/// <summary>        ///  捕捉异常        /// </summary>        protected void Application_Error()        {            // 获得前一个异常的实例            var ex = Server.GetLastError().GetBaseException();            {                var sbError = new StringBuilder();                sbError.AppendFormat("Url OriginalString：{0}\r\n", Request.Url.OriginalString);                sbError.AppendFormat("URL PathAndQuery：{0}\r\n", Request.Url.PathAndQuery);                sbError.AppendFormat("URL.ToString()：{0}\r\n", Request.Url.ToString());                sbError.AppendFormat("URL AbsoluteUri：{0}\r\n", Request.Url.AbsoluteUri);                var query = (string.IsNullOrEmpty(Request.Url.Query) ? "" : "?" + Request.Url.Query);                sbError.AppendFormat("Query：{0}\r\n", query);                sbError.AppendFormat("发生时间：{0}\r\n", DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss ffff"));                sbError.AppendFormat("异常IP：{0}\r\n", PcHelper.GetInstance.GetIp());                sbError.AppendFormat("异常电脑名称：{0}\r\n", PcHelper.GetInstance.GetUserHostName());                sbError.AppendFormat("浏览器：{0}\r\n", PcHelper.GetInstance.GetBrowser());                var urlRefer = string.Empty;                if (Request.UrlReferrer != null)                {                    urlRefer = Request.UrlReferrer.OriginalString;                }                sbError.AppendFormat("URLRefer OriginalString：{0}\r\n", urlRefer);                sbError.AppendFormat("错误时间：{0}\r\n", DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss ffff"));                sbError.AppendFormat("错误文件：{0}\r\n", ex.Source);                sbError.AppendFormat("错误信息：{0}\r\n", ex.Message);                sbError.AppendFormat("引发错误的方法：{0}\r\n", ex.TargetSite);                sbError.AppendFormat("错误堆栈：{0}\r\n", ex.StackTrace);                // 将错误记录到日志中                FileHelper.GetInstance.WriteToFile(Server.MapPath(CommonConst.ErrorLogPath), sbError.ToString());            }        }