Catch 404 Error in MVC4

Question

I have an problem cacting the HTTP Error 404.0 - Not Found. I have turned on the

<customErrors mode="On" defaultRedirect="~/Error/General">
      <error statusCode="404" redirect="~/Error/HttpError404" />
      <error statusCode="500" redirect="~/Error/HttpError500" />
    </customErrors>

in the Web.Config. But the problem still exist. I have also tried this solution( But it never reaches the method):

protected void Application_Error()
    {
      var exception = Server.GetLastError();
      var httpException = exception as HttpException;
      Response.Clear();
      Server.ClearError();
      var routeData = new RouteData();
      routeData.Values["controller"] = "Errors";
      routeData.Values["action"] = "General";
      routeData.Values["exception"] = exception;
      Response.StatusCode = 500;
      if (httpException != null)
      {
        Response.StatusCode = httpException.GetHttpCode();
        switch (Response.StatusCode)
        {
          case 403:
            routeData.Values["action"] = "HttpError404";
            break;
          case 404:
            routeData.Values["action"] = "HttpError404";
            break;
        }
      }

      IController errorsController = new ErrorController();
      var rc = new RequestContext(new HttpContextWrapper(Context), routeData);
      errorsController.Execute(rc);
    }

provided by @Darin Dimitrov

This is the controller:

public class ErrorController : Controller
  {

    public ActionResult HttpError404(string error)
    {
      ViewData["Title"] = "Sorry, an error occurred while processing your request. (404)";
      ViewData["Description"] = error;
      return View("Index");
    }

    public ActionResult HttpError500(string error)
    {
      ViewData["Title"] = "Sorry, an error occurred while processing your request. (500)";
      ViewData["Description"] = error;
      return View("Index");
    }


    public ActionResult General(string error)
    {
      ViewData["Title"] = "Sorry, an error occurred while processing your request.";
      ViewData["Description"] = error;
      return this.View();

    }

Answer 1

Okay i found an solution thanks to @alistair-findlay and this website. This is how the web.config looks like now:

<system.web>
    <customErrors mode="On" defaultRedirect="~/Error/General" redirectMode="ResponseRewrite"> 
        </customErrors>
 </system.web>
  <system.webServer>
<httpErrors errorMode="Detailed" defaultResponseMode="Redirect">
      <clear/>
      <error statusCode="404" path="/Error/HttpError404"/>
    </httpErrors>

  </system.webServer

And this is the Global.asax.cs:

  protected void Application_Error()
    {

      if (Context.IsCustomErrorEnabled)
        ShowCustomErrorPage(Server.GetLastError());

    }
    private void ShowCustomErrorPage(Exception exception)
    {
      var httpException = exception as HttpException ?? new HttpException(500, "Internal Server Error", exception);

      Response.Clear();
      var routeData = new RouteData();
      routeData.Values.Add("controller", "Error");
      routeData.Values.Add("fromAppErrorEvent", true);

      switch (httpException.GetHttpCode())
      {
        case 403:
          routeData.Values.Add("action", "HttpError403");
          break;

        case 404:
          routeData.Values.Add("action", "HttpError404");
          break;

        case 500:
          routeData.Values.Add("action", "HttpError500");
          break;

        default:
          routeData.Values.Add("action", "GeneralError");
          routeData.Values.Add("httpStatusCode", httpException.GetHttpCode());
          break;
      }

      Server.ClearError();

      IController controller = new ErrorController();
      controller.Execute(new RequestContext(new HttpContextWrapper(Context), routeData));
    }

And lastly:

 public class ErrorController : Controller
  {

    public ActionResult HttpError403(string error)
    {
      ViewBag.Description = error;
      return this.View();
    }