MVC Filter自定義異常（攔截）

// -----------------------------------------------------------------------
//  <copyright file="CustomExceptionAttribute.cs" company="技術支持——譚明超">
//      Copyright (c) 2016 QS.Web.Extensions. All rights reserved.
//  </copyright>
//  <last-editor>譚明超</last-editor>
//  <last-date>2016/8/2 20:56:16</last-date>
// -----------------------------------------------------------------------

using System;
using System.Web;
using System.Web.Mvc;

namespace QS.Web.Extensions
{
    public class CustomExceptionAttribute : FilterAttribute, IExceptionFilter
    {
        public void OnException(ExceptionContext filterContext)
        {
            Exception exception = filterContext.Exception;
            if (filterContext.ExceptionHandled == true)
            {
                return;
            }
            HttpException httpException = new HttpException(null, exception);
            //filterContext.Exception.Message可獲取錯誤信息

            /*
             * 1、根據對應的HTTP錯誤碼跳轉到錯誤頁面
             * 2、這里對HTTP 404/400錯誤進行捕捉和處理
             * 3、其他錯誤默認為HTTP 500服務器錯誤
             */
            if (httpException != null && (httpException.GetHttpCode() == 400 || httpException.GetHttpCode() == 404))
            {
                filterContext.HttpContext.Response.StatusCode = 404;
                filterContext.HttpContext.Response.Write("錯誤的請求路徑");
                filterContext.HttpContext.Response.WriteFile("~/HttpError/404.html");
            }
            else
            {
                filterContext.HttpContext.Response.StatusCode = 500;
                filterContext.HttpContext.Response.Write("服務器內部錯誤");
                filterContext.HttpContext.Response.WriteFile("~/HttpError/500.html");
            }
            /*---------------------------------------------------------
             * 這里可進行相關自定義業務處理，比如日志記錄等
             ---------------------------------------------------------*/

            //設置異常已經處理,否則會被其他異常過濾器覆蓋
            filterContext.ExceptionHandled = true;

            //在派生類中重寫時，獲取或設置一個值，該值指定是否禁用IIS自定義錯誤。
            filterContext.HttpContext.Response.TrySkipIisCustomErrors = true;
        }
    }
}

該源碼源自網上，，，，不記得哪里的了