多线程程序写日志时遇到加锁的问题

   前段时间在做项目时，系统是个多线程程序，几个线程都需要写日志，主线程和通讯线程经常在写日志时打架，为了解决这个问题，考虑在写日志的方法中加锁。代码如下：

  　　 /// <summary>
        /// 写日志时加锁
        /// </summary>
        private static object m_Lock = new object();

        /// <summary>
        /// 写日志文件的接口函数,此函数只向指定的文件写入字符串

        /// </summary>
        /// <param name="DestFileName"></param>
        /// <param name="fmt"></param>
        /// <returns></returns>
        public static int TP_WriteAppLogFileEx(string DestFileName, string fmt)
        {
            string strLogFile = System.Environment.CurrentDirectory+"\\Log\\"+DateTime.Now.ToString("yyyyMMdd")+".log";
            if (strLogFile != DestFileName)
            {
                DestFileName = strLogFile;
            }
            int iWriteAppLogFile = 0;
            lock (m_Lock)
            {
                iWriteAppLogFile=TP_WriteAppLogFile(DestFileName, fmt);
            }
            return iWriteAppLogFile;
        }

 public static int TP_WriteAppLogFile(string DestFileName, string fmt)
        {
            try
            {
   FileInfo file = new FileInfo(DestFileName);

                if (!file.Exists)
                {
                    file.Create();
                }

                //定位到文件尾
                StreamWriter stream = file.AppendText();

                //写当前的时间
                stream.Write(DateTime.Now.ToString("HH:mm:ss fff "));

                //写用户传过来的字符串
                stream.WriteLine(fmt);

                //最后记着要关了它
                stream.Close(); 

            }
            catch (Exception e)
            {

            }

            return 0;
        }

经过加锁处理后，多线程写日志打架的问题得到了解决。