Add Json support (#791)

zzzprojects · Dec 7, 2024 · ded6619 · ded6619
1 parent 9d489d2
commit ded6619
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diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
@@ -85,6 +85,14 @@ jobs:
       run: |
         dotnet-coverage collect 'dotnet test ./test/System.Linq.Dynamic.Core.Tests.Net8/System.Linq.Dynamic.Core.Tests.Net8.csproj --configuration Debug --framework net8.0 -p:buildType=azure-pipelines-ci' -f xml -o dynamic-coverage-efcore.xml
         
+    - name: Run Tests Newtonsoft.Json .NET 8 (with Coverage)
+      run: |
+        dotnet-coverage collect 'dotnet test ./test/System.Linq.Dynamic.Core.NewtonsoftJson.Tests/System.Linq.Dynamic.Core.NewtonsoftJson.Tests.csproj --configuration Debug --framework net8.0 -p:buildType=azure-pipelines-ci' -f xml -o dynamic-coverage-newtonsoftjson.xml
+       
+    - name: Run Tests System.Text.Json .NET 8 (with Coverage)
+      run: |
+        dotnet-coverage collect 'dotnet test ./test/System.Linq.Dynamic.Core.SystemTextJson.Tests/System.Linq.Dynamic.Core.SystemTextJson.Tests.csproj --configuration Debug --framework net8.0 -p:buildType=azure-pipelines-ci' -f xml -o dynamic-coverage-systemtextjson.xml
+
     - name: End analysis on SonarCloud
       if: ${{ steps.secret-check.outputs.run_analysis == 'true' }}
       run: |

