ASP.NET C＃句柄404错误（BAD url控制器名称）

Question

我有一个ASP.NET MVC5项目，当我写错控制器名称时需要处理404页面，例如上帝 /主页/关于 vs坏 /主页/关于

Global.asax.cs

protected void Application_Error(object sender, EventArgs e)
        {

            Exception exception = Server.GetLastError();

            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));

        }

如果我写错了动作我得到了一个错误页面（没关系），但是如果我写错了控制器名称我在浏览器上只得到了简单的html源代码（但是html代码有错误页面但是我在html中得到了文本而不是DOM对象浏览器）

ErrorController

        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 View("Index");
        }

THX很多