C# 停止使用 ThreadPool.QueueUserWorkItem 创建的具有特定任务的线程
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Stop Threads created with ThreadPool.QueueUserWorkItem that have a specific task
提问by maddo7
Let's say I queue those two methods in a forloop
假设我在for循环中将这两个方法排队
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);
});
}
Is there a way to stop all the threads that output Console.WriteLine("Output2");but keep the ones running that output Console.WriteLine("Output");?
有没有办法停止所有输出的线程Console.WriteLine("Output2");但保持那些运行该输出的线程Console.WriteLine("Output");？
采纳答案by jaket
You could use a CancellationToken:
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();
回答by Kiril
No, you can't do that. If you want to do something a long the lines then you must write some code to manage it. At the very basic level you need something like this:
不，你不能那样做。如果你想做一些很长的事情，那么你必须编写一些代码来管理它。在最基本的层面上，你需要这样的东西：
object syncObject = new object();
bool shouldOutput2 = true;
ThreadPool.QueueUserWorkItem(s =>
{
lock(syncObject)
{
if(!shouldOutput2)
{
return;
}
}
Console.WriteLine("Output2");
Thread.Sleep(1000);
});
Once you queue the items, then you can set the flag in order to tell the remaining items not to execute:
将项目排队后，您可以设置标志以告诉其余项目不要执行：
lock(syncObject)
{
shouldOutput2 = false;
}
This is a very dirty way of doing it, but it seems like the only way given your example. If you can tell us more about what is the actual real-world behavior you're trying to accomplish, then there could be some better options.
这是一种非常肮脏的方式，但在您的示例中，这似乎是唯一的方式。如果您能告诉我们更多关于您试图完成的实际现实行为是什么，那么可能会有一些更好的选择。
