线程join 方法

指在一线程里面调用另一线程join方法时，表示将本线程阻塞直至另一线程终止时再执行  
  比如  

 using System;

 namespace TestThreadJoin
 {
     class Program
     {
         static void Main()
         {
             System.Threading.Thread x = new System.Threading.Thread(new System.Threading.ThreadStart(f1));
            x.Start();
            Console.WriteLine("This is Main.{0}", 1);
            x.Join();
            Console.WriteLine("This is Main.{0}", 2);
            Console.ReadLine();
        }
        static void f1()
        {
            System.Threading.Thread y = new System.Threading.Thread(new System.Threading.ThreadStart(f2));
            y.Start();
            y.Join();
            Console.WriteLine("This is F1.{0}",1);
        }

        static void f2()
        {
            Console.WriteLine("This is F2.{0}", 1);
        }
    }
}

 using System;

 namespace TestThreadJoin
 {
     class Program
     {
         static void Main()
         {
             System.Threading.Thread x = new System.Threading.Thread(new System.Threading.ThreadStart(f1));
            x.Start();
            Console.WriteLine("This is Main.{0}", 1);
            x.Join();
            Console.WriteLine("This is Main.{0}", 2);
            Console.ReadLine();
        }
        static void f1()
        {
            System.Threading.Thread y = new System.Threading.Thread(new System.Threading.ThreadStart(f2));
            y.Start();
            y.Join();
            Console.WriteLine("This is F1.{0}",1);
        }

        static void f2()
        {
            Console.WriteLine("This is F2.{0}", 1);
        }
    }
}

这儿有三个线程在处理(包括主线程),大家可看看执行结果.
结果:
This is Main.1
This is F2.1
This is F1.1
This is Main.2

如果: 注释//  x.Join();
结果:
This is Main.1
This is Main.2
This is F2.1
This is F1.1