[X] Ignore Parent DataType on collection (#24530)

* [X] Ignore Parent DataType on collection

Picker.ItemDisplayBinding for example shouldn't inherit parent DataType

- fixes #23989

* fixtrimming

* suppresswarning

* Update src/TestUtils/src/Microsoft.Maui.IntegrationTests/Utilities/BuildWarningsUtilities.cs

Author: StephaneDelcroix

src/Controls/src/Xaml/XamlServiceProvider.cs

@@ -1,6 +1,8 @@
 using System;
 using System.Collections.Generic;
 using System.ComponentModel;
+using System.Diagnostics.CodeAnalysis;
+using System.Linq;
 using System.Reflection;
 using System.Xml;
 using Microsoft.Maui.Controls.Internals;
@@ -29,7 +31,7 @@ internal XamlServiceProvider(INode node, HydrationContext context)
 			IValueConverterProvider = new ValueConverterProvider();
 
 			if (node is IElementNode elementNode)
-				Add(typeof(IXamlDataTypeProvider), new XamlDataTypeProvider(elementNode));
+				Add(typeof(IXamlDataTypeProvider), new XamlDataTypeProvider(elementNode, context));
 		}
 
 		public XamlServiceProvider() => IValueConverterProvider = new ValueConverterProvider();
@@ -268,8 +270,15 @@ public string LookupNamespace(string prefix)
 
 	class XamlDataTypeProvider : IXamlDataTypeProvider
 	{
-		public XamlDataTypeProvider(IElementNode node)
+		[RequiresUnreferencedCode("XamlDataTypeProvider is not trim and AOT-compatible.")]
+#if !NETSTANDARD
+		[RequiresDynamicCode("XamlDataTypeProvider is not trim and AOT-compatible.")]
+#endif
+		public XamlDataTypeProvider(IElementNode node, HydrationContext context)
 		{
+			Context = context;
+			
+
 			static IElementNode GetParent(IElementNode node)
 			{
 				return node switch
@@ -289,6 +298,21 @@ static bool IsBindingContextBinding(IElementNode node)
 				return false;
 			}
 
+			static bool IsBindingBaseProperty(IElementNode node, HydrationContext context)
+			{
+				if (   ApplyPropertiesVisitor.TryGetPropertyName(node, node.Parent, out XmlName name)
+					&& node.Parent is IElementNode parent
+					&& XamlParser.GetElementType(parent.XmlType, 
+												 new XmlLineInfo(((IXmlLineInfo)node).LineNumber, ((IXmlLineInfo)node).LinePosition), 
+												 context.RootElement.GetType().Assembly, out var xpe) is Type parentType
+					&& parentType.GetRuntimeProperties().FirstOrDefault(p => p.Name == name.LocalName) is PropertyInfo propertyInfo
+					&& propertyInfo.PropertyType == typeof(BindingBase))
+				{								
+						return true;
+				}
+				return false;
+			}
+
 			INode dataTypeNode = null;
 			IElementNode n = node as IElementNode;
 
@@ -305,17 +329,21 @@ static bool IsBindingContextBinding(IElementNode node)
 
 			while (n != null)
 			{
+				
 				if (n != skipNode && n.Properties.TryGetValue(XmlName.xDataType, out dataTypeNode))
 				{
 					break;
 				}
-
+				if (IsBindingBaseProperty(n, context))
+				{					
+					break;
+				}
 				n = GetParent(n);
 			}
 			if (dataTypeNode is ValueNode valueNode)
 				BindingDataType = valueNode.Value as string;
-
 		}
 		public string BindingDataType { get; }
+		public HydrationContext Context { get; }
 	}
-}
+}

src/Controls/tests/Xaml.UnitTests/Controls.Xaml.UnitTests.csproj

@@ -6,7 +6,7 @@
     <AssemblyName>Microsoft.Maui.Controls.Xaml.UnitTests</AssemblyName>
     <WarningLevel>4</WarningLevel>
     <NoWarn>$(NoWarn);0672;0219;0414;CS0436;CS0618</NoWarn>
-    <WarningsNotAsErrors>$(WarningsNotAsErrors);XC0618;XC0022,XC0023</WarningsNotAsErrors>
+    <WarningsNotAsErrors>$(WarningsNotAsErrors);XC0618;XC0022;XC0023</WarningsNotAsErrors>
     <IsPackable>false</IsPackable>
     <DisableMSBuildAssemblyCopyCheck>true</DisableMSBuildAssemblyCopyCheck>
   </PropertyGroup>

src/TestUtils/src/Microsoft.Maui.IntegrationTests/Utilities/BuildWarningsUtilities.cs

@@ -454,6 +454,30 @@ public static void AssertWarnings(this List<WarningsPerFile> actualWarnings, Lis
 					},
 				}
 			},
+			new WarningsPerFile
+			{
+				File = "src/Controls/src/Xaml/XamlServiceProvider.cs",
+				WarningsPerCode = new List<WarningsPerCode>
+				{
+					new WarningsPerCode
+					{
+						Code = "IL2026",
+						Messages = new List<string>
+						{
+							"Microsoft.Maui.Controls.Xaml.Internals.XamlServiceProvider.XamlServiceProvider(INode,HydrationContext): Using member 'Microsoft.Maui.Controls.Xaml.Internals.XamlDataTypeProvider.XamlDataTypeProvider(IElementNode,HydrationContext)' which has 'RequiresUnreferencedCodeAttribute' can break functionality when trimming application code. XamlDataTypeProvider is not trim and AOT-compatible.",
+						}
+					},
+					new WarningsPerCode
+					{
+						Code = "IL3050",
+						Messages = new List<string>
+						{
+							"Microsoft.Maui.Controls.Xaml.Internals.XamlServiceProvider.XamlServiceProvider(INode,HydrationContext): Using member 'Microsoft.Maui.Controls.Xaml.Internals.XamlDataTypeProvider.XamlDataTypeProvider(IElementNode,HydrationContext)' which has 'RequiresDynamicCodeAttribute' can break functionality when AOT compiling. XamlDataTypeProvider is not trim and AOT-compatible.",
+						}
+					},
+					
+				}
+			},
 		};
 
 		#region Utility methods for generating the list of expected warnings