How can I create an application-wide 404 error page?

Question

In my ASP.Net MVC2, how do I create a wide 404 page?

Meaning every single time someone tries to enter a non-existent view/page, he's redirected to this error page of my choosing?

Answer 1

Use the standard ASP.NET error pages (activate in web.config):

<customErrors mode="On|RemoteOnly" defaultRedirect="/error/problem">
    <error statusCode="404" redirect="/error/notfound"/>
    <error statusCode="500" redirect="/error/problem"/>
</customErrors>

And/or create an error handling controller and use it with a catchall route:

ErrorController.cs:

public class ErrorController : Controller
{
    public ActionResult NotFound(string aspxerrorpath)
    {
        // probably you'd like to log the missing url. "aspxerrorpath" is automatically added to the query string when using standard ASP.NET custom errors
        // _logger.Log(aspxerrorpath); 
        return View();
    }
}

global.asax:

// This route catches all urls that do not match any of the previous routes.
// So if you registered the standard routes, somthing like "/foo/bar/baz" will
// match the "{controller}/{action}/{id}" route, even if no FooController exists
routes.MapRoute(
     "Catchall",
     "{*catchall}",
     new { controller = "Error", action = "NotFound" }
);