diff --git a/System.Linq.Dynamic.Core.sln b/System.Linq.Dynamic.Core.sln
@@ -143,6 +143,14 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Demo.Plugin", "src-console\
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "System.Linq.Dynamic.Core.Tests.NetCoreApp31", "test\System.Linq.Dynamic.Core.Tests.NetCoreApp31\System.Linq.Dynamic.Core.Tests.NetCoreApp31.csproj", "{7AFC2836-0F6E-4B0D-8BB3-13317A3B6616}"
 EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "System.Linq.Dynamic.Core.NewtonsoftJson", "src\System.Linq.Dynamic.Core.NewtonsoftJson\System.Linq.Dynamic.Core.NewtonsoftJson.csproj", "{8C5851B8-5C47-4229-AB55-D4252703598E}"
+EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "System.Linq.Dynamic.Core.NewtonsoftJson.Tests", "test\System.Linq.Dynamic.Core.NewtonsoftJson.Tests\System.Linq.Dynamic.Core.NewtonsoftJson.Tests.csproj", "{912FBF24-3CAE-4A50-B5EA-E525B9FAEC90}"
+EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "System.Linq.Dynamic.Core.SystemTextJson", "src\System.Linq.Dynamic.Core.SystemTextJson\System.Linq.Dynamic.Core.SystemTextJson.csproj", "{FA01CE15-315A-499E-AFC2-955CA7EB45FF}"
+EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "System.Linq.Dynamic.Core.SystemTextJson.Tests", "test\System.Linq.Dynamic.Core.SystemTextJson.Tests\System.Linq.Dynamic.Core.SystemTextJson.Tests.csproj", "{D5844AE4-53FA-4C8A-9D52-AD213FD0CA1E}"
+EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "WasmDynamicLinq", "src-blazor\WasmDynamicLinq\WasmDynamicLinq.csproj", "{2DE2052F-0A50-40C7-B6FF-52B52386BF9A}"
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "SldcTrimmer", "src-examples\SldcTrimmer\SldcTrimmer.csproj", "{7A31366C-DD98-41A3-A0C1-A97068BD9658}"
@@ -903,6 +911,70 @@ Global
 		{7AFC2836-0F6E-4B0D-8BB3-13317A3B6616}.Release|x64.Build.0 = Release|Any CPU
 		{7AFC2836-0F6E-4B0D-8BB3-13317A3B6616}.Release|x86.ActiveCfg = Release|Any CPU
 		{7AFC2836-0F6E-4B0D-8BB3-13317A3B6616}.Release|x86.Build.0 = Release|Any CPU
+		{8C5851B8-5C47-4229-AB55-D4252703598E}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{8C5851B8-5C47-4229-AB55-D4252703598E}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{8C5851B8-5C47-4229-AB55-D4252703598E}.Debug|ARM.ActiveCfg = Debug|Any CPU
+		{8C5851B8-5C47-4229-AB55-D4252703598E}.Debug|ARM.Build.0 = Debug|Any CPU
+		{8C5851B8-5C47-4229-AB55-D4252703598E}.Debug|x64.ActiveCfg = Debug|Any CPU
+		{8C5851B8-5C47-4229-AB55-D4252703598E}.Debug|x64.Build.0 = Debug|Any CPU
+		{8C5851B8-5C47-4229-AB55-D4252703598E}.Debug|x86.ActiveCfg = Debug|Any CPU
+		{8C5851B8-5C47-4229-AB55-D4252703598E}.Debug|x86.Build.0 = Debug|Any CPU
+		{8C5851B8-5C47-4229-AB55-D4252703598E}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{8C5851B8-5C47-4229-AB55-D4252703598E}.Release|Any CPU.Build.0 = Release|Any CPU
+		{8C5851B8-5C47-4229-AB55-D4252703598E}.Release|ARM.ActiveCfg = Release|Any CPU
+		{8C5851B8-5C47-4229-AB55-D4252703598E}.Release|ARM.Build.0 = Release|Any CPU
+		{8C5851B8-5C47-4229-AB55-D4252703598E}.Release|x64.ActiveCfg = Release|Any CPU
+		{8C5851B8-5C47-4229-AB55-D4252703598E}.Release|x64.Build.0 = Release|Any CPU
+		{8C5851B8-5C47-4229-AB55-D4252703598E}.Release|x86.ActiveCfg = Release|Any CPU
+		{8C5851B8-5C47-4229-AB55-D4252703598E}.Release|x86.Build.0 = Release|Any CPU
+		{912FBF24-3CAE-4A50-B5EA-E525B9FAEC90}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{912FBF24-3CAE-4A50-B5EA-E525B9FAEC90}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{912FBF24-3CAE-4A50-B5EA-E525B9FAEC90}.Debug|ARM.ActiveCfg = Debug|Any CPU
+		{912FBF24-3CAE-4A50-B5EA-E525B9FAEC90}.Debug|ARM.Build.0 = Debug|Any CPU
+		{912FBF24-3CAE-4A50-B5EA-E525B9FAEC90}.Debug|x64.ActiveCfg = Debug|Any CPU
+		{912FBF24-3CAE-4A50-B5EA-E525B9FAEC90}.Debug|x64.Build.0 = Debug|Any CPU
+		{912FBF24-3CAE-4A50-B5EA-E525B9FAEC90}.Debug|x86.ActiveCfg = Debug|Any CPU
+		{912FBF24-3CAE-4A50-B5EA-E525B9FAEC90}.Debug|x86.Build.0 = Debug|Any CPU
+		{912FBF24-3CAE-4A50-B5EA-E525B9FAEC90}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{912FBF24-3CAE-4A50-B5EA-E525B9FAEC90}.Release|Any CPU.Build.0 = Release|Any CPU
+		{912FBF24-3CAE-4A50-B5EA-E525B9FAEC90}.Release|ARM.ActiveCfg = Release|Any CPU
