Manual write code to record error log in .net by Global.asax

完整的Glabal.asax代碼:

<%@ Application Language="C#" %>

<script RunAt="server">

    void Application_Start(object sender, EventArgs e)
    {
        // 在應用程序啓動時運行的代碼

    }

    void Application_End(object sender, EventArgs e)
    {
        // 在應用程序關閉時運行的代碼

    }

    void Application_Error(object sender, EventArgs e)
    {
        // 在出現未處理的錯誤時運行的代碼
        Exception objErr = Server.GetLastError().GetBaseException();
        string error = string.Empty;
        string errortime = string.Empty;
        string erroraddr = string.Empty;
        string errorinfo = string.Empty;
        string errorsource = string.Empty;
        string errortrace = string.Empty;

        error += "發生時間:" + System.DateTime.Now.ToString() + "<br>";
        errortime = "發生時間:" + System.DateTime.Now.ToString();

        error += "發生異常頁: " + Request.Url.ToString() + "<br>";
        erroraddr = "發生異常頁: " + Request.Url.ToString();

        error += "異常信息: " + objErr.Message + "<br>";
        errorinfo = "異常信息: " + objErr.Message;
        //error +="錯誤源:"+objErr.Source+"<br>";
        //error += "堆棧信息:" + objErr.StackTrace + "<br>";
        errorsource = "錯誤源:" + objErr.Source;
        errortrace = "堆棧信息:" + objErr.StackTrace;
        error += "--------------------------------------<br>";
        Server.ClearError();
        Application["error"] = error;
        //獨佔方式，由於文件只能由一個進程寫入.
        System.IO.StreamWriter writer = null;
        try
        {
            lock (this)
            {
                // 寫入日誌
                string year = DateTime.Now.Year.ToString();
                string month = DateTime.Now.Month.ToString();
                string path = string.Empty;
                string filename = DateTime.Now.Day.ToString() + ".txt";
                path = Server.MapPath("~/Error/") + year + "/" + month;
                //若是目錄不存在則建立
                if (!System.IO.Directory.Exists(path))
                {
                    System.IO.Directory.CreateDirectory(path);
                }
                System.IO.FileInfo file = new System.IO.FileInfo(path + "/" + filename);
                //if (!file.Exists)
                //    file.Create();
                //file.Open(System.IO.FileMode.Append);        
                writer = new System.IO.StreamWriter(file.FullName, true);//文件不存在就建立,true表示追加
                writer.WriteLine("用戶IP:" + Request.UserHostAddress);
               // if (Session["Identity"] != null)
               // {
               //     writer.WriteLine("登陸賬號:" System.Web.HttpContext.Current.Session["Identity"]).YongHuInfo.ACCOUNTID);
               // }
                writer.WriteLine(errortime);
                writer.WriteLine(erroraddr);
                writer.WriteLine(errorinfo);
                writer.WriteLine(errorsource);
                writer.WriteLine(errortrace);
                writer.WriteLine("【this Error From http://hi.baidu.com/yanwei99521】");
                writer.WriteLine("--------------------------------------------------------------------------------------");
            }
        }
        finally
        {
            if (writer != null)
                writer.Close();

        }
        Response.Redirect("~/ErrorPageByPurview.aspx?ErrorCode=004");
    }

    void Session_Start(object sender, EventArgs e)
    {
        // 在新會話啓動時運行的代碼

    }

    void Session_End(object sender, EventArgs e)
    {
        // 在會話結束時運行的代碼。 
        // 注意: 只有在 Web.config 文件中的 sessionstate 模式設置爲
        // InProc 時，纔會引起 Session_End 事件。若是會話模式設置爲 StateServer 
        // 或 SQLServer，則不會引起該事件。

    }
       
</script>