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

In MVC 4 and above you can use the built-in HttpNotFound helper methods:

if (notWhatIExpected)
{
    return HttpNotFound();
}

or

if (notWhatIExpected)
{
    return HttpNotFound("I did not find message goes here");
}

Answer 2

I've used this:

Response.StatusCode = 404;
return null;

Answer 3

There are multiple ways to do it,

1. You are right in common aspx code it can be assigned in your specified way
2. throw new HttpException(404, "Some description");

Answer 4

If you are working with .NET Core, you can return NotFound()

Answer 5

Code :

if (id == null)
{
  throw new HttpException(404, "Your error message");//RedirectTo NoFoundPage
}

Web.config

<customErrors mode="On">
  <error statusCode="404" redirect="/Home/NotFound" />
</customErrors>

Answer 6

Please try the following demo code:

public ActionResult Test()

{
　　return new HttpStatusCodeResult (404,"Not found");
}