+		{912FBF24-3CAE-4A50-B5EA-E525B9FAEC90}.Release|ARM.Build.0 = Release|Any CPU
+		{912FBF24-3CAE-4A50-B5EA-E525B9FAEC90}.Release|x64.ActiveCfg = Release|Any CPU
+		{912FBF24-3CAE-4A50-B5EA-E525B9FAEC90}.Release|x64.Build.0 = Release|Any CPU
+		{912FBF24-3CAE-4A50-B5EA-E525B9FAEC90}.Release|x86.ActiveCfg = Release|Any CPU
+		{912FBF24-3CAE-4A50-B5EA-E525B9FAEC90}.Release|x86.Build.0 = Release|Any CPU
+		{FA01CE15-315A-499E-AFC2-955CA7EB45FF}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{FA01CE15-315A-499E-AFC2-955CA7EB45FF}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{FA01CE15-315A-499E-AFC2-955CA7EB45FF}.Debug|ARM.ActiveCfg = Debug|Any CPU
+		{FA01CE15-315A-499E-AFC2-955CA7EB45FF}.Debug|ARM.Build.0 = Debug|Any CPU
+		{FA01CE15-315A-499E-AFC2-955CA7EB45FF}.Debug|x64.ActiveCfg = Debug|Any CPU
+		{FA01CE15-315A-499E-AFC2-955CA7EB45FF}.Debug|x64.Build.0 = Debug|Any CPU
+		{FA01CE15-315A-499E-AFC2-955CA7EB45FF}.Debug|x86.ActiveCfg = Debug|Any CPU
+		{FA01CE15-315A-499E-AFC2-955CA7EB45FF}.Debug|x86.Build.0 = Debug|Any CPU
+		{FA01CE15-315A-499E-AFC2-955CA7EB45FF}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{FA01CE15-315A-499E-AFC2-955CA7EB45FF}.Release|Any CPU.Build.0 = Release|Any CPU
+		{FA01CE15-315A-499E-AFC2-955CA7EB45FF}.Release|ARM.ActiveCfg = Release|Any CPU
+		{FA01CE15-315A-499E-AFC2-955CA7EB45FF}.Release|ARM.Build.0 = Release|Any CPU
+		{FA01CE15-315A-499E-AFC2-955CA7EB45FF}.Release|x64.ActiveCfg = Release|Any CPU
+		{FA01CE15-315A-499E-AFC2-955CA7EB45FF}.Release|x64.Build.0 = Release|Any CPU
+		{FA01CE15-315A-499E-AFC2-955CA7EB45FF}.Release|x86.ActiveCfg = Release|Any CPU
+		{FA01CE15-315A-499E-AFC2-955CA7EB45FF}.Release|x86.Build.0 = Release|Any CPU
+		{D5844AE4-53FA-4C8A-9D52-AD213FD0CA1E}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{D5844AE4-53FA-4C8A-9D52-AD213FD0CA1E}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{D5844AE4-53FA-4C8A-9D52-AD213FD0CA1E}.Debug|ARM.ActiveCfg = Debug|Any CPU
+		{D5844AE4-53FA-4C8A-9D52-AD213FD0CA1E}.Debug|ARM.Build.0 = Debug|Any CPU
+		{D5844AE4-53FA-4C8A-9D52-AD213FD0CA1E}.Debug|x64.ActiveCfg = Debug|Any CPU
+		{D5844AE4-53FA-4C8A-9D52-AD213FD0CA1E}.Debug|x64.Build.0 = Debug|Any CPU
+		{D5844AE4-53FA-4C8A-9D52-AD213FD0CA1E}.Debug|x86.ActiveCfg = Debug|Any CPU
+		{D5844AE4-53FA-4C8A-9D52-AD213FD0CA1E}.Debug|x86.Build.0 = Debug|Any CPU
+		{D5844AE4-53FA-4C8A-9D52-AD213FD0CA1E}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{D5844AE4-53FA-4C8A-9D52-AD213FD0CA1E}.Release|Any CPU.Build.0 = Release|Any CPU
+		{D5844AE4-53FA-4C8A-9D52-AD213FD0CA1E}.Release|ARM.ActiveCfg = Release|Any CPU
+		{D5844AE4-53FA-4C8A-9D52-AD213FD0CA1E}.Release|ARM.Build.0 = Release|Any CPU
+		{D5844AE4-53FA-4C8A-9D52-AD213FD0CA1E}.Release|x64.ActiveCfg = Release|Any CPU
+		{D5844AE4-53FA-4C8A-9D52-AD213FD0CA1E}.Release|x64.Build.0 = Release|Any CPU
+		{D5844AE4-53FA-4C8A-9D52-AD213FD0CA1E}.Release|x86.ActiveCfg = Release|Any CPU
+		{D5844AE4-53FA-4C8A-9D52-AD213FD0CA1E}.Release|x86.Build.0 = Release|Any CPU
 		{2DE2052F-0A50-40C7-B6FF-52B52386BF9A}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
 		{2DE2052F-0A50-40C7-B6FF-52B52386BF9A}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{2DE2052F-0A50-40C7-B6FF-52B52386BF9A}.Debug|ARM.ActiveCfg = Debug|Any CPU
@@ -1018,6 +1090,10 @@ Global
 		{D8368319-F370-4071-9411-A3DADB234330} = {7971CAEB-B9F2-416B-966D-2D697C4C1E62}
 		{B01B327C-FC68-49B6-BDE3-A13D0C66DF5C} = {7971CAEB-B9F2-416B-966D-2D697C4C1E62}
 		{7AFC2836-0F6E-4B0D-8BB3-13317A3B6616} = {8463ED7E-69FB-49AE-85CF-0791AFD98E38}
+		{8C5851B8-5C47-4229-AB55-D4252703598E} = {DBD7D9B6-FCC7-4650-91AF-E6457573A68F}
+		{912FBF24-3CAE-4A50-B5EA-E525B9FAEC90} = {8463ED7E-69FB-49AE-85CF-0791AFD98E38}
+		{FA01CE15-315A-499E-AFC2-955CA7EB45FF} = {DBD7D9B6-FCC7-4650-91AF-E6457573A68F}
+		{D5844AE4-53FA-4C8A-9D52-AD213FD0CA1E} = {8463ED7E-69FB-49AE-85CF-0791AFD98E38}
 		{2DE2052F-0A50-40C7-B6FF-52B52386BF9A} = {122BC4FA-7563-4E35-9D17-077F16F1629F}
 		{7A31366C-DD98-41A3-A0C1-A97068BD9658} = {BCA2A024-9032-4E56-A6C4-17A15D921728}
 		{C774DAE7-54A0-4FCD-A3B7-3CB63D7E112D} = {DBD7D9B6-FCC7-4650-91AF-E6457573A68F}

