Web Api Request.CreateResponse HttpResponseMessage no intellisense VS2012

Question

For some reason, Request.CreateResponse is now "red" in VS2012 and when I hover over the usage the IDE says

Cannot resolve symbol 'CreateResponse'

Here is the ApiController Class:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Web.Http;
using System.Web.Http.Filters;
using GOCApi.Attributes;
using GOCApi.Models;
using GOCApi.Models.Abstract;
using AttributeRouting;
using AttributeRouting.Web.Http;

namespace GOCApi.Controllers
{
    [RoutePrefix("Courses")]
    public class CoursesController : ApiController
    {
        private ICoursesRepository _coursesRepository { get; set; }

        public CoursesController(ICoursesRepository coursesRepository)
        {
            _coursesRepository = coursesRepository;
        }

        [GET("{id}")]
        public HttpResponseMessage Get(int id)
        {
            var course = _coursesRepository.GetSingle(id);
            if (course == null)
            return Request.CreateResponse(HttpStatusCode.NotFound, "Invalid ID");
            return Request.CreateResponse(HttpStatusCode.OK, course);
        }
    }
}

Granted, the code does compile and works, it's just really annoying seeing all the "red" on my screen. Also, the intellisense doesn't work now when I type Request.CreateResponse. This also used to work, but I started developing other parts to my API and just came back to building controllers so I do not know what happened.

Any thoughts?

Solution 1

You need to add a reference to System.Net.Http.Formatting.dll. The CreateResponse extension method is defined there.

Solution 2

Because this extension method lives in System.Net.Http, you just need to include it in your usings statements.

using System.Net.Http;

Solution 3

You can use

 HttpResponseMessage result = new HttpResponseMessage(HttpStatusCode.Gone)

instead of

 Request.CreateResponse(HttpStatusCode.Gone)

Solution 4

This is because you have to do:

namespace GOCApi.Controllers
{
    [RoutePrefix("Courses")]
    public class CoursesController : ApiController
    {
        private ICoursesRepository _coursesRepository { get; set; }

        public CoursesController(ICoursesRepository coursesRepository)
        {
            _coursesRepository = coursesRepository;
        }

        [GET("{id}")]
        public HttpResponseMessage Get(int id)
        {
            var course = _coursesRepository.GetSingle(id);
            if (course == null){
               return this.Request.CreateResponse(HttpStatusCode.NotFound, "Invalid ID");
            }
            return this.Request.CreateResponse(HttpStatusCode.OK, course);
        }
    }
}

Note the this.
In my case the compiler now gets it. Saw the example here

View more solutions

Comments

[von v.]

It happens a lot to me and the way it comes back is to close down VS and re-open it, annoyance that I have to live with, hope not for long.

[crizzwald]

@von v. I've tried that, no luck :/

[StingyJack]

Make sure the file build action property is set to "Compile" and not "Content".

[Linus Caldwell]

The OP did at line 5. Without it would not compile.

[Jappie Kerk]

This is actually quite weird, once I put down this it said I could remove it...

[cjones26]

iroel, it's probably because your controller is not deriving from ApiController.

[crthompson]

Base class originally was Controller in my auto created solution, once I changed it to ApiController suddenly the CreateResponse was found.

[Lukos]

You must reference the System.Net.Http.Formatting dll BUT the using is System.Net.Http. You need both.

[Rudy Scoggins]

Note that you will need a Using statement as well after adding the reference. This solved my issue.

[Majid ALSarra]

I think there's something wrong with this implementation. You are creating a response based on default values. Where here: msdn.microsoft.com/en-us/library/hh969014(v=vs.118).aspx it says the generated response from the request will be created "wired up" to the request.. I have no idea what "wired up" means :)

[SendETHToThisAddress]

Thanks! This helped me in a project where the implementation is not in a controller.