如何在C＃4.0中使任务进入睡眠状态（或延迟）？

您可以使用在4.0中

Timer

Delay

public static Task Delay(double milliseconds){    var tcs = new TaskCompletionSource<bool>();    System.Timers.Timer timer = new System.Timers.Timer();    timer.Elapsed+=(obj, args) =>    {        tcs.TrySetResult(true);    };    timer.Interval = milliseconds;    timer.AutoReset = false;    timer.Start();    return tcs.Task;}