Add tests

src/Compiler/Microsoft.AspNetCore.Razor.Language/test/IntegrationTests/ComponentCodeGenerationTestBase.cs

@@ -1733,6 +1733,93 @@ public class MyComponent<T> : ComponentBase
         CompileToAssembly(generated);
     }
 
+    [IntegrationTestFact, WorkItem("https://github.com/dotnet/aspnetcore/issues/48778")]
+    public void ImplicitStringConversion_ParameterCasing_AddAttribute()
+    {
+        _configuration = base.Configuration with { LanguageVersion = RazorLanguageVersion.Version_7_0 };
+
+        AdditionalSyntaxTrees.Add(Parse("""
+            using Microsoft.AspNetCore.Components;
+
+            namespace Test;
+
+            public class MyClass
+            {
+                public static implicit operator string(MyClass c) => "";
+            }
+
+            public class MyComponent : ComponentBase
+            {
+                [Parameter] public string Placeholder { get; set; } = "";
+            }
+            """));
+
+        var generated = CompileToCSharp("""
+            <MyComponent PlaceHolder="@(new MyClass())" />
+            """);
+
+        AssertDocumentNodeMatchesBaseline(generated.CodeDocument);
+        AssertCSharpDocumentMatchesBaseline(generated.CodeDocument);
+        CompileToAssembly(generated);
+    }
+
+    [IntegrationTestFact, WorkItem("https://github.com/dotnet/aspnetcore/issues/48778")]
+    public void ImplicitStringConversion_ParameterCasing_AddComponentParameter()
+    {
+        AdditionalSyntaxTrees.Add(Parse("""
+            using Microsoft.AspNetCore.Components;
+
+            namespace Test;
+
+            public class MyClass
+            {
+                public static implicit operator string(MyClass c) => "";
+            }
+
+            public class MyComponent : ComponentBase
+            {
+                [Parameter] public string Placeholder { get; set; } = "";
+            }
+            """));
+
+        var generated = CompileToCSharp("""
+            <MyComponent PlaceHolder="@(new MyClass())" />
+            """);
+
+        AssertDocumentNodeMatchesBaseline(generated.CodeDocument);
+        AssertCSharpDocumentMatchesBaseline(generated.CodeDocument);
+        CompileToAssembly(generated);
+    }
+
+    [IntegrationTestFact, WorkItem("https://github.com/dotnet/aspnetcore/issues/48778")]
+    public void ImplicitStringConversion_ParameterCasing_Multiple()
+    {
+        AdditionalSyntaxTrees.Add(Parse("""
+            using Microsoft.AspNetCore.Components;
+
+            namespace Test;
+
+            public class MyClass
+            {
+                public static implicit operator string(MyClass c) => "";
+            }
+
+            public class MyComponent : ComponentBase
+            {
+                [Parameter] public string Placeholder { get; set; } = "";
+                [Parameter] public string PlaceHolder { get; set; } = "";
+            }
+            """));
+
+        var generated = CompileToCSharp("""
+            <MyComponent PlaceHolder="@(new MyClass())" />
+            """);
+
+        AssertDocumentNodeMatchesBaseline(generated.CodeDocument);
+        AssertCSharpDocumentMatchesBaseline(generated.CodeDocument);
+        CompileToAssembly(generated);
+    }
+
     [IntegrationTestFact, WorkItem("https://dev.azure.com/devdiv/DevDiv/_workitems/edit/1869483")]
     public void AddComponentParameter()
     {

src/Compiler/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/ImplicitStringConversion_ParameterCasing_AddAttribute/TestComponent.codegen.cs

@@ -0,0 +1,50 @@
+// <auto-generated/>
+#pragma warning disable 1591
+namespace Test
+{
+    #line default
+    using global::System;
+    using global::System.Collections.Generic;
+    using global::System.Linq;
+    using global::System.Threading.Tasks;
+    using global::Microsoft.AspNetCore.Components;
+    #line default
+    #line hidden
+    #nullable restore
+    public partial class TestComponent : global::Microsoft.AspNetCore.Components.ComponentBase
+    #nullable disable
+    {
+        #pragma warning disable 219
+        private void __RazorDirectiveTokenHelpers__() {
+        }
+        #pragma warning restore 219
+        #pragma warning disable 0414
+        private static object __o = null;
+        #pragma warning restore 0414
+        #pragma warning disable 1998
+        protected override void BuildRenderTree(global::Microsoft.AspNetCore.Components.Rendering.RenderTreeBuilder __builder)
+        {
+            __o = 
+#nullable restore
+#line 1 "x:\dir\subdir\Test\TestComponent.cshtml"
+                            new MyClass()
+
+#line default
+#line hidden
+#nullable disable
+            ;
+            __builder.AddAttribute(-1, "ChildContent", (global::Microsoft.AspNetCore.Components.RenderFragment)((__builder2) => {
+            }
+            ));
+#nullable restore
+#line 1 "x:\dir\subdir\Test\TestComponent.cshtml"
+__o = typeof(global::Test.MyComponent);
+
+#line default
+#line hidden
+#nullable disable
+        }
+        #pragma warning restore 1998
+    }
+}
+#pragma warning restore 1591

src/Compiler/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/ImplicitStringConversion_ParameterCasing_AddAttribute/TestComponent.ir.txt

