Windows高速定时器,多媒体定时器winmm.dll库的使用

 public sealed class MillisecondTimer : IComponent, IDisposable
    {
        //*****************************************************  字 段  *******************************************************************
        private static TimerCaps caps;
        private int interval;
        private bool isRunning;
        private int resolution;
        private TimerCallback timerCallback;
        private int timerID;

        //*****************************************************  属 性  *******************************************************************
        /// <summary>
        /// 
        /// </summary>
        public int Interval
        {
            get
            {
                return this.interval;
            }
            set
            {
                if ((value < caps.periodMin) || (value > caps.periodMax))
                {
                    throw new Exception("超出计时范围！");
                }
                this.interval = value;
            }
        }


        /// <summary>
        /// 
        /// </summary>
        public bool IsRunning
        {
            get
            {
                return this.isRunning;
            }
        }

        /// <summary>
        /// 
        /// </summary>
        public ISite Site
        {
            set;
            get;
        }

        //*****************************************************  事 件  *******************************************************************
        public event EventHandler Disposed;  // 这个事件实现了IComponet接口
        public event EventHandler Tick;
        //***************************************************  构造函数和释构函数  ******************************************************************

        static MillisecondTimer()
        {
            timeGetDevCaps(ref caps, Marshal.SizeOf(caps));
        }

        public MillisecondTimer()
        {
            this.interval = caps.periodMin;    // 
            this.resolution = caps.periodMin;  //
            this.isRunning = false;
            this.timerCallback = new TimerCallback(this.TimerEventCallback);
        }

        public MillisecondTimer(IContainer container)
            : this()
        {
            container.Add(this);
        }

        ~MillisecondTimer()
        {
            timeKillEvent(this.timerID);
        }

        //*****************************************************  方 法  *******************************************************************
        /// <summary>
        /// 
        /// </summary>
        public void Start()
        {
            if (!isRunning)
            {
                timerID = timeSetEvent(this.interval, this.resolution, this.timerCallback, 0, 1); // 间隔性地运行
                if (timerID == 0)
                {
                    throw new Exception("无法启动计时器");
                }
                isRunning = true;
            }
        }

        /// <summary>
        /// 
        /// </summary>
        public void Stop()
        {
            if (isRunning)
            {
                timeKillEvent(this.timerID);
                isRunning = false;
            }
        }

        /// <summary>
        /// 实现IDisposable接口
        /// </summary>
        public void Dispose()
        {
            timeKillEvent(this.timerID);
            GC.SuppressFinalize(this);
            Disposed?.Invoke(this, EventArgs.Empty);
        }

        //***************************************************  内部函数  ******************************************************************
        [DllImport("winmm.dll")]
        private static extern int timeSetEvent(int delay, int resolution, TimerCallback callback, int user, int mode);

        [DllImport("winmm.dll")]
        private static extern int timeKillEvent(int id);

        [DllImport("winmm.dll")]
        private static extern int timeGetDevCaps(ref TimerCaps caps, int sizeOfTimerCaps); 

        private void TimerEventCallback(int id, int msg, int user, int param1, int param2)
        {
            Tick?.Invoke(this, null);  // 引发事件
        }
        //***************************************************  内部类型  ******************************************************************

        private delegate void TimerCallback(int id, int msg, int user, int param1, int param2); // timeSetEvent所对应的回调函数的签名

        /// <summary>
        /// 定时器的分辨率（resolution）。单位是ms，毫秒？
        /// </summary>
        [StructLayout(LayoutKind.Sequential)]
        private struct TimerCaps
        {
            public int periodMin;
            public int periodMax;
        }
    }
}

 class Program
    {
        static Dictionary<string, int> dtList = new Dictionary<string, int>();
        static void Main(string[] args)
        {
            //var timer = new DoubleThreadTimer(100, 100);
            //timer.OnRunningCallback += Timer1_Tick;
            //timer.Start();

            var timer1 = new MillisecondTimer();
            timer1.Interval = 2;
            timer1.Tick += Timer1_Tick;
            timer1.Start();
            Console.ReadLine();
        }

        private static void Timer1_Tick(object sender, EventArgs e)
        {
            var dt = DateTime.Now;
            string dtStr = dt.ToString("yyyyMMdd HHmmss");
            if (dtList.ContainsKey(dtStr))
            {
                dtList[dtStr]++;
                if (dtList[dtStr] % 500 == 0)
                {                    
                    Console.WriteLine(dtStr + "--->" + dtList[dtStr]);
                    dtList.Remove(dtStr);
                } 
            }
            else
            {
                if (dtList.Count > 1)
                {
                    foreach (var item in dtList)
                    {
                        Console.WriteLine(item.Key + "--->" + item.Value); 
                    }
                    dtList.Clear();
                }
                dtList.Add(dtStr, 1);                
            }
        }
    }