无法正确停止C#中的所有线程

时间:2018-07-25 12:08:16

标签: c# multithreading token threadpool

我正在尝试使用C#停止所有带有token或thread.abort的线程,但是两者均无法正常工作

                int workerThreads = 1;
                int portThreads = 0;

                ThreadPool.SetMinThreads(workerThreads, portThreads);
                ThreadPool.SetMaxThreads(workerThreads,portThreads);
                foreach (string d in list)
                {
                    var p = d;
                    ThreadPool.QueueUserWorkItem((c) =>
                    {
                        this.checker(p,cts.Token);
                    });
                }`

用checker调用的函数的构建如下:

    private void checker(string f, object obj)
    {
        try
        {
            CancellationToken token = (CancellationToken)obj;

            if (token.IsCancellationRequested)
            {
                MessageBox.Show("Stopped", "Checker aborted");
                token.ThrowIfCancellationRequested();
                cts = new CancellationTokenSource();
            } //etc main features of fucntion are hidden from here

我想在调用cts.Cancel()时正确停止所有线程。但是每次都出现:Stopped,检查程序异常终止,不仅一次,而且可能在每个线程进程中都显示。如何显示消息一次并同时停止所有线程? 我还要设置一些最大线程数,然后再继续其他线程。我尝试了SetMaxThreads,但是这似乎都不起作用。

1 个答案:

答案 0 :(得分:1)

请参考注释以获取最佳实践建议,因为您在此处所做的操作并不完全正确,但是要实现您的目标,您可以使用带有锁的标志,如下所示:

private static object _lock = new object();
private static bool _stoppedNotificationShown = false;
private void checker(string f, object obj)
{
    try
    {
        CancellationToken token = (CancellationToken)obj;

        if (token.IsCancellationRequested)
        {
            lock(_lock) {
                if (!_stoppedNotificationShown) {
                    _stoppedNotificationShown = true;
                    MessageBox.Show("Stopped", "Checker aborted");
                }
            }
            token.ThrowIfCancellationRequested();
            cts = new CancellationTokenSource();
        } //etc main features of fucntion are hidden from here