Asp.net MVC 自定義錯誤頁面以及return HttpNotFound遇到的問題

今天在處理mvc 項目404和500頁面時，發現我以前比較喜歡用的Return HttpNotFound()沒有跳轉到我在webconfig中配置的自定義404頁面，而且也不會去執行Global中的Application_Error方法，經過一番查閱資料，發現這個問題得去想別的辦法去做，具體的做法有三種，如下：

1.放棄Return HttpNotFound()，適用throw new HttpException(404, "page not found");

2.讓所有的Controller繼承自BaseController,然后BaseController重寫HttpNotFound方法，代碼如下：

        protected override HttpNotFoundResult HttpNotFound(string statusDescription)
        {
            this.Response.StatusCode = 404;
            this.Response.TrySkipIisCustomErrors = true;
            Response.Clear();
            Response.Redirect("~/FileNotFound.html");
            Response.End();
            return null;
        }

3.使用Fliter來處理異常，代碼如下；

 public class CustomViewForHttpStatusResultFilter : IResultFilter, IExceptionFilter
    {
        string viewName;
        int statusCode;

        #region Ctor
        public CustomViewForHttpStatusResultFilter(HttpStatusCodeResult prototype, string viewName)
            : this(prototype.StatusCode, viewName)
        {
        }

        public CustomViewForHttpStatusResultFilter(int statusCode, string viewName)
        {
            this.viewName = viewName;
            this.statusCode = statusCode;
        } 
        #endregion

        public void OnResultExecuted(ResultExecutedContext filterContext)
        {
            HttpStatusCodeResult httpStatusCodeResult = filterContext.Result as HttpStatusCodeResult;
            //比較重要的一句，當請求完成后，發現
            if (httpStatusCodeResult != null && httpStatusCodeResult.StatusCode == statusCode)
            {
                ExecuteCustomViewResult(filterContext.Controller.ControllerContext);

            }
        }

        public void OnResultExecuting(ResultExecutingContext filterContext)
        {
        }

        public void OnException(ExceptionContext filterContext)
        {
            HttpException httpException = filterContext.Exception as HttpException;

            if (httpException != null && httpException.GetHttpCode() == statusCode)
            {
                ExecuteCustomViewResult(filterContext.Controller.ControllerContext);
                // This causes ELMAH not to log exceptions, so commented out
                //filterContext.ExceptionHandled = true;
            }
        }

        void ExecuteCustomViewResult(ControllerContext controllerContext)
        {
            ViewResult viewResult = new ViewResult();
            viewResult.ViewName = viewName;
            viewResult.ViewData = controllerContext.Controller.ViewData;
            viewResult.TempData = controllerContext.Controller.TempData;
            viewResult.ExecuteResult(controllerContext);
            controllerContext.HttpContext.Response.TrySkipIisCustomErrors = true;
        }
    }