@@ -0,0 +1,20 @@
+Document - 
+    NamespaceDeclaration -  - Test
+        UsingDirective - (3:1,1 [20] ) - global::System
+        UsingDirective - (26:2,1 [40] ) - global::System.Collections.Generic
+        UsingDirective - (69:3,1 [25] ) - global::System.Linq
+        UsingDirective - (97:4,1 [36] ) - global::System.Threading.Tasks
+        UsingDirective - (136:5,1 [45] ) - global::Microsoft.AspNetCore.Components
+        ClassDeclaration -  - public partial - TestComponent - global::Microsoft.AspNetCore.Components.ComponentBase - 
+            DesignTimeDirective - 
+            CSharpCode - 
+                IntermediateToken -  - CSharp - #pragma warning disable 0414
+            CSharpCode - 
+                IntermediateToken -  - CSharp - private static object __o = null;
+            CSharpCode - 
+                IntermediateToken -  - CSharp - #pragma warning restore 0414
+            MethodDeclaration -  - protected override - void - BuildRenderTree
+                Component - (0:0,0 [46] x:\dir\subdir\Test\TestComponent.cshtml) - MyComponent
+                    ComponentAttribute -  - PlaceHolder -  - AttributeStructure.DoubleQuotes
+                        CSharpExpression - (26:0,26 [16] x:\dir\subdir\Test\TestComponent.cshtml)
+                            LazyIntermediateToken - (28:0,28 [13] x:\dir\subdir\Test\TestComponent.cshtml) - CSharp - new MyClass()

src/Compiler/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/ImplicitStringConversion_ParameterCasing_AddAttribute/TestComponent.mappings.txt

@@ -0,0 +1,5 @@
+Source Location: (28:0,28 [13] x:\dir\subdir\Test\TestComponent.cshtml)
+|new MyClass()|
+Generated Location: (1033:29,28 [13] )
+|new MyClass()|
+

src/Compiler/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/ImplicitStringConversion_ParameterCasing_AddComponentParameter/TestComponent.codegen.cs

@@ -0,0 +1,50 @@
+// <auto-generated/>
+#pragma warning disable 1591
+namespace Test
+{
+    #line default
+    using global::System;
+    using global::System.Collections.Generic;
+    using global::System.Linq;
+    using global::System.Threading.Tasks;
+    using global::Microsoft.AspNetCore.Components;
+    #line default
+    #line hidden
+    #nullable restore
+    public partial class TestComponent : global::Microsoft.AspNetCore.Components.ComponentBase
+    #nullable disable
+    {
+        #pragma warning disable 219
+        private void __RazorDirectiveTokenHelpers__() {
+        }
+        #pragma warning restore 219
+        #pragma warning disable 0414
+        private static object __o = null;
+        #pragma warning restore 0414
+        #pragma warning disable 1998
+        protected override void BuildRenderTree(global::Microsoft.AspNetCore.Components.Rendering.RenderTreeBuilder __builder)
+        {
+            __o = 
+#nullable restore
+#line 1 "x:\dir\subdir\Test\TestComponent.cshtml"
+                            new MyClass()
+
+#line default
+#line hidden
+#nullable disable
+            ;
+            __builder.AddAttribute(-1, "ChildContent", (global::Microsoft.AspNetCore.Components.RenderFragment)((__builder2) => {
+            }
+            ));
+#nullable restore
+#line 1 "x:\dir\subdir\Test\TestComponent.cshtml"
+__o = typeof(global::Test.MyComponent);
+
+#line default
+#line hidden
+#nullable disable
+        }
+        #pragma warning restore 1998
+    }
+}
+#pragma warning restore 1591

src/Compiler/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/ImplicitStringConversion_ParameterCasing_AddComponentParameter/TestComponent.ir.txt

