How to cancel await Task.Delay()?

Question

As you can see in this code:

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

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.

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

Answer 1

Use the overload of Task.Delay which accepts a CancellationToken

public async Task TaskDelayTest(CancellationToken token) {     while (LoopCheck)     {         token.throwIfCancellationRequested();         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();