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() == 400 || httpException.GetHttpCode() == 404))
            {
                filterContext.HttpContext.Response.StatusCode = 404;
                filterContext.HttpContext.Response.Write("错误的请求路径");
                filterContext.HttpContext.Response.WriteFile("~/HttpError/404.html");
            }
            else
            {
                filterContext.HttpContext.Response.StatusCode = 500;
                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