Add TypedResults.Extentensions (#47285)

Make TypedResults more consistent with Results by adding extensions support. Extensions on Results.Extensions will also work on TypedResults.

Author: dnperfors

src/Http/Http.Extensions/test/RequestDelegateGenerator/RequestDelegateCreationTestBase.cs

@@ -250,6 +250,8 @@ public static IEndpointRouteBuilder MapTestEndpoints(this IEndpointRouteBuilder
         {{sources}}
         return app;
     }
+
+    public static IResult TestResult(this IResultExtensions _) => TypedResults.Text("Hello World!");
 }
 """;
     private static Task<Compilation> CreateCompilationAsync(string sources)

src/Http/Http.Extensions/test/RequestDelegateGenerator/RequestDelegateCreationTests.Responses.cs

@@ -1,5 +1,10 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
+using Microsoft.AspNetCore.Routing.Internal;
+using Microsoft.Extensions.ObjectPool;
+using Microsoft.Extensions.Primitives;
+using System.Text;
+
 namespace Microsoft.AspNetCore.Http.Generators.Tests;
 
 public abstract partial class RequestDelegateCreationTests
@@ -103,6 +108,31 @@ public async Task MapAction_NoParam_ComplexReturn(string source)
         await VerifyResponseBodyAsync(httpContext, expectedBody);
     }
 
+    public static IEnumerable<object[]> MapAction_NoParam_ExtensionResult_Data => new List<object[]>()
+    {
+        new object[] { """app.MapGet("/", () => Results.Extensions.TestResult());""" },
+        new object[] { """app.MapGet("/", () => TypedResults.Extensions.TestResult());""" }
+    };
+
+    [Theory]
+    [MemberData(nameof(MapAction_NoParam_ExtensionResult_Data))]
+    public async Task MapAction_NoParam_ExtensionResult(string source)
+    {
+        var expectedBody = """Hello World!""";
+        var (result, compilation) = await RunGeneratorAsync(source);
+        var endpoint = GetEndpointFromCompilation(compilation);
+
+        VerifyStaticEndpointModel(result, endpointModel =>
+        {
+            Assert.Equal("/", endpointModel.RoutePattern);
+            Assert.Equal("MapGet", endpointModel.HttpMethod);
+        });
+
+        var httpContext = CreateHttpContext();
+        await endpoint.RequestDelegate(httpContext);
+        await VerifyResponseBodyAsync(httpContext, expectedBody);
+    }
+
     public static IEnumerable<object[]>  MapAction_NoParam_TaskOfTReturn_Data => new List<object[]>()
     {
         new object[] { @"app.MapGet(""/"", () => Task.FromResult(""Hello world!""));", "Hello world!" },

src/Http/Http.Results/src/PublicAPI.Unshipped.txt

@@ -38,6 +38,7 @@ static Microsoft.AspNetCore.Http.TypedResults.Created<TValue>(System.Uri? uri, T
 *REMOVED*static Microsoft.AspNetCore.Http.TypedResults.Created<TValue>(string! uri, TValue? value) -> Microsoft.AspNetCore.Http.HttpResults.Created<TValue>!
 static Microsoft.AspNetCore.Http.TypedResults.CreatedAtRoute(string? routeName, Microsoft.AspNetCore.Routing.RouteValueDictionary? routeValues) -> Microsoft.AspNetCore.Http.HttpResults.CreatedAtRoute!
 static Microsoft.AspNetCore.Http.TypedResults.CreatedAtRoute<TValue>(TValue? value, string? routeName, Microsoft.AspNetCore.Routing.RouteValueDictionary? routeValues) -> Microsoft.AspNetCore.Http.HttpResults.CreatedAtRoute<TValue>!
+static Microsoft.AspNetCore.Http.TypedResults.Extensions.get -> Microsoft.AspNetCore.Http.IResultExtensions!
 static Microsoft.AspNetCore.Http.TypedResults.Json<TValue>(TValue? data, System.Text.Json.Serialization.JsonSerializerContext! context, string? contentType = null, int? statusCode = null) -> Microsoft.AspNetCore.Http.HttpResults.JsonHttpResult<TValue>!
 static Microsoft.AspNetCore.Http.TypedResults.Json<TValue>(TValue? data, System.Text.Json.Serialization.Metadata.JsonTypeInfo<TValue>! jsonTypeInfo, string? contentType = null, int? statusCode = null) -> Microsoft.AspNetCore.Http.HttpResults.JsonHttpResult<TValue>!
 static Microsoft.AspNetCore.Http.TypedResults.RedirectToRoute(string? routeName, Microsoft.AspNetCore.Routing.RouteValueDictionary? routeValues, bool permanent = false, bool preserveMethod = false, string? fragment = null) -> Microsoft.AspNetCore.Http.HttpResults.RedirectToRouteHttpResult!

src/Http/Http.Results/src/TypedResults.cs

@@ -1028,4 +1028,10 @@ public static AcceptedAtRoute<TValue> AcceptedAtRoute<TValue>(TValue? value, str
     /// Produces an empty result response, that when executed will do nothing.
     /// </summary>
     public static EmptyHttpResult Empty { get; } = EmptyHttpResult.Instance;
+
+    /// <summary>
+    /// Provides a container for external libraries to extend
+    /// the default `TypedResults` set with their own samples.
+    /// </summary>
+    public static IResultExtensions Extensions { get; } = new ResultExtensions();
 }