如何取消等待Task.Delay()? [英] How to cancel await Task.Delay()?

问题描述

如您在此代码中所见:

public async void TaskDelayTest()
{
     while (LoopCheck)
     {
          for (int i = 0; i < 100; i++)
          {
               textBox1.Text = i.ToString();
               await Task.Delay(1000);
          }
     }
}

我希望它在一秒钟内将文本框设置为字符串值i，直到将LoopCheck值设置为false为止.但是它的作用是为所有对象创建所有迭代对象，即使我将LoopCheck值设置为false，它仍然会异步执行它的操作.

I want it to set textbox to string value of i with one second period until I set LoopCheck value to false . But what it does is that it creates all iteration ones in for all and even if I set LoopCheck value to false it still does what it does asyncronously.

设置LoopCheck=false时，我想取消所有等待的Task.Delay()迭代.我该如何取消呢?

I want to cancel all awaited Task.Delay() iteration when I set LoopCheck=false. How can I cancel it?

推荐答案

使用

Use the overload of Task.Delay which accepts a CancellationToken

public async void TaskDelayTest(CancellationToken token)
{
    while (!token.IsCancellationRequested)
    {
        for (int i = 0; i < 100; i++)
        {
            textBox1.Text = i.ToString();
            await Task.Delay(1000, token);
        }
    }
}

var tokenSource = new CancellationTokenSource();
TaskDelayTest(tokenSource.Token);
...
tokenSource.Cancel();

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