How to get MVC action to return 404

Question

I have an action that takes in a string that is used to retrieve some data. If this string results in no data being returned (maybe because it has been deleted), I want to r

Answer 1

None of the above examples worked for me until I added the middle line below:

public ActionResult FourOhFour()
{
    Response.StatusCode = 404;
    Response.TrySkipIisCustomErrors = true; // this line made it work
    return View();
}

Answer 2

In NerdDinner eg. Try it

public ActionResult Details(int? id) {
    if (id == null) {
        return new FileNotFoundResult { Message = "No Dinner found due to invalid dinner id" };
    }
    ...
}

Answer 3

In .NET Core 1.1:

return new NotFoundObjectResult(null);

Answer 4

You can also do:

        if (response.Data.IsPresent == false)
        {
            return StatusCode(HttpStatusCode.NoContent);
        }

Answer 5

In ASP.NET MVC 3 and above you can return a HttpNotFoundResult from the controller.

return new HttpNotFoundResult("optional description");

Answer 6

I use:

Response.Status = "404 NotFound";

This works for me :-)