diff --git a/src-console/ConsoleApp_net6.0/ConsoleApp_net6.0.csproj b/src-console/ConsoleApp_net6.0/ConsoleApp_net6.0.csproj
@@ -8,7 +8,8 @@
     </PropertyGroup>
 
     <ItemGroup>
-        <ProjectReference Include="..\..\src\System.Linq.Dynamic.Core\System.Linq.Dynamic.Core.csproj" />
+      <ProjectReference Include="..\..\src\System.Linq.Dynamic.Core.NewtonsoftJson\System.Linq.Dynamic.Core.NewtonsoftJson.csproj" />
+      <ProjectReference Include="..\..\src\System.Linq.Dynamic.Core.SystemTextJson\System.Linq.Dynamic.Core.SystemTextJson.csproj" />
     </ItemGroup>
 
 </Project>
diff --git a/src-console/ConsoleApp_net6.0/Program.cs b/src-console/ConsoleApp_net6.0/Program.cs
@@ -2,116 +2,185 @@
 using System.Collections.Generic;
 using System.Linq;
 using System.Linq.Dynamic.Core;
-using System.Linq.Dynamic.Core.Parser;
+using System.Linq.Dynamic.Core.NewtonsoftJson;
+using System.Linq.Dynamic.Core.SystemTextJson;
 using System.Linq.Expressions;
+using System.Text.Json;
+using Newtonsoft.Json.Linq;
 
-namespace ConsoleApp_net6._0
+namespace ConsoleApp_net6._0;
+
+public class X
 {
-    public class X
-    {
-        public string Key { get; set; } = null!;
+    public string Key { get; set; } = null!;
 
-        public List<Y>? Contestants { get; set; }
-    }
+    public List<Y>? Contestants { get; set; }
+}
 
