In the previous blog exploring the cancellation Task _c # _ Huangteng Xiao's blog -CSDN blog describes task.run need to take the initiative to call during execution method ThrowIfCancellationRequested () to cancel, this time we study other cases of cancellation scene
Task .Delay
We know that Task.Dealythere is a heavy load can be passed CancellationToken, we make the following experiment
static void Main(string[] args)
{
var source = new CancellationTokenSource();
Foo(source.Token);
Thread.Sleep(TimeSpan.FromSeconds(3));
source.Cancel();
Console.WriteLine("取消任务");
Console.ReadLine();
}
public static void Foo(CancellationToken token)
{
Task.Delay(TimeSpan.FromSeconds(5), token)
.ContinueWith(task => Console.WriteLine(task.Status));
}
And similar experiments before, only Task.Runreplaced Task.Delay. The results shown in FIG.
Visible Task.Delaydirect response canceled
Parallel
Again we Paralleldo experiments
static void Main(string[] args)
{
var source = new CancellationTokenSource();
Foo(source.Token);
Thread.Sleep(TimeSpan.FromSeconds(3));
source.Cancel();
Console.WriteLine("取消任务");
Console.ReadLine();
}
public static void Foo(CancellationToken token)
{
var options = new ParallelOptions()
{
CancellationToken = token,
};
Task.Run(() =>
{
Parallel.For(0, 10, options, (i, state) =>
{
Console.WriteLine($"{i}任务开始");
Thread.Sleep(TimeSpan.FromSeconds(5));
Console.WriteLine($"{i}任务结束");
});
});
}
By Parallel.Forcreate 10 parallel tasks, each task takes 5 seconds to cancel the task for the first three seconds. The results shown in FIG.
Visible Parallel.Forbehavior and Task.Runis consistent
Reference links:
-
Task explore cancellation _c # _ Huangteng Xiao's blog -CSDN blog
-
How to: Use Parallel.Invoke to Execute Parallel Operations - Microsoft Docs
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