How do I return NotFound() IHttpActionResult with an error message or exception?

Question

I am returning a NotFound IHttpActionResult, when something is not found in my WebApi GET action. Along with this response, I want to send a custom message and/

Answer 1

You may use ReasonPhrase property of HttpResponseMessage class

catch (Exception exception)
{
  throw new HttpResponseException(new HttpResponseMessage(HttpStatusCode.NotFound)
  {
    ReasonPhrase = exception.Message
  });
}