@@ -0,0 +1,20 @@
+Document - 
+    NamespaceDeclaration -  - Test
+        UsingDirective - (3:1,1 [20] ) - global::System
+        UsingDirective - (26:2,1 [40] ) - global::System.Collections.Generic
+        UsingDirective - (69:3,1 [25] ) - global::System.Linq
+        UsingDirective - (97:4,1 [36] ) - global::System.Threading.Tasks
+        UsingDirective - (136:5,1 [45] ) - global::Microsoft.AspNetCore.Components
+        ClassDeclaration -  - public partial - TestComponent - global::Microsoft.AspNetCore.Components.ComponentBase - 
+            DesignTimeDirective - 
+            CSharpCode - 
+                IntermediateToken -  - CSharp - #pragma warning disable 0414
+            CSharpCode - 
+                IntermediateToken -  - CSharp - private static object __o = null;
+            CSharpCode - 
+                IntermediateToken -  - CSharp - #pragma warning restore 0414
+            MethodDeclaration -  - protected override - void - BuildRenderTree
+                Component - (0:0,0 [46] x:\dir\subdir\Test\TestComponent.cshtml) - MyComponent
+                    ComponentAttribute -  - PlaceHolder -  - AttributeStructure.DoubleQuotes
+                        CSharpExpression - (26:0,26 [16] x:\dir\subdir\Test\TestComponent.cshtml)
+                            LazyIntermediateToken - (28:0,28 [13] x:\dir\subdir\Test\TestComponent.cshtml) - CSharp - new MyClass()

src/Compiler/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/ImplicitStringConversion_ParameterCasing_AddComponentParameter/TestComponent.mappings.txt

@@ -0,0 +1,5 @@
+Source Location: (28:0,28 [13] x:\dir\subdir\Test\TestComponent.cshtml)
+|new MyClass()|
+Generated Location: (1033:29,28 [13] )
+|new MyClass()|
+

src/Compiler/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/ImplicitStringConversion_ParameterCasing_Multiple/TestComponent.codegen.cs

@@ -0,0 +1,61 @@
+// <auto-generated/>
+#pragma warning disable 1591
+namespace Test
+{
+    #line default
+    using global::System;
+    using global::System.Collections.Generic;
+    using global::System.Linq;
+    using global::System.Threading.Tasks;
+    using global::Microsoft.AspNetCore.Components;
+    #line default
+    #line hidden
+    #nullable restore
+    public partial class TestComponent : global::Microsoft.AspNetCore.Components.ComponentBase
+    #nullable disable
+    {
+        #pragma warning disable 219
+        private void __RazorDirectiveTokenHelpers__() {
+        }
+        #pragma warning restore 219
+        #pragma warning disable 0414
+        private static object __o = null;
+        #pragma warning restore 0414
+        #pragma warning disable 1998
+        protected override void BuildRenderTree(global::Microsoft.AspNetCore.Components.Rendering.RenderTreeBuilder __builder)
+        {
+            __o = global::Microsoft.AspNetCore.Components.CompilerServices.RuntimeHelpers.TypeCheck<global::System.String>(
+#nullable restore
+#line 1 "x:\dir\subdir\Test\TestComponent.cshtml"
+                            new MyClass()
+
+#line default
+#line hidden
+#nullable disable
+            );
+            __builder.AddAttribute(-1, "ChildContent", (global::Microsoft.AspNetCore.Components.RenderFragment)((__builder2) => {
+            }
+            ));
+            #pragma warning disable BL0005
+            ((global::Test.MyComponent)default).
+#nullable restore
+#line 1 "x:\dir\subdir\Test\TestComponent.cshtml"
+             PlaceHolder
+
+#line default
+#line hidden
+#nullable disable
+             = default;
+            #pragma warning restore BL0005
+#nullable restore
+#line 1 "x:\dir\subdir\Test\TestComponent.cshtml"
+__o = typeof(global::Test.MyComponent);
+
+#line default
+#line hidden
+#nullable disable
+        }
+        #pragma warning restore 1998
+    }
+}
+#pragma warning restore 1591

src/Compiler/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/ImplicitStringConversion_ParameterCasing_Multiple/TestComponent.ir.txt

