C# 如何在Windows 10 20H1及更高版本上更改setWaitableTimer精度

Windows 10 20H1（）中的计时器分辨率似乎有所改变

如果您想使用sleep（），那么仍然可以通过使用timeBeginPeriod（）函数获得合理的精度。这种方法似乎不适用于等待计时器。有人知道如何提高计时器的准确性吗

这是我正在使用的测试程序的摘录

// class Results omitted for clarity - it sums the duration calls to timerCallback() and divides it by the number of times it was called.

   class Program
    {
        static Results m_Results = new Results();

        // Windows API function imports
        [DllImport("winmm.dll", EntryPoint = "timeBeginPeriod", SetLastError = true)]
        public static extern uint TimeBeginPeriod(uint uMilliseconds);
        [DllImport("winmm.dll", EntryPoint = "timeEndPeriod", SetLastError = true)]
        public static extern uint TimeEndPeriod(uint uMilliseconds);
        [DllImport("kernel32.dll")]
        public static extern SafeWaitHandle CreateWaitableTimer(IntPtr lpTimerAttributes, bool bManualReset, string lpTimerName);

        [DllImport("kernel32.dll", SetLastError = true)]
        [return: MarshalAs(UnmanagedType.Bool)]
        public static extern bool SetWaitableTimer(SafeWaitHandle hTimer, [In] ref long pDueTime, int lPeriod, CallBack pfnCompletionRoutine, IntPtr lpArgToCompletionRoutine, bool fResume);
        // callback definition
        public delegate bool CallBack(IntPtr lpArg, int dwTimerLowValue, int dwTimerHighValue);


        // Main method, run when the application is run
        static void Main(string[] args)
        {
            SafeWaitHandle handle = CreateWaitableTimer(IntPtr.Zero, false, "MyWaitabletimer");
            CallBack myCallBack = new CallBack(Program.timerCallback);  // This function records the time its executed in a global list
            const int period = 40;              // Fire the timer every 40 mS
            long duetime = period * -10000;     // Keep firing the timer for 4 seconds
            TimeBeginPeriod(1);                 // *** This call appears to make no difference.
            SetWaitableTimer(handle, ref duetime, period, myCallBack, IntPtr.Zero, false);
            TimeEndPeriod(1);                   // *** This call appears to make no difference.

            Thread.Sleep(4000);
            Console.WriteLine("count = {0}", m_Results.getCount());
            Console.WriteLine("total duration = {0}", m_Results.getTotalDuration());
            Console.WriteLine("average = {0}", m_Results.getResults());
            Console.WriteLine("Tests complete");
            Console.ReadKey();
        }
        public static bool timerCallback(IntPtr lpArg, int dwTimerLowValue, int dwTimerHighValue)
        {
            m_Results.addDifference(DateTime.Now.Millisecond);    
            return true;
        }

---

当我运行代码时，我得到的计数是84、85或86，总持续时间

TimeEndPeriod（1）可能放在末尾？另外，您是否尝试过创建可等待的计时器高分辨率

我实际上没有考虑TimeEndPeriod的位置，我在最后尝试过（在GetKey调用之后，不幸的是没有任何更改。我刚刚尝试使用hi res标志，这也没有什么区别。如果尝试

period=1

，会发生什么？线程1计数=256总持续时间=4983平均值=19.46484375测试complete@CodeGorilla“我尝试C++中的代码，但是……”您应该张贴代码，或者删除C++标签。