C#中精确计时的一点收获

原文地址：http://www.cnblogs.com/jintianhu/archive/2010/09/01/1815031.html

我的应用示例

    public static class ServerDateTime
    {
        static Stopwatch sw = new Stopwatch();
        static CommonPresenter presenter = new CommonPresenter();
        static DateTime LastCorrectTime = DateTime.Now;
        static DateTime _now;
        /// <summary>
        /// 服务器时间（可能会有网络延迟），如果服务器访问失败则为本地时间
        /// </summary>
        public static DateTime Now
        {
            get { return LastCorrectTime.Add(sw.Elapsed); }
            private set { _now = value; }
        }

        static ServerDateTime()
        {
            Now = DateTime.Now;
            GetServerDateTime(null);
            sw.Start();
        }

        static void GetServerDateTime(MethodInvoker callback)
        {
            presenter.RequestServerDateTime(serverdatetime =>
            {
                Now = serverdatetime;
                LastCorrectTime = serverdatetime;
                if (callback != null) callback();
            });
        }
    }