在ASP.NET MVC中返回404时创建自定义错误

public class ErrorController : Controller
{
    public ActionResult NotFound()
    {
        Response.StatusCode = 404;
        return View();
    }
}

@{
    ViewBag.Title = "Page Not Found";
    Layout = "~/Views/Shared/_Layout.cshtml";
}

<h2>Page Not Found</h2>
<p>The requested page could not be found.</p>

protected void Application_Start()
{
    // ...

    RouteConfig.RegisterRoutes(RouteTable.Routes);

    // ...
}

public class RouteConfig
{
    public static void RegisterRoutes(RouteCollection routes)
    {
        // ...

        routes.MapRoute(
            name: "NotFound",
            url: "{*url}",
            defaults: new { controller = "Error", action = "NotFound" }
        );

        // ...
    }
}