C# 多线程的等待所有线程结束的一个问题

using System;
using System.Threading;

namespace ConsoleApplication1
{
    class Program
    {
        private static AutoResetEvent[] events;

        static void Main( string [] args)
        {
            int threadNum = 10;
            Thread[] thread = new Thread[threadNum];

            events = new AutoResetEvent[threadNum];

            for ( int i = 0; i < threadNum; i++)
            {
                var waithandler = new AutoResetEvent( false );
                events[i] = waithandler;
                ThreadStart starter = delegate
                {
                    var param = new Tuple< string , AutoResetEvent>( "test print:" + i, waithandler);
                    Print(param);
                };
                thread[i] = new Thread(starter)
                {
                    Name = "thread" + i.ToString()
                };
            }

            for ( int i = 0; i < threadNum; i++)
            {
                thread[i].Start();
            }

            WaitHandle.WaitAll(events);
            Console.WriteLine( "Completed!" );
            Console.Read();

        }

        private static void Print( object param)
        {
            var p = (Tuple< string , AutoResetEvent>)param;
            Console.WriteLine(Thread.CurrentThread.Name + ": Begin!" );
            Console.WriteLine(Thread.CurrentThread.Name + ": Print" + p.Item1);
            Thread.Sleep(300);
            Console.WriteLine(Thread.CurrentThread.Name + ": End!" );
            p.Item2.Set();
        }
    }
}

一次性地Set，其实使用ManualResetEvent就足够了。

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

namespace ConsoleApplication1
{
    class Program
    {
        static void Main( string [] args)
        {
            var waits = new List<EventWaitHandle>();
            for ( int i = 0; i < 10; i++)
            {
                var handler = new ManualResetEvent( false );
                waits.Add(handler);
                new Thread( new ParameterizedThreadStart(Print))
                {
                    Name = "thread" + i.ToString()
                }.Start( new Tuple< string , EventWaitHandle>( "test print:" + i, handler));
            }
            WaitHandle.WaitAll(waits.ToArray());
            Console.WriteLine( "Completed!" );
            Console.Read();

        }

        private static void Print( object param)
        {
            var p = (Tuple< string , EventWaitHandle>)param;
            Console.WriteLine(Thread.CurrentThread.Name + ": Begin!" );
            Console.WriteLine(Thread.CurrentThread.Name + ": Print" + p.Item1);
            Thread.Sleep(300);
            Console.WriteLine(Thread.CurrentThread.Name + ": End!" );
            p.Item2.Set();
        }

    }
}

来自为知笔记(Wiz)