c# 指定线程数的多线程操作

public class TaskInfo
{
    public bool IsBusy { get; set; }

    public int ID { get; set; }
}

public class Test
{        
     public void Work(object obj)
    {
        var taskInfo = obj as TaskInfo;

　　　　　//Do something ...
        Thread.Sleep(5000);

        taskInfo.IsBusy = false;
    }
        
    public void Test_MultyThread()
    {
        int threadCount = 2;

        Queue<TaskInfo> taskQueue = new Queue<TaskInfo>();
        taskQueue.Enqueue(new TaskInfo() { ID = 1 });
        taskQueue.Enqueue(new TaskInfo() { ID = 2 });
        taskQueue.Enqueue(new TaskInfo() { ID = 3 });
        taskQueue.Enqueue(new TaskInfo() { ID = 4 });
        taskQueue.Enqueue(new TaskInfo() { ID = 5 });

        List<TaskInfo> workingList = new List<TaskInfo>();
        while (taskQueue.Count > 0)
        {
            if (workingList.Count < threadCount)
            {
                var taskInfo = taskQueue.Dequeue();
                taskInfo.IsBusy = true;
                workingList.Add(taskInfo);

                Console.WriteLine("Processing ID: {0}", taskInfo.ID);
                ThreadPool.QueueUserWorkItem(new WaitCallback(Work), taskInfo);
            }
            else
            {
                if (workingList.Any(x => !x.IsBusy))
                {
                    workingList.RemoveAll(x => !x.IsBusy);
                }
                else
                {
                    Console.ForegroundColor = ConsoleColor.Yellow;
                    Console.WriteLine("==>     Waiting for free thread ...");
                    Console.ResetColor();

                    Thread.Sleep(1000);
                }
            }
        }
    }
}