[release/6.0] Support generic array parameters in components

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

@@ -231,6 +231,65 @@ @typeparam TItem2
             CompileToAssembly(generated);
         }
 
+        [Fact]
+        public void ComponentWithTypeParameterArray()
+        {
+            // Arrange
+            var classes = @"
+public class Tag
+{
+    public string description { get; set; }
+}
+";
+
+            AdditionalSyntaxTrees.Add(Parse(classes));
+
+            // Act
+            var generated = CompileToCSharp(@"
+@using Microsoft.AspNetCore.Components;
+@typeparam TItem
+
+<h1>Item</h1>
+
+<p>@ChildContent(Items1)</p>
+
+@foreach (var item in Items2)
+{
+    <p>@ChildContent(item)</p>
+}
+
+<p>@ChildContent(Items3())</p>
+
+@code {
+    [Parameter] public TItem[] Items1 { get; set; }
+    [Parameter] public List<TItem[]> Items2 { get; set; }
+    [Parameter] public Func<TItem[]> Items3 { get; set; }
+    [Parameter] public RenderFragment<TItem[]> ChildContent { get; set; }
+}");
+
+            // Assert
+            AssertDocumentNodeMatchesBaseline(generated.CodeDocument);
+            AssertCSharpDocumentMatchesBaseline(generated.CodeDocument);
+            CompileToAssembly(generated);
+
+            AdditionalSyntaxTrees.Add(Parse(generated.CodeDocument.GetCSharpDocument().GeneratedCode));
+            var useGenerated = CompileToCSharp("UseTestComponent.cshtml", @"
+@using Test
+<TestComponent Items1=items1 Items2=items2 Items3=items3>
+    <p>@context[0].description</p>
+</TestComponent>
+
+@code {
+    static Tag tag = new Tag() { description = ""A description.""};
+    Tag[] items1 = new [] { tag };
+    List<Tag[]> items2 = new List<Tag[]>() { new [] { tag } };
+    Tag[] items3() => new [] { tag };
+}");
+            AssertDocumentNodeMatchesBaseline(useGenerated.CodeDocument);
+            AssertCSharpDocumentMatchesBaseline(useGenerated.CodeDocument);
+            CompileToAssembly(useGenerated);
+        }
+
         [Fact]
         public void ComponentWithConstrainedTypeParameters()
         {

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

@@ -0,0 +1,92 @@
+// <auto-generated/>
+#pragma warning disable 1591
+namespace Test
+{
+    #line hidden
+    using System;
+    using System.Collections.Generic;
+    using System.Linq;
+    using System.Threading.Tasks;
+#nullable restore
+#line 1 "x:\dir\subdir\Test\TestComponent.cshtml"
+using Microsoft.AspNetCore.Components;
+
+#line default
+#line hidden
+#nullable disable
+    public partial class TestComponent<TItem> : Microsoft.AspNetCore.Components.ComponentBase
+    {
+        #pragma warning disable 219
+        private void __RazorDirectiveTokenHelpers__() {
+        ((System.Action)(() => {
+#nullable restore
+#line 2 "x:\dir\subdir\Test\TestComponent.cshtml"
+global::System.Object TItem = null!;
+
+#line default
+#line hidden
+#nullable disable
+        }
+        ))();
+        }
+        #pragma warning restore 219
+        #pragma warning disable 0414
+        private static System.Object __o = null;
+        #pragma warning restore 0414
+        #pragma warning disable 1998
+        protected override void BuildRenderTree(Microsoft.AspNetCore.Components.Rendering.RenderTreeBuilder __builder)
+        {
+#nullable restore
+#line 6 "x:\dir\subdir\Test\TestComponent.cshtml"
+__o = ChildContent(Items1);
+
+#line default
+#line hidden
+#nullable disable
+#nullable restore
+#line 8 "x:\dir\subdir\Test\TestComponent.cshtml"
+ foreach (var item in Items2)
+{
+
+
+#line default
+#line hidden
+#nullable disable
+#nullable restore
+#line 10 "x:\dir\subdir\Test\TestComponent.cshtml"
+  __o = ChildContent(item);
+
+#line default
+#line hidden
+#nullable disable
+#nullable restore
+#line 10 "x:\dir\subdir\Test\TestComponent.cshtml"
+
+}
+
+#line default
+#line hidden
+#nullable disable
+#nullable restore
+#line 13 "x:\dir\subdir\Test\TestComponent.cshtml"
+__o = ChildContent(Items3());
+
+#line default
+#line hidden
+#nullable disable
+        }
+        #pragma warning restore 1998
+#nullable restore
+#line 15 "x:\dir\subdir\Test\TestComponent.cshtml"
+
+    [Parameter] public TItem[] Items1 { get; set; }
+    [Parameter] public List<TItem[]> Items2 { get; set; }
+    [Parameter] public Func<TItem[]> Items3 { get; set; }
+    [Parameter] public RenderFragment<TItem[]> ChildContent { get; set; }
+
+#line default
+#line hidden
+#nullable disable
+    }
+}
+#pragma warning restore 1591

