Use ProblemDetails.Status to configure ObjectResult.StatusCode

src/Mvc/Mvc.Core/src/DependencyInjection/ApiBehaviorOptionsSetup.cs

@@ -42,7 +42,10 @@ internal static IActionResult ProblemDetailsInvalidModelStateResponse(ProblemDet
             }
             else
             {
-                result = new ObjectResult(problemDetails);
+                result = new ObjectResult(problemDetails)
+                {
+                    StatusCode = problemDetails.Status,
+                };
             }
             result.ContentTypes.Add("application/problem+json");
             result.ContentTypes.Add("application/problem+xml");

src/Mvc/Mvc.Core/src/ObjectResult.cs

@@ -54,15 +54,22 @@ public virtual void OnFormatting(ActionContext context)
                 throw new ArgumentNullException(nameof(context));
             }
 
-            if (StatusCode.HasValue)
+            if (Value is ProblemDetails details)
             {
-                context.HttpContext.Response.StatusCode = StatusCode.Value;
-
-                if (Value is ProblemDetails details && !details.Status.HasValue)
+                if (details.Status != null && StatusCode == null)
+                {
+                    StatusCode = details.Status;
+                }
+                else if (details.Status == null && StatusCode != null)
                 {
-                    details.Status = StatusCode.Value;
+                    details.Status = StatusCode;
                 }
             }
+
+            if (StatusCode.HasValue)
+            {
+                context.HttpContext.Response.StatusCode = StatusCode.Value;
+            }
         }
     }
 }

src/Mvc/Mvc.Core/test/DependencyInjection/ApiBehaviorOptionsSetupTest.cs

@@ -7,6 +7,8 @@
 using Microsoft.AspNetCore.Http;
 using Microsoft.AspNetCore.Mvc;
 using Microsoft.AspNetCore.Mvc.Infrastructure;
+using Microsoft.AspNetCore.Mvc.ModelBinding;
+using Moq;
 using Xunit;
 
 namespace Microsoft.Extensions.DependencyInjection
@@ -70,6 +72,29 @@ public void ProblemDetailsInvalidModelStateResponse_UsesUserConfiguredLink()
             Assert.Equal(link, problemDetails.Type);
         }
 
+        [Fact]
+        public void ProblemDetailsInvalidModelStateResponse_UsesProblemDetailsFactory()
+        {
+            // Arrange
+            var actionContext = GetActionContext();
+            var factory = Mock.Of<ProblemDetailsFactory>(m => m.CreateValidationProblemDetails(It.IsAny<HttpContext>(), It.IsAny<ModelStateDictionary>(), null, null, null, null, null) == new ValidationProblemDetails
+            {
+                Status = 422,
+            });
+
+            // Act
+            var result = ApiBehaviorOptionsSetup.ProblemDetailsInvalidModelStateResponse(factory, actionContext);
+
+            // Assert
+            var objectResult = Assert.IsType<ObjectResult>(result);
+            Assert.Equal(422, objectResult.StatusCode);
+            Assert.Equal(new[] { "application/problem+json", "application/problem+xml" }, objectResult.ContentTypes.OrderBy(c => c));
+
+            var problemDetails = Assert.IsType<ValidationProblemDetails>(objectResult.Value);
+            Assert.Equal(422, problemDetails.Status);
+            Assert.Equal("One or more validation errors occurred.", problemDetails.Title);
+        }
+
         [Fact]
         public void ProblemDetailsInvalidModelStateResponse_SetsTraceId()
         {

src/Mvc/Mvc.Core/test/ObjectResultTests.cs

@@ -94,6 +94,68 @@ public async Task ObjectResult_ExecuteResultAsync_SetsProblemDetailsStatus()
             Assert.Equal(StatusCodes.Status422UnprocessableEntity, details.Status.Value);
         }
 
+        [Fact]
+        public async Task ObjectResult_ExecuteResultAsync_GetsStatusCodeFromProblemDetails()
+        {
+            // Arrange
+            var details = new ProblemDetails { Status = StatusCodes.Status413RequestEntityTooLarge, };
+
+            var result = new ObjectResult(details)
+            {
+                Formatters = new FormatterCollection<IOutputFormatter>()
+                {
+                    new NoOpOutputFormatter(),
+                },
+            };
+
+            var actionContext = new ActionContext()
+            {
+                HttpContext = new DefaultHttpContext()
+                {
+                    RequestServices = CreateServices(),
+                }
+            };
+
+            // Act
+            await result.ExecuteResultAsync(actionContext);
+
+            // Assert
+            Assert.Equal(StatusCodes.Status413RequestEntityTooLarge, details.Status.Value);
+            Assert.Equal(StatusCodes.Status413RequestEntityTooLarge, result.StatusCode.Value);
+            Assert.Equal(StatusCodes.Status413RequestEntityTooLarge, actionContext.HttpContext.Response.StatusCode);
+        }
+
+        [Fact]
+        public async Task ObjectResult_ExecuteResultAsync_ResultAndProblemDetailsHaveStatusCodes()
+        {
+            // Arrange
+            var details = new ProblemDetails { Status = StatusCodes.Status422UnprocessableEntity, };
+
+            var result = new BadRequestObjectResult(details)
+            {
+                Formatters = new FormatterCollection<IOutputFormatter>()
+                {
+                    new NoOpOutputFormatter(),
+                },
+            };
+
+            var actionContext = new ActionContext()
+            {
+                HttpContext = new DefaultHttpContext()
+                {
+                    RequestServices = CreateServices(),
+                }
+            };
+
+            // Act
+            await result.ExecuteResultAsync(actionContext);
+
+            // Assert
+            Assert.Equal(StatusCodes.Status422UnprocessableEntity, details.Status.Value);
+            Assert.Equal(StatusCodes.Status400BadRequest, result.StatusCode.Value);
+            Assert.Equal(StatusCodes.Status400BadRequest, actionContext.HttpContext.Response.StatusCode);
+        }
+
         private static IServiceProvider CreateServices()
         {
             var services = new ServiceCollection();