Thread.Join()用法的理解

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  

 1using System;
 2
 3namespace TestThreadJoin
 4{
 5    class Program
 6    {
 7        static void Main()
 8        {
 9            System.Threading.Thread x = new System.Threading.Thread(new System.Threading.ThreadStart(f1));
10            x.Start();
11            Console.WriteLine("This is Main.{0}", 1);
12            x.Join();
13            Console.WriteLine("This is Main.{0}", 2);
14            Console.ReadLine();
15        }
16        static void f1()
17        {
18            System.Threading.Thread y = new System.Threading.Thread(new System.Threading.ThreadStart(f2));
19            y.Start();
20            y.Join();
21            Console.WriteLine("This is F1.{0}",1);
22        }
23
24        static void f2()
25        {
26            Console.WriteLine("This is F2.{0}", 1);
27        }
28    }
29}

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