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

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。

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;
}


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