@@ -0,0 +1,20 @@
+Document - 
+    NamespaceDeclaration -  - Test
+        UsingDirective - (3:1,1 [20] ) - global::System
+        UsingDirective - (26:2,1 [40] ) - global::System.Collections.Generic
+        UsingDirective - (69:3,1 [25] ) - global::System.Linq
+        UsingDirective - (97:4,1 [36] ) - global::System.Threading.Tasks
+        UsingDirective - (136:5,1 [45] ) - global::Microsoft.AspNetCore.Components
+        ClassDeclaration -  - public partial - TestComponent - global::Microsoft.AspNetCore.Components.ComponentBase - 
+            DesignTimeDirective - 
+            CSharpCode - 
+                IntermediateToken -  - CSharp - #pragma warning disable 0414
+            CSharpCode - 
+                IntermediateToken -  - CSharp - private static object __o = null;
+            CSharpCode - 
+                IntermediateToken -  - CSharp - #pragma warning restore 0414
+            MethodDeclaration -  - protected override - void - BuildRenderTree
+                Component - (0:0,0 [46] x:\dir\subdir\Test\TestComponent.cshtml) - MyComponent
+                    ComponentAttribute - (26:0,26 [16] x:\dir\subdir\Test\TestComponent.cshtml) - PlaceHolder - PlaceHolder - AttributeStructure.DoubleQuotes
+                        CSharpExpression - (28:0,28 [13] x:\dir\subdir\Test\TestComponent.cshtml)
+                            LazyIntermediateToken - (28:0,28 [13] x:\dir\subdir\Test\TestComponent.cshtml) - CSharp - new MyClass()

src/Compiler/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/ImplicitStringConversion_ParameterCasing_Multiple/TestComponent.mappings.txt

@@ -0,0 +1,10 @@
+Source Location: (28:0,28 [13] x:\dir\subdir\Test\TestComponent.cshtml)
+|new MyClass()|
+Generated Location: (1138:29,28 [13] )
+|new MyClass()|
+
+Source Location: (13:0,13 [11] x:\dir\subdir\Test\TestComponent.cshtml)
+|PlaceHolder|
+Generated Location: (1559:42,13 [11] )
+|PlaceHolder|
+

src/Compiler/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/ImplicitStringConversion_ParameterCasing_AddAttribute/TestComponent.codegen.cs

@@ -0,0 +1,35 @@
+// <auto-generated/>
+#pragma warning disable 1591
+namespace Test
+{
+    #line default
+    using global::System;
+    using global::System.Collections.Generic;
+    using global::System.Linq;
+    using global::System.Threading.Tasks;
+    using global::Microsoft.AspNetCore.Components;
+    #line default
+    #line hidden
+    #nullable restore
+    public partial class TestComponent : global::Microsoft.AspNetCore.Components.ComponentBase
+    #nullable disable
+    {
+        #pragma warning disable 1998
+        protected override void BuildRenderTree(global::Microsoft.AspNetCore.Components.Rendering.RenderTreeBuilder __builder)
+        {
+            __builder.OpenComponent<global::Test.MyComponent>(0);
+            __builder.AddAttribute(1, "PlaceHolder", (object)(
+#nullable restore
+#line (1,29)-(1,42) "x:\dir\subdir\Test\TestComponent.cshtml"
+new MyClass()
+
+#line default
+#line hidden
+#nullable disable
+            ));
+            __builder.CloseComponent();
+        }
+        #pragma warning restore 1998
+    }
+}
+#pragma warning restore 1591

src/Compiler/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/ImplicitStringConversion_ParameterCasing_AddAttribute/TestComponent.ir.txt

@@ -0,0 +1,13 @@
+Document - 
+    NamespaceDeclaration -  - Test
+        UsingDirective - (3:1,1 [22] ) - global::System
+        UsingDirective - (26:2,1 [42] ) - global::System.Collections.Generic
+        UsingDirective - (69:3,1 [27] ) - global::System.Linq
+        UsingDirective - (97:4,1 [38] ) - global::System.Threading.Tasks
+        UsingDirective - (136:5,1 [47] ) - global::Microsoft.AspNetCore.Components
+        ClassDeclaration -  - public partial - TestComponent - global::Microsoft.AspNetCore.Components.ComponentBase - 
+            MethodDeclaration -  - protected override - void - BuildRenderTree
+                Component - (0:0,0 [46] x:\dir\subdir\Test\TestComponent.cshtml) - MyComponent
+                    ComponentAttribute -  - PlaceHolder -  - AttributeStructure.DoubleQuotes
+                        CSharpExpression - (26:0,26 [16] x:\dir\subdir\Test\TestComponent.cshtml)
+                            LazyIntermediateToken - (28:0,28 [13] x:\dir\subdir\Test\TestComponent.cshtml) - CSharp - new MyClass()

src/Compiler/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentRuntimeCodeGenerationTest/ImplicitStringConversion_ParameterCasing_AddAttribute/TestComponent.mappings.txt

@@ -0,0 +1,5 @@
+Source Location: (28:0,28 [13] x:\dir\subdir\Test\TestComponent.cshtml)
+|new MyClass()|
+Generated Location: (867:23,0 [13] )
+|new MyClass()|
+