MVC Filter自定义异常（拦截）

 // -----------------------------------------------------------------------
 //  <copyright file="CustomExceptionAttribute.cs" company="技术支持——谭明超">
 //      Copyright (c) 2016 QS.Web.Extensions. All rights reserved.
 //  </copyright>
 //  <last-editor>谭明超</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可获取错误信息

             /*
              * 1、根据对应的HTTP错误码跳转到错误页面
              * 2、这里对HTTP 404/400错误进行捕捉和处理
              * 3、其他错误默认为HTTP 500服务器错误
              */
             if (httpException != null && (httpException.GetHttpCode() ==  || httpException.GetHttpCode() == ))
             {
                 filterContext.HttpContext.Response.StatusCode = ;
                 filterContext.HttpContext.Response.Write("错误的请求路径");
                 filterContext.HttpContext.Response.WriteFile("~/HttpError/404.html");
             }
             else
             {
                 filterContext.HttpContext.Response.StatusCode = ;
                 filterContext.HttpContext.Response.Write("服务器内部错误");
                 filterContext.HttpContext.Response.WriteFile("~/HttpError/500.html");
             }
             /*---------------------------------------------------------
              * 这里可进行相关自定义业务处理，比如日志记录等
              ---------------------------------------------------------*/

             //设置异常已经处理,否则会被其他异常过滤器覆盖
             filterContext.ExceptionHandled = true;

             //在派生类中重写时，获取或设置一个值，该值指定是否禁用IIS自定义错误。
             filterContext.HttpContext.Response.TrySkipIisCustomErrors = true;
         }
     }
 }

该源码源自网上，，，，不记得哪里的了