小笔记：Timer定时间隔时间操作

小笔记：Timer定时间隔时间操作，后面有时间再补充和完善：

public class TimingSvc
    {
        /// <summary>
        /// 定时器，执行定时任务
        /// </summary>
        private static Timer m_Timer;
        static ReaderWriterLockSlim rwLock = new ReaderWriterLockSlim();
        private static int FlushTimeOut = 5000;
        private TimingSvc()
        {
               //初始化操作      
            TimeSpan timeSpan = new TimeSpan(20000);
            DateTime nextTime = DateTime.Now.AddMilliseconds(20000);
            timeSpan = nextTime.Subtract(DateTime.Now);
            m_Timer = new Timer(new TimerCallback(OnTimedEvent), null, (long)timeSpan.TotalMilliseconds, Timeout.Infinite);                      
        }
        
        public void Close()
        {
            m_log.LogEvent("定时任务停止.");
            m_Timer.Dispose();
        }
        
        /// <summary>
        /// 定时任务的执行
        /// </summary>
        protected void OnTimedEvent(object state)
        {
            //LogEvent("********开始执行定时任务********");
            //开始执行，无限等待
            m_Timer.Change(Timeout.Infinite, Timeout.Infinite);

            //执行任务逻辑,刷新数据
            //TODO
            
            //下次间隔20s执行
            DateTime nextTime = DateTime.Now.AddMilliseconds(20000);
            TimeSpan timeSpan = nextTime.Subtract(DateTime.Now);
            m_Timer.Change((long)timeSpan.TotalMilliseconds, Timeout.Infinite);
            return;
        }

        public void DoOperation()
        {            
            //写入加锁
            if (rwLock.TryEnterWriteLock(FlushTimeOut))
            {
                try
                {
                     //TODO BLL
                }
                catch (Exception ex)
                {
                    LogError("赋值异常：" + ex.Message);
                }
                finally
                {
                    rwLock.ExitWriteLock();
                }
            }
            return;
        }        
    }

 待完善。。。。。。