HOW TO HANDLE 404 IN ASP.NET MVC?

Royce Roy

Total Post:149

Points:1043
Posted by  Royce Roy
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I am just getting started on ASP.NET MVC so bear with me. I've searched around this site and various others and have seen a few implementations of this.

EDIT: I forgot to mention I am using RC2

Using URL Routing:

routes.MapRoute(

    "Error",

     "{*url}",

     new { controller = "Errors", action = "NotFound" }  // 404s

);

The above seems to take care of requests like this (assuming default route tables setup by initial MVC project): "/blah/blah/blah/blah"

Overriding HandleUnknownAction() in the controller itself:

// 404s - handle here (bad action requested

protected override void HandleUnknownAction(string actionName) {

    ViewData["actionName"] = actionName;

    View("NotFound").ExecuteResult(this.ControllerContext);

However the previous strategies do not handle a request to a Bad/Unknown controller. For example, I do not have a "/IDoNotExist", if I request this I get the generic 404 page from the web server and not my 404 if I use routing + override.

So finally, my question is: Is there any way to catch this type of request using a route or something else in the MVC framework itself?

OR should I just default to using Web.Config customErrors as my 404 handler and forget all this? I assume if I go with customErrors I'll have to store the generic 404 page outside of /Views due to the Web.Config restrictions on direct access. Anyway any best practices or guidance is appreciated.

  1. ben reitman

    Post:96

    Points:676
    Re: How to handle 404 in ASP.NET MVC?

    Here's how I handle http exceptions:

    protected void Application_Error(object sender, EventArgs e)

    {

       Exception exception = Server.GetLastError();

       // Log the exception.

     

       ILogger logger = Container.Resolve<ILogger>();

       logger.Error(exception);

     

       Response.Clear();

     

       HttpException httpException = exception as HttpException;

     

       RouteData routeData = new RouteData();

       routeData.Values.Add("controller", "Error");

     

       if (httpException == null)

       {

           routeData.Values.Add("action", "Index");

       }

       else //It's an Http Exception, Let's handle it.

       {

           switch (httpException.GetHttpCode())

           {

              case 404:

                  // Page not found.

                  routeData.Values.Add("action", "HttpError404");

                  break;

              case 500:

                  // Server error.

                  routeData.Values.Add("action", "HttpError500");

                  break;

     

               // Here you can handle Views to other error codes.

               // I choose a General error template 

               default:

                  routeData.Values.Add("action", "General");

                  break;

          }

      }          

     

      // Pass exception details to the target error View.

      routeData.Values.Add("error", exception);

     

      // Clear the error on server.

      Server.ClearError();

     

      // Avoid IIS7 getting in the middle

      Response.TrySkipIisCustomErrors = true;

     

      // Call target Controller and pass the routeData.

      IController errorController = new ErrorController();

      errorController.Execute(new RequestContext(   

           new HttpContextWrapper(Context), routeData));

    }

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