C#线程池例子

using System;
using System.Collections.Generic;
using System.Text;
using System.Threading;



class count
{
    public count(int from, ManualResetEvent e)
    {
        _from = from;
        _done_event = e;
    }
    private int _from;
    private int _sum;
    private ManualResetEvent _done_event;
    public int docount(int _from)
    {
        int sum = 0;
        for (int i = 0; i <= _from; i++)
        {
            sum += i;
        }
        return sum;
    }
    public void ThreadPoolCallback(Object threadContext)
    {
        int threadIndex = (int)threadContext;
        Console.WriteLine("Thread {0} started", threadIndex);
        _sum = docount(_from);
        Console.WriteLine("Thread count result is {0}", _sum);
        _done_event.Set();
    }

}

public class ThreadPoolEx
{
    static void Main()
    {
        const int times = 10;
        ManualResetEvent[] mre = new ManualResetEvent[times];
        Random r = new Random();
        Console.WriteLine("Launch {0} tasks", times);
        for (int i = 0; i < times; i++)
        {
            mre[i] = new ManualResetEvent(false);
            count c = new count(r.Next(1, 1000), mre[i]);
            ThreadPool.QueueUserWorkItem(c.ThreadPoolCallback, i);

        }
        WaitHandle.WaitAll(mre);
        Console.WriteLine("All threads finished.");

    }


}