Thread.sleep代码VS Task.Delay？ [英] Thread.Sleep vs Task.Delay?

问题描述

我知道 Thread.sleep代码块一个线程。

但是否 Task.Delay 也阻止？还是只是像定时器，它使用一个线程用于所有的回调（当不重叠）？

But does Task.Delay also block? Or is it just like Timer which uses one thread for all callbacks (when not overlapping)?

（<一href="http://stackoverflow.com/questions/15341962/how-to-put-a-task-to-sleep-or-delay-in-c-sharp-4-0">this问题不包括差异）的

推荐答案

在MSDN上的文档是令人失望的，但反编译 Task.Delay 使用反射提供了更多的信息：

The documentation on MSDN is disappointing, but decompiling Task.Delay using Reflector gives more information:

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;
}

基本上，此方法是刚完成一个任务内的定时器。所以，是的，你可以说这就像计时器。

Basically, this method is just a timer wrapped inside of a task. So yes, you can say it's just like timer.

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