() : (global::System.Collections.Generic.IReadOnlyList<int>)new global::System.Collections.Generic.List<int>(temp12);
                 BindCore(section10, ref temp12, defaultValueIfNotFound: false, binderOptions);
                 instance.IReadOnlyList = temp12;
             }
@@ -187,7 +187,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
             if (AsConfigWithChildren(value13) is IConfigurationSection section14)
             {
                 global::System.Collections.Generic.IReadOnlyDictionary<string, int>? temp16 = instance.IReadOnlyDictionary;
-                temp16 = temp16 is null ? (global::System.Collections.Generic.IReadOnlyDictionary<string, int>)new Dictionary<string, int>() : (global::System.Collections.Generic.IReadOnlyDictionary<string, int>)temp16.ToDictionary(pair => pair.Key, pair => pair.Value);
+                temp16 = temp16 is null ? (global::System.Collections.Generic.IReadOnlyDictionary<string, int>)new global::System.Collections.Generic.Dictionary<string, int>() : (global::System.Collections.Generic.IReadOnlyDictionary<string, int>)temp16.ToDictionary(pair => pair.Key, pair => pair.Value);
                 BindCore(section14, ref temp16, defaultValueIfNotFound: false, binderOptions);
                 instance.IReadOnlyDictionary = temp16;
             }
@@ -225,17 +225,17 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
 
         /// <summary>If required by the binder options, validates that there are no unknown keys in the input configuration object.</summary>
-        public static void ValidateConfigurationKeys(Type type, Lazy<HashSet<string>> keys, IConfiguration configuration, BinderOptions? binderOptions)
+        public static void ValidateConfigurationKeys(Type type, Lazy<global::System.Collections.Generic.HashSet<string>> keys, IConfiguration configuration, BinderOptions? binderOptions)
         {
             if (binderOptions?.ErrorOnUnknownConfiguration is true)
             {
-                List<string>? temp = null;
+                global::System.Collections.Generic.List<string>? temp = null;
         
                 foreach (IConfigurationSection section in configuration.GetChildren())
                 {
                     if (!keys.Value.Contains(section.Key))
                     {
-                        (temp ??= new List<string>()).Add($"'{section.Key}'");
+                        (temp ??= new global::System.Collections.Generic.List<string>()).Add($"'{section.Key}'");
                     }
                 }
         
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/Version1/DefaultConstructorParameters.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/Version1/DefaultConstructorParameters.generated.txt
index 2f93b0d8e1451a..eeb157b6c76622 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/Version1/DefaultConstructorParameters.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/Version1/DefaultConstructorParameters.generated.txt
@@ -51,7 +51,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
         #endregion IConfiguration extensions.
 
         #region Core binding extensions.
-        private readonly static Lazy<HashSet<string>> s_configKeys_Program__ClassWhereParametersHaveDefaultValue = new(() => new HashSet<string>(StringComparer.OrdinalIgnoreCase) { "Name", "Address", "Age", "F", "D", "M", "SC", "C", "NAge", "NF", "ND", "NM", "NSC", "NC" });
+        private readonly static Lazy<global::System.Collections.Generic.HashSet<string>> s_configKeys_Program__ClassWhereParametersHaveDefaultValue = new(() => new global::System.Collections.Generic.HashSet<string>(StringComparer.OrdinalIgnoreCase) { "Name", "Address", "Age", "F", "D", "M", "SC", "C", "NAge", "NF", "ND", "NM", "NSC", "NC" });
 
         public static void BindCore(IConfiguration configuration, ref global::Program.ClassWhereParametersHaveDefaultValue instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
@@ -239,17 +239,17 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
 
         /// <summary>If required by the binder options, validates that there are no unknown keys in the input configuration object.</summary>
-        public static void ValidateConfigurationKeys(Type type, Lazy<HashSet<string>> keys, IConfiguration configuration, BinderOptions? binderOptions)
+        public static void ValidateConfigurationKeys(Type type, Lazy<global::System.Collections.Generic.HashSet<string>> keys, IConfiguration configuration, BinderOptions? binderOptions)
         {
             if (binderOptions?.ErrorOnUnknownConfiguration is true)
             {
-                List<string>? temp = null;
+                global::System.Collections.Generic.List<string>? temp = null;
         
                 foreach (IConfigurationSection section in configuration.GetChildren())
                 {
                     if (!keys.Value.Contains(section.Key))
                     {
-                        (temp ??= new List<string>()).Add($"'{section.Key}'");
+                        (temp ??= new global::System.Collections.Generic.List<string>()).Add($"'{section.Key}'");
                     }
                 }
         
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/Version1/EmptyConfigType.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/Version1/EmptyConfigType.generated.txt
index 03084d47bd9c25..7475df7afb33da 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/Version1/EmptyConfigType.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/Version1/EmptyConfigType.generated.txt
@@ -58,7 +58,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
         #endregion IConfiguration extensions.
 
