WebForm 在 Global.asax 中捕获全局异常

         /// <summary>
         /// 捕获全局异常
         /// </summary>
         /// <param name="sender">sender</param>
         /// <param name="e">e</param>
         protected void Application_Error(Object sender, EventArgs e)
         {
             Exception ex = Server.GetLastError().GetBaseException();
             string ip = Request.ServerVariables.Get("HTTP_X_FORWARDED_FOR") == null ?
                 Request.ServerVariables.Get("Remote_Addr").ToString().Trim() :
                 Request.ServerVariables.Get("HTTP_X_FORWARDED_FOR").ToString().Trim();
             string logpath = Server.MapPath("~/Log/" + DateTime.Now.ToString("yyyy-MM-dd") + ".txt");
             StringBuilder builder = new StringBuilder();
             builder.AppendLine(string.Format("==========  {0} Application_Error BEGIN ==========", DateTime.Now));
             builder.AppendLine("Ip:" + ip);
             builder.AppendLine("浏览器:" + Request.Browser.Browser.ToString());
             builder.AppendLine("浏览器版本:" + Request.Browser.MajorVersion.ToString());
             builder.AppendLine("操作系统:" + Request.Browser.Platform.ToString());
             builder.AppendLine("页面：" + Request.Url.ToString());
             builder.AppendLine("错误信息：" + ex.Message);
             builder.AppendLine("错误源：" + ex.Source);
             builder.AppendLine("异常方法：" + ex.TargetSite);
             builder.AppendLine("堆栈信息：" + ex.StackTrace);
             builder.AppendLine("==========  Application_Error END  ===================");

             lock (logpath)
             {
                 try
                 {
                     using (var writer = new StreamWriter(logpath, true))
                     {
                         writer.Write(builder.ToString());
                     }
                 }
                 catch
                 {
                     // 防止写文件时，文件被人为打开无法写入等
                     // 记录日志报错不做处理，不应影响用户继续使用
                 }
             }

             Server.ClearError();
             Response.Redirect("~/Error.htm");
         }