c# - .NET 2.0 中的等效任务

Question

<分区>

Answer 1

我的解决方案是使用 BackgroundWorker 并将其包装在辅助类中。
这样您还可以指定其他完成事件。

public delegate void Action();

public class TaskRunner
{
    private readonly object _lock = new object();
    private bool _complete;
    private int _counter;

    public void AddTask(Action action)
    {
        var worker = new BackgroundWorker();
        worker.DoWork += (sender, args) => action();
        worker.RunWorkerCompleted += (sender, args) =>
        {
            try
            {
                Monitor.Enter(_lock);
                if (--_counter == 0)
                {
                    Monitor.Pulse(_lock);
                }
            }
            finally
            {
                Monitor.Exit(_lock);
            }
        };

        try
        {
            Monitor.Enter(_lock);
            if (_complete)
            {
                throw new Exception("task runner is complete");
            }

            _counter++;
            worker.RunWorkerAsync();
        }
        finally
        {
            Monitor.Exit(_lock);
        }
    }

    public void Wait()
    {
        while (!_complete)
        {
            try
            {
                Monitor.Enter(_lock);

                if (_counter == 0)
                {
                    _complete = true;
                    return;
                }

                Monitor.Wait(_lock);
            }
            finally
            {
                Monitor.Exit(_lock);
            }
        }
    }
}

static void Main(string[] args)
{
    var task = new TaskRunner();

    for (var i = 0; i < 10; i++)
    {
        task.AddTask(() => 
        { 
            //Do something
        });
    }

    task.Wait();

    Console.WriteLine("Done");
    Console.ReadLine();
}

希望对您有所帮助。