Thread.Sleep(1000) 、Task.Delay(1000).Wait() 区别

public static Task Delay(int millisecondsDelay, CancellationToken cancellationToken){    if (millisecondsDelay < -1)    {        throw new ArgumentOutOfRangeException("millisecondsDelay", Environment.GetResourceString("Task_Delay_InvalidMillisecondsDelay"));    }    if (cancellationToken.IsCancellationRequested)    {        return FromCancellation(cancellationToken);    }    if (millisecondsDelay == 0)    {        return CompletedTask;    }    DelayPromise state = new DelayPromise(cancellationToken);    if (cancellationToken.CanBeCanceled)    {        state.Registration = cancellationToken.InternalRegisterWithoutEC(delegate (object state) {            ((DelayPromise) state).Complete();        }, state);    }    if (millisecondsDelay != -1)    {        state.Timer = new Timer(delegate (object state) {            ((DelayPromise) state).Complete();        }, state, millisecondsDelay, -1);        state.Timer.KeepRootedWhileScheduled();    }    return state;}

1、文章：https://code.msdn.microsoft.com/ThreadSleep-vs-TaskDelay-766b46b7

2、Thread.Sleep 是同步延迟。 Task.Delay异步延迟。

3、Thread.Sleep 会阻塞线程，Task.Delay不会。

4、Thread.Sleep不能取消，Task.Delay可以。

5、反编译Task.Delay，基本上讲它就是个包裹在任务中的定时器。