有没有办法检查 .NET 线程池中正在运行的内容？

发布于 2024-08-23 03:31:53 字数 661 浏览 6 评论 0原文

通常，我会为每个我想要执行多线程的操作创建每个线程。我是这样做的：

private Thread threadForWycena;

private void someMethod() {
       threadForWycena = new Thread(globalnaWycena);
       threadForWycena.Start();
}

然后，当用户想要关闭其中一个 gui 时，我正在检查该线程，如果它处于打开状态，我将不允许关闭它。

    private void ZarzadzajOplatamiGlobalneDzp_FormClosing(object sender, FormClosingEventArgs e)
    {
        if (threadForWycena.IsAlive) {
            MessageBox.Show("Wycena jest w toku. Zamknięcie okna jest niemożliwe.", "Brak wyjścia :-)");
            e.Cancel = true;
        }
    }

有没有办法使用 ThreadPool 来做到这一点，以便我可以防止窗口关闭，并且可以告诉用户哪个线程仍然存在以及它在做什么？

原文

Normally i was creating each thread per action i wanted to do multithreaded. I was doing it like that:

private Thread threadForWycena;

private void someMethod() {
       threadForWycena = new Thread(globalnaWycena);
       threadForWycena.Start();
}

Then when user wanted to close one of the gui's i was checking for this thread and if it was on i was dissalowing to close it.

    private void ZarzadzajOplatamiGlobalneDzp_FormClosing(object sender, FormClosingEventArgs e)
    {
        if (threadForWycena.IsAlive) {
            MessageBox.Show("Wycena jest w toku. Zamknięcie okna jest niemożliwe.", "Brak wyjścia :-)");
            e.Cancel = true;
        }
    }

Is there a way to do it using ThreadPool, so that i can prevent window closing and i can tell user which thread is still alive and what's it's doing?

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oО清风挽发oО 2024-08-30 03:31:53

在 .NET 中，没有直接的方法可以检测线程池工作项何时完成。不过，添加一个并不难。

创建一个 ManualResetEvent
在工作项结束时设置此事件。
要检查工作项是否已完成，请对事件执行零超时等待以查看它是否已设置。

例如（使用 lambda 关闭事件并避免修改要在线程池中运行的代码）：

var e = new ManualResetEvent(false); // false => not set to sart
ThreadPool.QueueUserWorkItem(_ => { FunctionToCall(); e.Set(); });
// Continue concurrently....
if (e.WaitOne(0)) {
  // The work item has completed
}

顺便说一句，在 .NET 4 中，Task 类（和子类型）提供了更丰富的模型来在线程池中运行代码，包括能够直接返回结果，或继续另一项任务。

There is no direct way to detect when a thread pool work item has completed in .NET. However it is not hard to add one.

Create a ManualResetEvent
At the end of the work item set this event.
To check if the work item has completed perform a zero timeout wait on the event to see if it has been set.

E.g. (using a lambda to close over the event and avoid modifying the code to run in the threadpool):

var e = new ManualResetEvent(false); // false => not set to sart
ThreadPool.QueueUserWorkItem(_ => { FunctionToCall(); e.Set(); });
// Continue concurrently....
if (e.WaitOne(0)) {
  // The work item has completed
}

By the way, in .NET 4 the Task class (and subtypes) provides a much richer model to run code in the threadpool, including ability to directly return results, or continue with another task.

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