-    public class Y
+public class Y
+{
+}
+
+class Program
+{
+    static void Main(string[] args)
     {
+        Json();
+        NewtonsoftJson();
+
+        return;
+
+        Issue389DoesNotWork();
+        return;
+        Issue389_Works();
+        return;
+
+        var q = new[]
+        {
+            new X { Key = "x" },
+            new X { Key = "a" },
+            new X { Key = "a", Contestants = new List<Y> { new Y() } }
+        }.AsQueryable();
+        var groupByKey = q.GroupBy("Key");
+        var selectQry = groupByKey.Select("new (Key, Sum(np(Contestants.Count, 0)) As TotalCount)").ToDynamicList();
+
+        Normal();
+        Dynamic();
     }
 
-    class Program
+    private static void NewtonsoftJson()
     {
-        static void Main(string[] args)
+        var array = JArray.Parse(@"[
         {
-            var parser = new ExpressionParser(new[] { Expression.Parameter(typeof(int), "VarA") }, "\"foo\" & VarA", new object[0], new ParsingConfig { ConvertObjectToSupportComparison = true});
-
-            var expression = parser.Parse(typeof(string));
-
-            Issue389DoesNotWork();
-            return;
-            Issue389_Works();
-            return;
-
-            var q = new[]
-            {
-                new X { Key = "x" },
-                new X { Key = "a" },
-                new X { Key = "a", Contestants = new List<Y> { new Y() } }
-            }.AsQueryable();
-            var groupByKey = q.GroupBy("Key");
-            var selectQry = groupByKey.Select("new (Key, Sum(np(Contestants.Count, 0)) As TotalCount)").ToDynamicList();
-
-            Normal();
-            Dynamic();
-        }
-
-        private static void Issue389_Works()
+            ""first"": 1,
+            ""City"": ""Paris"",
+            ""third"": ""test""
+        },
         {
-            var strArray = new[] { "1", "2", "3", "4" };
-            var x = new List<ParameterExpression>();
-            x.Add(Expression.Parameter(strArray.GetType(), "strArray"));
+            ""first"": 2,
+            ""City"": ""New York"",
+            ""third"": ""abc""
+        }]");
 
-            string query = "string.Join(\",\", strArray)";
+        var where = array.Where("City == @0", "Paris");
+        foreach (var result in where)
+        {
+            Console.WriteLine(result["first"]);
+        }
 
-            var e = DynamicExpressionParser.ParseLambda(x.ToArray(), null, query);
-            Delegate del = e.Compile();
-            var result1 = del.DynamicInvoke(new object?[] { strArray });
-            Console.WriteLine(result1);
+        var select = array.Select("City");
+        foreach (var result in select)
+        {
+            Console.WriteLine(result);
         }
 
-        private static void Issue389WorksWithInts()
+        var whereWithSelect = array.Where("City == @0", "Paris").Select("first");
+        foreach (var result in whereWithSelect)
         {
-            var intArray = new object[] { 1, 2, 3, 4 };
-            var x = new List<ParameterExpression>();
-            x.Add(Expression.Parameter(intArray.GetType(), "intArray"));
+            Console.WriteLine(result);
+        }
+    }
 
-            string query = "string.Join(\",\", intArray)";
+    private static void Json()
+    {
+        var doc = JsonDocument.Parse(@"[
+        {
+            ""first"": 1,
+            ""City"": ""Paris"",
+            ""third"": ""test""
+        },
+        {
+            ""first"": 2,
+            ""City"": ""New York"",
+            ""third"": ""abc""
+        }]");
 
-            var e = DynamicExpressionParser.ParseLambda(x.ToArray(), null, query);
-            Delegate del = e.Compile();
-            var result = del.DynamicInvoke(new object?[] { intArray });
+        var where = doc.Where("City == @0", "Paris");
+        foreach (var result in where.RootElement.EnumerateArray())
+        {
+            Console.WriteLine(result.GetProperty("first"));
+        }
 
+        var select = doc.Select("City");
+        foreach (var result in select.RootElement.EnumerateArray())
+        {
             Console.WriteLine(result);
         }
 
