//开始事件
        protected override void OnStart(string[] args)
        {
             //定时事件
            MyTimer();
        }

        //结束事件
        protected override void OnStop()
        {
            writeLog("服务结束时间："  + DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss"));
        }

        //实例化System.Timers.Timer  
        private void MyTimer()
        {
            System.Timers.Timer MT = new System.Timers.Timer(30000);
            MT.Elapsed += new System.Timers.ElapsedEventHandler(MTimedEvent);
            MT.Enabled = true;

        }

        //构造System.Timers.Timer实例   间隔时间事件  
        private void MTimedEvent(object source, System.Timers.ElapsedEventArgs e)
        {

            //实现方法

        }