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

@@ -0,0 +1,47 @@
+Document - 
+    NamespaceDeclaration -  - Test
+        UsingDirective - (3:1,1 [12] ) - System
+        UsingDirective - (18:2,1 [32] ) - System.Collections.Generic
+        UsingDirective - (53:3,1 [17] ) - System.Linq
+        UsingDirective - (73:4,1 [28] ) - System.Threading.Tasks
+        UsingDirective - (1:0,1 [38] x:\dir\subdir\Test\TestComponent.cshtml) - Microsoft.AspNetCore.Components
+        ClassDeclaration -  - public partial - TestComponent - Microsoft.AspNetCore.Components.ComponentBase -  - TItem
+            DesignTimeDirective - 
+                DirectiveToken - (52:1,11 [5] x:\dir\subdir\Test\TestComponent.cshtml) - TItem
+            CSharpCode - 
+                IntermediateToken -  - CSharp - #pragma warning disable 0414
+            CSharpCode - 
+                IntermediateToken -  - CSharp - private static System.Object __o = null;
+            CSharpCode - 
+                IntermediateToken -  - CSharp - #pragma warning restore 0414
+            MethodDeclaration -  - protected override - void - BuildRenderTree
+                HtmlContent - (39:0,39 [2] x:\dir\subdir\Test\TestComponent.cshtml)
+                    LazyIntermediateToken - (39:0,39 [2] x:\dir\subdir\Test\TestComponent.cshtml) - Html - \n
+                HtmlContent - (59:2,0 [2] x:\dir\subdir\Test\TestComponent.cshtml)
+                    LazyIntermediateToken - (59:2,0 [2] x:\dir\subdir\Test\TestComponent.cshtml) - Html - \n
+                MarkupElement - (61:3,0 [13] x:\dir\subdir\Test\TestComponent.cshtml) - h1
+                    HtmlContent - (65:3,4 [4] x:\dir\subdir\Test\TestComponent.cshtml)
+                        LazyIntermediateToken - (65:3,4 [4] x:\dir\subdir\Test\TestComponent.cshtml) - Html - Item
+                HtmlContent - (74:3,13 [4] x:\dir\subdir\Test\TestComponent.cshtml)
+                    LazyIntermediateToken - (74:3,13 [4] x:\dir\subdir\Test\TestComponent.cshtml) - Html - \n\n
+                MarkupElement - (78:5,0 [28] x:\dir\subdir\Test\TestComponent.cshtml) - p
+                    CSharpExpression - (82:5,4 [20] x:\dir\subdir\Test\TestComponent.cshtml)
+                        LazyIntermediateToken - (82:5,4 [20] x:\dir\subdir\Test\TestComponent.cshtml) - CSharp - ChildContent(Items1)
+                HtmlContent - (106:5,28 [4] x:\dir\subdir\Test\TestComponent.cshtml)
+                    LazyIntermediateToken - (106:5,28 [4] x:\dir\subdir\Test\TestComponent.cshtml) - Html - \n\n
+                CSharpCode - (111:7,1 [37] x:\dir\subdir\Test\TestComponent.cshtml)
+                    LazyIntermediateToken - (111:7,1 [37] x:\dir\subdir\Test\TestComponent.cshtml) - CSharp - foreach (var item in Items2)\n{\n    
+                MarkupElement - (148:9,4 [26] x:\dir\subdir\Test\TestComponent.cshtml) - p
+                    CSharpExpression - (152:9,8 [18] x:\dir\subdir\Test\TestComponent.cshtml)
+                        LazyIntermediateToken - (152:9,8 [18] x:\dir\subdir\Test\TestComponent.cshtml) - CSharp - ChildContent(item)
+                CSharpCode - (174:9,30 [3] x:\dir\subdir\Test\TestComponent.cshtml)
+                    LazyIntermediateToken - (174:9,30 [3] x:\dir\subdir\Test\TestComponent.cshtml) - CSharp - \n}
+                HtmlContent - (177:10,1 [4] x:\dir\subdir\Test\TestComponent.cshtml)
+                    LazyIntermediateToken - (177:10,1 [4] x:\dir\subdir\Test\TestComponent.cshtml) - Html - \n\n
+                MarkupElement - (181:12,0 [30] x:\dir\subdir\Test\TestComponent.cshtml) - p
+                    CSharpExpression - (185:12,4 [22] x:\dir\subdir\Test\TestComponent.cshtml)
+                        LazyIntermediateToken - (185:12,4 [22] x:\dir\subdir\Test\TestComponent.cshtml) - CSharp - ChildContent(Items3())
+                HtmlContent - (211:12,30 [4] x:\dir\subdir\Test\TestComponent.cshtml)
+                    LazyIntermediateToken - (211:12,30 [4] x:\dir\subdir\Test\TestComponent.cshtml) - Html - \n\n
+            CSharpCode - (222:14,7 [248] x:\dir\subdir\Test\TestComponent.cshtml)
+                LazyIntermediateToken - (222:14,7 [248] x:\dir\subdir\Test\TestComponent.cshtml) - CSharp - \n    [Parameter] public TItem[] Items1 { get; set; }\n    [Parameter] public List<TItem[]> Items2 { get; set; }\n    [Parameter] public Func<TItem[]> Items3 { get; set; }\n    [Parameter] public RenderFragment<TItem[]> ChildContent { get; set; }\n

