Asp.net Web Api set response status code to number

问题:

In Asp.net Web Api, how do I set the status code of my response using an int or string, not the StatusCode enum?

In my case, I'd like to return validation errors with status code 422, "Unprocessable Entity", but there's no enumerator for it.

HttpResponseMessage response = Request.CreateResponse();
response.StatusCode = HttpStatusCode.UnprocessableEntity; //error, not in enum

回答1:

You can cast any int to a HttpStatusCode.

response.StatusCode = (HttpStatusCode)422;

You can also:

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

回答2:

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;