How can I properly handle 404 in ASP.NET MVC?

Question

I am using RC2

Using URL Routing:

routes.MapRoute(
    \"Error\",
     \"{*url}\",
     new { controller = \"Errors\", action = \"N         


        

Answer 1

Adding my solution, which is almost identical to Herman Kan's, with a small wrinkle to allow it to work for my project.

Create a custom error controller:

public class Error404Controller : BaseController
{
    [HttpGet]
    public ActionResult PageNotFound()
    {
        Response.StatusCode = 404;
        return View("404");
    }
}

Then create a custom controller factory:

public class CustomControllerFactory : DefaultControllerFactory
{
    protected override IController GetControllerInstance(RequestContext requestContext, Type controllerType)
    {
        return controllerType == null ? new Error404Controller() : base.GetControllerInstance(requestContext, controllerType);
    }
}

Finally, add an override to the custom error controller:

protected override void HandleUnknownAction(string actionName)
{
    var errorRoute = new RouteData();
    errorRoute.Values.Add("controller", "Error404");
    errorRoute.Values.Add("action", "PageNotFound");
    new Error404Controller().Execute(new RequestContext(HttpContext, errorRoute));
}

And that's it. No need for Web.config changes.