-        private static void Issue389DoesNotWork()
+        var whereWithSelect = doc.Where("City == @0", "Paris").Select("first");
+        foreach (var result in whereWithSelect.RootElement.EnumerateArray())
         {
-            var intArray = new [] { 1, 2, 3, 4 };
-            var x = new List<ParameterExpression>();
-            x.Add(Expression.Parameter(intArray.GetType(), "intArray"));
+            Console.WriteLine(result);
+        }
+    }
 
-            string query = "string.Join(\",\", intArray)";
+    private static void Issue389_Works()
+    {
+        var strArray = new[] { "1", "2", "3", "4" };
+        var x = new List<ParameterExpression>();
+        x.Add(Expression.Parameter(strArray.GetType(), "strArray"));
 
-            var e = DynamicExpressionParser.ParseLambda(x.ToArray(), null, query);
-            Delegate del = e.Compile();
-            var result = del.DynamicInvoke(new object?[] { intArray });
+        string query = "string.Join(\",\", strArray)";
 
-            Console.WriteLine(result);
-        }
+        var e = DynamicExpressionParser.ParseLambda(x.ToArray(), null, query);
+        Delegate del = e.Compile();
+        var result1 = del.DynamicInvoke(new object?[] { strArray });
+        Console.WriteLine(result1);
+    }
 
-        private static void Normal()
-        {
-            var e = new int[0].AsQueryable();
-            var q = new[] { 1 }.AsQueryable();
+    private static void Issue389WorksWithInts()
+    {
+        var intArray = new object[] { 1, 2, 3, 4 };
+        var x = new List<ParameterExpression>();
+        x.Add(Expression.Parameter(intArray.GetType(), "intArray"));
 
-            var a = q.FirstOrDefault();
-            var b = e.FirstOrDefault(44);
+        string query = "string.Join(\",\", intArray)";
 
-            var c = q.FirstOrDefault(i => i == 0);
-            var d = q.FirstOrDefault(i => i == 0, 42);
+        var e = DynamicExpressionParser.ParseLambda(x.ToArray(), null, query);
+        Delegate del = e.Compile();
+        var result = del.DynamicInvoke(new object?[] { intArray });
 
-            var t = q.Take(1);
-        }
+        Console.WriteLine(result);
+    }
 
-        private static void Dynamic()
-        {
-            var e = new int[0].AsQueryable() as IQueryable;
-            var q = new[] { 1 }.AsQueryable() as IQueryable;
+    private static void Issue389DoesNotWork()
+    {
+        var intArray = new[] { 1, 2, 3, 4 };
+        var x = new List<ParameterExpression>();
+        x.Add(Expression.Parameter(intArray.GetType(), "intArray"));
 
-            var a = q.FirstOrDefault();
-            //var b = e.FirstOrDefault(44);
+        string query = "string.Join(\",\", intArray)";
 
-            var c = q.FirstOrDefault("it == 0");
-            //var d = q.FirstOrDefault(i => i == 0, 42);
-        }
+        var e = DynamicExpressionParser.ParseLambda(x.ToArray(), null, query);
+        Delegate del = e.Compile();
+        var result = del.DynamicInvoke(new object?[] { intArray });
+
+        Console.WriteLine(result);
+    }
+
+    private static void Normal()
+    {
+        var e = new int[0].AsQueryable();
+        var q = new[] { 1 }.AsQueryable();
+
+        var a = q.FirstOrDefault();
+        var b = e.FirstOrDefault(44);
+
+        var c = q.FirstOrDefault(i => i == 0);
+        var d = q.FirstOrDefault(i => i == 0, 42);
+
+        var t = q.Take(1);
+    }
+
+    private static void Dynamic()
+    {
+        var e = new int[0].AsQueryable() as IQueryable;
+        var q = new[] { 1 }.AsQueryable() as IQueryable;
+
+        var a = q.FirstOrDefault();
+        //var b = e.FirstOrDefault(44);
+
+        var c = q.FirstOrDefault("it == 0");
+        //var d = q.FirstOrDefault(i => i == 0, 42);
     }
 }