13
11/2015
Thread.Sleep(1000) 、Task.Delay(1000).Wait() 区别（转）
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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