if (Server.GetLastError() != null)
            {
                Exception ex = Server.GetLastError().GetBaseException();
                string errorTime = "发生时间：" + DateTime.Now.ToString();
                string errorAddress = "发生异常页：" + Request.Url.ToString();
                string errorInfo = "异常信息：" + ex.Message;
                string errorSource = "错误源：" + ex.Source;
                string errorTrace = "堆栈信息：" + ex.StackTrace;
                Server.ClearError();

                System.IO.StreamWriter writer = null;
                try
                {
                    lock (this)
                    {
                        //写入日志
                        string year = DateTime.Now.Year.ToString();
                        string month = DateTime.Now.Month.ToString();
                        string day = DateTime.Now.Day.ToString();
                        string path = string.Empty;
                        string filename = DateTime.Now.ToString("yyyyMMdd") + ".txt";
                        path = Server.MapPath("~/Error/") + year + month + day;
                        if (!System.IO.Directory.Exists(path))
                        {
                            System.IO.Directory.CreateDirectory(path);
                        }
                        System.IO.FileInfo file = new FileInfo(path + "/" + filename);
                        writer = new StreamWriter(file.FullName, true);//文件不在则创建，true表示追加
                        writer.WriteLine("用户IP:" + Request.UserHostAddress);
                        writer.WriteLine(errorTime);
                        writer.WriteLine(errorAddress);
                        writer.WriteLine(errorInfo);
                        writer.WriteLine(errorSource);
                        writer.WriteLine(errorTrace);
                        writer.WriteLine("-------------------------------------------------------");

                    }
                }
                finally
                {
                    if (writer != null)
                    {
                        writer.Close();
                    }
                }
                Server.Transfer("/Index.aspx"); //跳转到显示友好错误的页面

            }