asp.net 在C盤建立 log.txt出錯

  在伺服器上，C盤一般是不允許通過WEB建立文檔的，除非你在使用權限設定中開啟，改為其他盤即可。

      public static void LOG(string msg = "")
        {
            try
            {
                 string path = "c:\\log.txt";

//                string path = @"c:\log.txt";

                if (System.IO.File.Exists(path) == false)
                    using (System.IO.FileStream writer = System.IO.File.Create(path))
                    {
                        writer.Close();
                    }
                using (System.IO.StreamWriter writer = System.IO.File.AppendText(path))
                {
                    writer.WriteLine(System.DateTime.Now.ToString("yyyy-MM-dd HH：mm：ss：ffff") + "->" + string.Concat(msg, Environment.NewLine));
                    writer.Close();
                }                string path = @"d:\log.txt";
                System.IO.StreamWriter writer;
                if (System.IO.File.Exists(path) == false)
                    writer = System.IO.File.CreateText(path);
                else
                    writer = System.IO.File.AppendText(path);               writer.WriteLine(System.DateTime.Now.ToString("yyyy-MM-dd HH：mm：ss：ffff") + "->" + string.Concat(msg, Environment.NewLine));
                writer.Close();

            }
            catch (System.Exception ex)
            {
                int i = 00;
            }
        }