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

@@ -0,0 +1,56 @@
+Source Location: (1:0,1 [38] x:\dir\subdir\Test\TestComponent.cshtml)
+|using Microsoft.AspNetCore.Components;|
+Generated Location: (276:11,0 [38] )
+|using Microsoft.AspNetCore.Components;|
+
+Source Location: (52:1,11 [5] x:\dir\subdir\Test\TestComponent.cshtml)
+|TItem|
+Generated Location: (688:23,22 [5] )
+|TItem|
+
+Source Location: (82:5,4 [20] x:\dir\subdir\Test\TestComponent.cshtml)
+|ChildContent(Items1)|
+Generated Location: (1199:40,6 [20] )
+|ChildContent(Items1)|
+
+Source Location: (111:7,1 [37] x:\dir\subdir\Test\TestComponent.cshtml)
+|foreach (var item in Items2)
+{
+    |
+Generated Location: (1343:47,1 [37] )
+|foreach (var item in Items2)
+{
+    |
+
+Source Location: (152:9,8 [18] x:\dir\subdir\Test\TestComponent.cshtml)
+|ChildContent(item)|
+Generated Location: (1511:56,8 [18] )
+|ChildContent(item)|
+
+Source Location: (174:9,30 [3] x:\dir\subdir\Test\TestComponent.cshtml)
+|
+}|
+Generated Location: (1683:63,30 [3] )
+|
+}|
+
+Source Location: (185:12,4 [22] x:\dir\subdir\Test\TestComponent.cshtml)
+|ChildContent(Items3())|
+Generated Location: (1815:71,6 [22] )
+|ChildContent(Items3())|
+
+Source Location: (222:14,7 [248] x:\dir\subdir\Test\TestComponent.cshtml)
+|
+    [Parameter] public TItem[] Items1 { get; set; }
+    [Parameter] public List<TItem[]> Items2 { get; set; }
+    [Parameter] public Func<TItem[]> Items3 { get; set; }
+    [Parameter] public RenderFragment<TItem[]> ChildContent { get; set; }
+|
+Generated Location: (2017:80,7 [248] )
+|
+    [Parameter] public TItem[] Items1 { get; set; }
+    [Parameter] public List<TItem[]> Items2 { get; set; }
+    [Parameter] public Func<TItem[]> Items3 { get; set; }
+    [Parameter] public RenderFragment<TItem[]> ChildContent { get; set; }
+|
+

src/Razor/Microsoft.AspNetCore.Razor.Language/test/TestFiles/IntegrationTests/ComponentDesignTimeCodeGenerationTest/ComponentWithTypeParameterArray/UseTestComponent.codegen.cs

