Asp.net Web Api set response status code to number

You can cast any int to a HttpStatusCode.

response.StatusCode = (HttpStatusCode)422;

You can also:

HttpResponseMessage response = Request.CreateResponse((HttpStatusCode)422, "Unprocessable Entity");

I ended up creating a class for this:

  public class HttpStatusCodeAdditions
    {
        public const int UnprocessableEntityCode = 422;
        public static HttpStatusCodeAdditions UnprocessableEntity = new HttpStatusCodeAdditions(UnprocessableEntityCode);

        private HttpStatusCodeAdditions(int code)
        {
            Code = code;
        }
        public int Code { get; private set; }

        public static implicit operator HttpStatusCode(HttpStatusCodeAdditions addition)
        {
            return (HttpStatusCode)addition.Code;
        }
    }

which can be used like this:

response.StatusCode = HttpStatusCodeAdditions.UnprocessableEntity;