利用Global.aspx添加错误日志

　　先在web站点下新建一个ErrorLog文件夹，用来存放错误日志。

　　然后新建一个Global.aspx。在Application_Error事件中输入处理代码

 

protected void Application_Error(object sender, EventArgs e)
        {

            Exception ex = Server.GetLastError();
            string errorMSG = ex.Message;
            string error = string.Empty;
            string errortime = string.Empty;
            string erroraddr = string.Empty;
            string errorinfo = string.Empty;
            string errorsource = string.Empty;
            string errortrace = string.Empty;
            errortime = "发生时间:" + System.DateTime.Now.ToString();
            erroraddr = "发生异常页: " + HttpContext.Current.Request.Url.ToString();
            errorinfo = "异常信息: " + ex.Message;
            errorsource = "错误源:" + ex.Source;
            errortrace = "堆栈信息:" + ex.StackTrace;
            //独占方式，因为文件只能由一个进程写入.
            System.IO.StreamWriter writer = null;
            try
            {
                lock (this)
                {
                    string FileName = DateTime.Now.ToShortDateString()+".txt";
                    string Year = DateTime.Now.Year.ToString();
                    string Month = DateTime.Now.Month.ToString();
                    string path = HttpContext.Current.Server.MapPath("~/ErrorLog/") + Year + "/" + Month;
                    //如果目录不存在则创建
                    if (!System.IO.Directory.Exists(path))
                    {
                        System.IO.Directory.CreateDirectory(path);
                    }
                    System.IO.FileInfo file = new System.IO.FileInfo(path + "/" + FileName);
                    writer = new System.IO.StreamWriter(file.FullName, true);//文件不存在就创建,true表示追加
                    writer.WriteLine("用户IP:" + HttpContext.Current.Request.UserHostAddress);
                    writer.WriteLine(errortime);
                    writer.WriteLine(erroraddr);
                    writer.WriteLine(errorinfo);
                    writer.WriteLine(errorsource);
                    writer.WriteLine(errortrace);
                    writer.WriteLine("--------------------------------------------------------------------------------------");
                    //writer.Close();
                }
            }
            finally
            {
                if (writer != null)
                    writer.Close();
            }

        }