c# - 停止使用 ThreadPool.QueueUserWorkItem 创建的具有特定任务的线程

Question

假设我将这两个方法排入 for 循环

for (int i = 0; i < 100; i++)
{
    ThreadPool.QueueUserWorkItem(s =>
    {
        Console.WriteLine("Output");
        Thread.Sleep(1000);
    });
}

for (int i = 0; i < 100; i++)
{
    ThreadPool.QueueUserWorkItem(s =>
    {
        Console.WriteLine("Output2");
        Thread.Sleep(1000);
    });
}

有没有一种方法可以停止所有输出 Console.WriteLine("Output2"); 的线程，但让那些运行该输出的线程 Console.WriteLine("Output"); ?

Answer 1

您可以使用 CancellationToken:

for (int i = 0; i < 100; i++)
{
    ThreadPool.QueueUserWorkItem(s =>
    {
        Console.WriteLine("Output");
        Thread.Sleep(1000);
    });
}

CancellationTokenSource cts = new CancellationTokenSource();

for (int i = 0; i < 100; i++)
{
    ThreadPool.QueueUserWorkItem(s =>
    {
        CancellationToken token = (CancellationToken) s;
        if (token.IsCancellationRequested)
            return;
        Console.WriteLine("Output2");
        token.WaitHandle.WaitOne(1000);
    }, cts.Token);
}

cts.Cancel();