[release/9.0] Add explicit conversion for value-type returning handlers with filters

src/Http/Http.Extensions/src/RequestDelegateFactory.cs

@@ -543,6 +543,11 @@ private static Expression MapHandlerReturnTypeToValueTask(Expression methodCall,
             }
         }
 
+        if (returnType.IsValueType)
+        {
+            return Expression.Call(WrapObjectAsValueTaskMethod, Expression.Convert(methodCall, typeof(object)));
+        }
+
         return Expression.Call(WrapObjectAsValueTaskMethod, methodCall);
     }
 

src/Http/Http.Extensions/test/RequestDelegateFactoryTests.EndpointFilters.cs

@@ -0,0 +1,98 @@
+// 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.Http;
+using Microsoft.AspNetCore.InternalTesting;
+
+namespace Microsoft.AspNetCore.Routing.Internal;
+
+public partial class RequestDelegateFactoryTests : LoggedTest
+{
+    public static object[][] ValueTypeReturningDelegates =>
+    [
+        [(Func<HttpContext, int>)((HttpContext httpContext) => 42)],
+        [(Func<HttpContext, char>)((HttpContext httpContext) => 'b')],
+        [(Func<HttpContext, bool>)((HttpContext httpContext) => true)],
+        [(Func<HttpContext, float>)((HttpContext httpContext) => 4.2f)],
+        [(Func<HttpContext, double>)((HttpContext httpContext) => 4.2)],
+        [(Func<HttpContext, decimal>)((HttpContext httpContext) => 4.2m)],
+        [(Func<HttpContext, long>)((HttpContext httpContext) => 42)],
+        [(Func<HttpContext, short>)((HttpContext httpContext) => 42)],
+        [(Func<HttpContext, byte>)((HttpContext httpContext) => 42)],
+        [(Func<HttpContext, uint>)((HttpContext httpContext) => 42)],
+        [(Func<HttpContext, ulong>)((HttpContext httpContext) => 42)],
+        [(Func<HttpContext, ushort>)((HttpContext httpContext) => 42)],
+        [(Func<HttpContext, sbyte>)((HttpContext httpContext) => 42)]
+    ];
+
+    [Theory]
+    [MemberData(nameof(ValueTypeReturningDelegates))]
+    public void Create_WithEndpointFilterOnBuiltInValueTypeReturningDelegate_Works(Delegate @delegate)
+    {
+        var invokeCount = 0;
+
+        RequestDelegateFactoryOptions options = new()
+        {
+            EndpointBuilder = CreateEndpointBuilderFromFilterFactories(
+            [
+                (routeHandlerContext, next) =>
+                {
+                    invokeCount++;
+                    return next;
+                },
+                (routeHandlerContext, next) =>
+                {
+                    invokeCount++;
+                    return next;
+                },
+            ]),
+        };
+
+        var result = RequestDelegateFactory.Create(@delegate, options);
+        Assert.Equal(2, invokeCount);
+    }
+
+    public static object[][] NullableValueTypeReturningDelegates =>
+    [
+        [(Func<HttpContext, int?>)((HttpContext httpContext) => 42)],
+        [(Func<HttpContext, char?>)((HttpContext httpContext) => 'b')],
+        [(Func<HttpContext, bool?>)((HttpContext httpContext) => true)],
+        [(Func<HttpContext, float?>)((HttpContext httpContext) => 4.2f)],
+        [(Func<HttpContext, double?>)((HttpContext httpContext) => 4.2)],
+        [(Func<HttpContext, decimal?>)((HttpContext httpContext) => 4.2m)],
+        [(Func<HttpContext, long?>)((HttpContext httpContext) => 42)],
+        [(Func<HttpContext, short?>)((HttpContext httpContext) => 42)],
+        [(Func<HttpContext, byte?>)((HttpContext httpContext) => 42)],
+        [(Func<HttpContext, uint?>)((HttpContext httpContext) => 42)],
+        [(Func<HttpContext, ulong?>)((HttpContext httpContext) => 42)],
+        [(Func<HttpContext, ushort?>)((HttpContext httpContext) => 42)],
+        [(Func<HttpContext, sbyte?>)((HttpContext httpContext) => 42)]
+    ];
+
+    [Theory]
+    [MemberData(nameof(NullableValueTypeReturningDelegates))]
+    public void Create_WithEndpointFilterOnNullableBuiltInValueTypeReturningDelegate_Works(Delegate @delegate)
+    {
+        var invokeCount = 0;
+
+        RequestDelegateFactoryOptions options = new()
+        {
+            EndpointBuilder = CreateEndpointBuilderFromFilterFactories(
+            [
+                (routeHandlerContext, next) =>
+                {
+                    invokeCount++;
+                    return next;
+                },
+                (routeHandlerContext, next) =>
+                {
+                    invokeCount++;
+                    return next;
+                },
+            ]),
+        };
+
+        var result = RequestDelegateFactory.Create(@delegate, options);
+        Assert.Equal(2, invokeCount);
+    }
+}