CreateResponse method in asp.net Web API

Question

calling this method:

public HttpResponseMessage PostProduct(Product item)
{
    item = repository.Add(item);
    var response = this.Request.CreateResponse<Product>CreateResponse(HttpStatusCode.Created, item);

    string uri = Url.RouteUrl("DefaultApi", new { id = item.Id });
    response.Headers.Location = new Uri(uri);
    return response;
}

Is causing a compile-time error:

'System.Web.HttpRequestBase' does not contain a definition for 'CreateResponse' and the
            best extension method overload 'System.Net.Http.HttpRequestMessageExtensions.CreateResponse<T>
(System.Net.Http.HttpRequestMessage, System.Net.HttpStatusCode, T)' has some invalid arguments.

What am I missing here?

Please include the class definition as well, for example, public ProductsController : ApiController { — danludwig
– danludwig, Commented Dec 20, 2012 at 12:12
OK. I think I got it. The class definition is: public class ProductsController : Controller — ronen
– ronen, Commented Dec 20, 2012 at 12:14

danludwig · Accepted Answer · 2014-10-07 17:02:31Z

26

The runtime type of item is probably not an instance of Product. You should be able to do this:

var response = Request.CreateResponse(HttpStatusCode.Created, item);

Even if item was an instance of Product, the generic <Product> argument is redundant and not necessary. If you used ReSharper, it would tell you that the "(Generic) Type argument specification is redundant".

Update

Does your class extend from Controller or ApiController? The error should be 'System.Net.Http.HttpRequestMessage' does not contain a definition for..., not 'System.Web.HttpRequestBase' does not contain a definition for....

WebApi controllers should extend from ApiController, not Controller. In an MVC controller, this.Request points to an instance of System.Web.HttpRequestBase. In a WebAPI controller, this.Request points to an instance of System.Net.Http.HttpRequestMessage.

edited Oct 7, 2014 at 17:02

answered Dec 20, 2012 at 11:59

danludwig

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1 Comment

mosess Over a year ago

whats for .net core?

Karanvir Kang · Accepted Answer · 2014-08-21 14:15:49Z

19

CreateResponse is an extension method defined in System.Net.Http namespace. Make sure to add a reference to System.Net.Http and System.Net.Http.Formatting in your project and add a correct using directive:

C#:
using System.Net.Http;

VB:
Import System.Net.Http

answered Aug 21, 2014 at 14:15

Karanvir Kang

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