         #region Core binding extensions.
-        private readonly static Lazy<HashSet<string>> s_configKeys_TypeWithNoMembers_Wrapper = new(() => new HashSet<string>(StringComparer.OrdinalIgnoreCase) { "Member" });
+        private readonly static Lazy<global::System.Collections.Generic.HashSet<string>> s_configKeys_TypeWithNoMembers_Wrapper = new(() => new global::System.Collections.Generic.HashSet<string>(StringComparer.OrdinalIgnoreCase) { "Member" });
 
         public static void BindCore(IConfiguration configuration, ref global::TypeWithNoMembers_Wrapper instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
@@ -85,17 +85,17 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
 
         /// <summary>If required by the binder options, validates that there are no unknown keys in the input configuration object.</summary>
-        public static void ValidateConfigurationKeys(Type type, Lazy<HashSet<string>> keys, IConfiguration configuration, BinderOptions? binderOptions)
+        public static void ValidateConfigurationKeys(Type type, Lazy<global::System.Collections.Generic.HashSet<string>> keys, IConfiguration configuration, BinderOptions? binderOptions)
         {
             if (binderOptions?.ErrorOnUnknownConfiguration is true)
             {
-                List<string>? temp = null;
+                global::System.Collections.Generic.List<string>? temp = null;
         
                 foreach (IConfigurationSection section in configuration.GetChildren())
                 {
                     if (!keys.Value.Contains(section.Key))
                     {
-                        (temp ??= new List<string>()).Add($"'{section.Key}'");
+                        (temp ??= new global::System.Collections.Generic.List<string>()).Add($"'{section.Key}'");
                     }
                 }
         
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/Version1/Primitives.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/Version1/Primitives.generated.txt
index 4678b0ed8ef89a..376e88d4635d13 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/Version1/Primitives.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/Version1/Primitives.generated.txt
@@ -51,7 +51,7 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
         #endregion IConfiguration extensions.
 
         #region Core binding extensions.
-        private readonly static Lazy<HashSet<string>> s_configKeys_Program__MyClass = new(() => new HashSet<string>(StringComparer.OrdinalIgnoreCase) { "Prop0", "Prop1", "Prop2", "Prop3", "Prop4", "Prop5", "Prop6", "Prop8", "Prop9", "Prop10", "Prop13", "Prop14", "Prop15", "Prop16", "Prop17", "Prop19", "Prop20", "Prop21", "Prop23", "Prop24", "Prop25", "Prop26", "Prop27", "Prop7", "Prop11", "Prop12", "Prop18", "Prop22", "Prop28", "Prop29", "Prop30" });
+        private readonly static Lazy<global::System.Collections.Generic.HashSet<string>> s_configKeys_Program__MyClass = new(() => new global::System.Collections.Generic.HashSet<string>(StringComparer.OrdinalIgnoreCase) { "Prop0", "Prop1", "Prop2", "Prop3", "Prop4", "Prop5", "Prop6", "Prop8", "Prop9", "Prop10", "Prop13", "Prop14", "Prop15", "Prop16", "Prop17", "Prop19", "Prop20", "Prop21", "Prop23", "Prop24", "Prop25", "Prop26", "Prop27", "Prop7", "Prop11", "Prop12", "Prop18", "Prop22", "Prop28", "Prop29", "Prop30" });
 
         public static void BindCore(IConfiguration configuration, ref global::Program.MyClass instance, bool defaultValueIfNotFound, BinderOptions? binderOptions)
         {
@@ -494,17 +494,17 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
 
         /// <summary>If required by the binder options, validates that there are no unknown keys in the input configuration object.</summary>
-        public static void ValidateConfigurationKeys(Type type, Lazy<HashSet<string>> keys, IConfiguration configuration, BinderOptions? binderOptions)
+        public static void ValidateConfigurationKeys(Type type, Lazy<global::System.Collections.Generic.HashSet<string>> keys, IConfiguration configuration, BinderOptions? binderOptions)
         {
             if (binderOptions?.ErrorOnUnknownConfiguration is true)
             {
-                List<string>? temp = null;
+                global::System.Collections.Generic.List<string>? temp = null;
         
                 foreach (IConfigurationSection section in configuration.GetChildren())
                 {
                     if (!keys.Value.Contains(section.Key))
                     {
-                        (temp ??= new List<string>()).Add($"'{section.Key}'");
+                        (temp ??= new global::System.Collections.Generic.List<string>()).Add($"'{section.Key}'");
                     }
                 }
         
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/Version1/UnsupportedTypes.generated.txt b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/Version1/UnsupportedTypes.generated.txt
index 588b203db49b98..52b7919f8fa19b 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/Version1/UnsupportedTypes.generated.txt
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/Baselines/netcoreapp/Version1/UnsupportedTypes.generated.txt
@@ -57,8 +57,8 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
         #endregion IConfiguration extensions.
 
