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C# - 线程Join联接

它会导致所有调用线程等待，直到当前线程(联接的线程)终止或完成其任务。

using System;  
using System.Threading;  
public class MyThread  
{  
    public void Thread1()  
    {  
        for (int i = 0; i < 5; i++)  
        {  
            Console.WriteLine(i);  
            Thread.Sleep(200);  
        }  
    }  
}  
public class ThreadExample  
{  
    public static void Main()  
    {  
        MyThread mt = new MyThread();  
        Thread t1 = new Thread(new ThreadStart(mt.Thread1));  
        Thread t2 = new Thread(new ThreadStart(mt.Thread1));  
        Thread t3 = new Thread(new ThreadStart(mt.Thread1));  
        t1.Start();  
        t1.Join();  
        t2.Start();  
        t3.Start();  
    }  
}