MVC 全局异常捕获

/// <summary>
    /// 自定义全局异常捕获
    /// </summary>
    public class ExceptionHelper : FilterAttribute, IExceptionFilter
    {
        /// <summary>
        /// 实现 IExceptionFilter中的 OnException 方法
        /// </summary>
        /// <param name="filterContext"></param>
        public void OnException(ExceptionContext filterContext)
        {
            Exception ex = filterContext.Exception as Exception;
            if (ex != null)
            {
                filterContext.Controller.ViewBag.UrlRefer = filterContext.HttpContext.Request.UrlReferrer;
                LogHelper.Error("Filter捕获到未处理异常",ex);            
                //页面抛出异常信息
                filterContext.HttpContext.Response.Write(string.Format("系统捕捉到未处理的异常：{0}<br/>", ex.GetType().ToString()));
                filterContext.HttpContext.Response.Write("Filter 已进行错误处理。");
            }
            filterContext.ExceptionHandled = true;//设置异常已经处理
        }
    }

public static void RegisterGlobalFilters(GlobalFilterCollection filters)
        {
            filters.Add(new HandleErrorAttribute());
            filters.Add(new ExceptionHelper(), 1);//自定义的验证特性 ExceptionHelper
　　　　　}