         #region Core binding extensions.
-        private readonly static Lazy<HashSet<string>> s_configKeys_Record___System__Action___ = new(() => new HashSet<string>(StringComparer.OrdinalIgnoreCase) { "x" });
-        private readonly static Lazy<HashSet<string>> s_configKeys_Options = new(() => new HashSet<string>(StringComparer.OrdinalIgnoreCase) { "Name", "Age", "List", "Array", "Record" });
+        private readonly static Lazy<global::System.Collections.Generic.HashSet<string>> s_configKeys_Record___System__Action___ = new(() => new global::System.Collections.Generic.HashSet<string>(StringComparer.OrdinalIgnoreCase) { "x" });
+        private readonly static Lazy<global::System.Collections.Generic.HashSet<string>> s_configKeys_Options = new(() => new global::System.Collections.Generic.HashSet<string>(StringComparer.OrdinalIgnoreCase) { "Name", "Age", "List", "Array", "Record" });
 
         public static object? GetCore(this IConfiguration configuration, Type type, Action<BinderOptions>? configureOptions)
         {
@@ -224,17 +224,17 @@ namespace Microsoft.Extensions.Configuration.Binder.SourceGeneration
 
 
         /// <summary>If required by the binder options, validates that there are no unknown keys in the input configuration object.</summary>
-        public static void ValidateConfigurationKeys(Type type, Lazy<HashSet<string>> keys, IConfiguration configuration, BinderOptions? binderOptions)
+        public static void ValidateConfigurationKeys(Type type, Lazy<global::System.Collections.Generic.HashSet<string>> keys, IConfiguration configuration, BinderOptions? binderOptions)
         {
             if (binderOptions?.ErrorOnUnknownConfiguration is true)
             {
-                List<string>? temp = null;
+                global::System.Collections.Generic.List<string>? temp = null;
         
                 foreach (IConfigurationSection section in configuration.GetChildren())
                 {
                     if (!keys.Value.Contains(section.Key))
                     {
-                        (temp ??= new List<string>()).Add($"'{section.Key}'");
+                        (temp ??= new global::System.Collections.Generic.List<string>()).Add($"'{section.Key}'");
                     }
                 }
         
diff --git a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/GeneratorTests.cs b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/GeneratorTests.cs
index 00a038bdf5c8c8..7eee48fdeb28ca 100644
--- a/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/GeneratorTests.cs
+++ b/src/libraries/Microsoft.Extensions.Configuration.Binder/tests/SourceGenerationTests/GeneratorTests.cs
@@ -294,6 +294,38 @@ public class Settings
             Assert.NotNull(emittedAssemblyImage);
         }
 
+        [Fact]
+        public async Task BindingToCollectionOnlyTest()
+        {
+            string source = """
+                using Microsoft.Extensions.Configuration;
+                using System;
+                using System.Collections.Generic;
+
+                public class Program
+                {
+                    public static void Main()
+                    {
+                        ConfigurationBuilder configurationBuilder = new();
+                        IConfiguration config = configurationBuilder.Build();
+
+                        var settingsSection = config.GetSection("Settings");
+
+                        IDictionary<string, string> options = settingsSection.Get<IDictionary<string, string>>()!;
+                    }
+                }
+                """;
+
+            ConfigBindingGenRunResult result = await RunGeneratorAndUpdateCompilation(source, assemblyReferences: GetAssemblyRefsWithAdditional(typeof(ConfigurationBuilder), typeof(List<>)));
+            Assert.NotNull(result.GeneratedSource);
+            Assert.Empty(result.Diagnostics);
+
+            // Ensure the generated code can be compiled.
+            // If there is any compilation error, exception will be thrown with the list of the errors in the exception message.
+            byte[] emittedAssemblyImage = CreateAssemblyImage(result.OutputCompilation);
+            Assert.NotNull(emittedAssemblyImage);
+        }
+
         /// <summary>
         /// We binding the type "SslClientAuthenticationOptions" which has a property "CipherSuitesPolicy" of type "CipherSuitesPolicy". We can't bind this type.
         /// This test is to ensure not including the property "CipherSuitesPolicy" in the generated code caused a build break.