@@ -0,0 +1,102 @@
+// <auto-generated/>
+#pragma warning disable 1591
+namespace Test
+{
+    #line hidden
+    using System;
+    using System.Collections.Generic;
+    using System.Linq;
+    using System.Threading.Tasks;
+    using Microsoft.AspNetCore.Components;
+#nullable restore
+#line 1 "x:\dir\subdir\Test\UseTestComponent.cshtml"
+using Test;
+
+#line default
+#line hidden
+#nullable disable
+    public partial class UseTestComponent : Microsoft.AspNetCore.Components.ComponentBase
+    {
+        #pragma warning disable 219
+        private void __RazorDirectiveTokenHelpers__() {
+        }
+        #pragma warning restore 219
+        #pragma warning disable 0414
+        private static System.Object __o = null;
+        #pragma warning restore 0414
+        #pragma warning disable 1998
+        protected override void BuildRenderTree(Microsoft.AspNetCore.Components.Rendering.RenderTreeBuilder __builder)
+        {
+            __Blazor.Test.UseTestComponent.TypeInference.CreateTestComponent_0(__builder, -1, -1, 
+#nullable restore
+#line 2 "x:\dir\subdir\Test\UseTestComponent.cshtml"
+                      items1
+
+#line default
+#line hidden
+#nullable disable
+            , -1, 
+#nullable restore
+#line 2 "x:\dir\subdir\Test\UseTestComponent.cshtml"
+                                    items2
+
+#line default
+#line hidden
+#nullable disable
+            , -1, 
+#nullable restore
+#line 2 "x:\dir\subdir\Test\UseTestComponent.cshtml"
+                                                  items3
+
+#line default
+#line hidden
+#nullable disable
+            , -1, (context) => (__builder2) => {
+#nullable restore
+#line 3 "x:\dir\subdir\Test\UseTestComponent.cshtml"
+  __o = context[0].description;
+
+#line default
+#line hidden
+#nullable disable
+            }
+            );
+#nullable restore
+#line 2 "x:\dir\subdir\Test\UseTestComponent.cshtml"
+__o = typeof(TestComponent<>);
+
+#line default
+#line hidden
+#nullable disable
+        }
+        #pragma warning restore 1998
+#nullable restore
+#line 6 "x:\dir\subdir\Test\UseTestComponent.cshtml"
+
+    static Tag tag = new Tag() { description = "A description."};
+    Tag[] items1 = new [] { tag };
+    List<Tag[]> items2 = new List<Tag[]>() { new [] { tag } };
+    Tag[] items3() => new [] { tag };
+
+#line default
+#line hidden
+#nullable disable
+    }
+}
+namespace __Blazor.Test.UseTestComponent
+{
+    #line hidden
+    internal static class TypeInference
+    {
+        public static void CreateTestComponent_0<TItem>(global::Microsoft.AspNetCore.Components.Rendering.RenderTreeBuilder __builder, int seq, int __seq0, TItem[] __arg0, int __seq1, global::System.Collections.Generic.List<TItem[]> __arg1, int __seq2, global::System.Func<TItem[]> __arg2, int __seq3, global::Microsoft.AspNetCore.Components.RenderFragment<TItem[]> __arg3)
+        {
+        __builder.OpenComponent<global::Test.TestComponent<TItem>>(seq);
+        __builder.AddAttribute(__seq0, "Items1", __arg0);
+        __builder.AddAttribute(__seq1, "Items2", __arg1);
+        __builder.AddAttribute(__seq2, "Items3", __arg2);
+        __builder.AddAttribute(__seq3, "ChildContent", __arg3);
+        __builder.CloseComponent();
+        }
+    }
+}
+#pragma warning restore 1591