任务从取消标记？ [英] Task from cancellation token?

问题描述

由于取消的道理，我想创建一个awaitable任务了吧，这是从来没有完成，但可以取消。我需要它这样的模式，这IMO应该是很常见的：

Given a cancellation token, I'd like to create an awaitable task out of it, which is never complete but can be cancelled. I need it for a pattern like this, which IMO should be quite common:

async Task DoStuff(Task t, CancellationToken ct)
{
   // t was made from TaskCompletionSource, 
   // both t and ct are beyond my control

   Task t2 = TaskFromCancellationToken(ct);
   await Task.WhenAny(t, t2);

   // do stuff
}

我有迄今为止最好的办法是这样的：

The best idea I've got so far is this:

Task TaskFromCancelationToken(CancellationToken ct)
{
    return Task.Delay(Timeout.Infinite, ct);
}

有没有更好的办法，使这个逻辑发生的呢？

Is there a better way to make this logic happen?

推荐答案

这不是的非常的普遍，但它通常足以成为我的 AsyncEx 库。我使用的<一个href="https://github.com/StephenCleary/AsyncEx/blob/master/Source/Nito.AsyncEx%20(NET45%2C%20Win8%2C%20WP8%2C%20WPA81)/CancellationTokenExtensions.cs"相对=nofollow>像这：

It's not extremely common, but it's common enough to be part of my AsyncEx library. I use something like this:

public static Task AsTask(this CancellationToken cancellationToken)
{
    var tcs = new TaskCompletionSource();
    cancellationToken.Register(() => tcs.TrySetCanceled(),
        useSynchronizationContext: false);
    return tcs.Task;
}

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