具有取消功能的非同步作業參考範例

利用cancellationtokensource 和 cancellationtoken 類別

執行非同步作業

private async Task TryTask()

{

   CancellationTokenSource source = new CancellationTokenSource();

   source.CancelAfter(TimeSpan.FromSeconds(1)) ;

   Task<int> task = Task.Run(() => slowFunc(1, 2, source.Token), source.Token);

   await task;

}

定義欲以非同步方式執行的工作

private int slowFunc(int a, int b, CancellationToken cancellationToken)

{

   for (int i = 0;  i < 20000; i++))

      cancellationToken.ThrowIfCancellationRequested();

   return a + b;

}