Request.CreateErrorResponse 在哪里？

Question

I saw it in this blog post , but that doesn't actually say how to "enable" it. And it seems that by default it isn't enabled.

I know it's an extension method, as defined here:http://msdn.microsoft.com/en-us/library/hh835786(v=vs.108).aspx but how do I get access to it? If I type Request.CreateErrorResponse then the compiler doesn't recognize it.

I'm already using System.Net.Http .

Answer 1

I've noticed this in release version as well. And if you don't have the right using statement, it'll error. You need :

using System.Net.Http;

even if you already have this:

using System.Web.Http.Controllers;

Answer 2

Request is the public property of the ApiController class and should be available to you in any API actions in that controller.

public abstract class ApiController
{
   ...
   public HttpRequestMessage Request { get; set; }
}

Here is a small code sample that works for me:

using System.Net;
using System.Net.Http;
using System.Web.Http;


public class MyFirstApiController : ApiController
{
    // GET 
    public HttpResponseMessage Get(int id)
    {
        return Request.CreateErrorResponse(HttpStatusCode.ExpectationFailed, "Some   message here");
    }
}

Interestingly enough, if I take away using System.Net.Http; statement, Request no longer has a CreateErrorResponse() method.

Answer 3

Are you still using pre-release or release version? There were a number of extensions that did not appear until just before the release and did not exist in earlier versions of the webapi release. I am unsure if this was one of them, but it may be what is causing your problem.

Answer 4

Although important points have been answered.

One more dumbest possibility is that you might have chosen wrong type of controller. Make sure you have created an Web API controller , incase of MVC controller you cannot have

Request.CreateErrorResponse()

Just another possibility where you may find this issue.

Answer 5

In .net core, add Microsoft.AspNetCore.Mvc.WebApiCompatShim.dll .

https://docs.microsoft.com/en-us/dotnet/api/system.net.http.httprequestmessageextensions.createerrorresponse?view=aspnetcore-2.0

Answer 6

you can use from that In block Try-Catch.

 [HttpGet]
    public HttpResponseMessage DownloadVideo(Guid id, string title)
    {
        try
        {
          //Your Code at the end return result
        }
        catch (Exception ex)
        {
            return Request.CreateErrorResponse(HttpStatusCode.NotFound, ex.Message);
        }
    }

Answer 7

Use System.Web.Http assembly. source: CreateErrorResponse Method

Answer 8

Inject and instance of the HttpRequestMessage in your controller constructor or method:

Task<ActionResult> GetOne(HttpRequestMessage request,int shopId){

return request.CreateErrorResponse(.....) }

Answer 9

My best guess is that it is the third assembly, that you haven't referenced, that is the problem.

Unfortunately I don't have access to my computer, browsing on my phone, so I can't track down the file for you. According to the docs it should be in System.Web.Http.SelfHost.dll, so I guess you could just search for that file to locate it.