等待 QueueUserWorkItem 完成 [英] Wait for QueueUserWorkItem to Complete

问题描述

如果我使用 QueueUserWorkItem 将作业添加到线程池中...如何在所有作业完成之前阻止我的程序继续运行?

If I add jobs to the thread pool with QueueUserWorkItem... how do I keep my program from going forward until all jobs are completed?

我知道我可以添加一些逻辑来阻止应用程序运行，直到所有作业完成，但我想知道是否有类似 Thread.Join() 的东西，或者是否有任何方法可以检索正在分配作业的每个线程.

I know I could add some logic to keep the app from running until all jobs are completed, but I want to know if there is something like Thread.Join() or if there's any way to retrieve each thread that is being assigned a job.

推荐答案

您可以使用事件进行同步.像这样:

You could use events to sync. Like this:

private static ManualResetEvent resetEvent = new ManualResetEvent(false);

public static void Main()
{
    ThreadPool.QueueUserWorkItem(arg => DoWork());
    resetEvent.WaitOne();
}

public static void DoWork()
{
    Thread.Sleep(5000);
    resetEvent.Set();
}

如果您不想将事件集嵌入到您的方法中，您可以执行以下操作:

If you don't want to embed event set into your method, you could do something like this:

var resetEvent = new ManualResetEvent(false);
ThreadPool.QueueUserWorkItem(
    arg => 
    {
        DoWork();
        resetEvent.Set();
    });
resetEvent.WaitOne();

对于多个项目:

var events = new List<ManualResetEvent>();

foreach(var job in jobs)
{   
    var resetEvent = new ManualResetEvent(false);
    ThreadPool.QueueUserWorkItem(
        arg =>
        {
            DoWork(job);
            resetEvent.Set();
        });
    events.Add(resetEvent);
}
WaitHandle.WaitAll(events.ToArray());

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