c# – 使用Thread.Sleep(0)和Join()

public static class Program
    {
        public static void ThreadMethod()
        {
            for (int i = 0; i < 10; i++)
            {
                Console.WriteLine(“ThreadProc: {0}”,i);
                Thread.Sleep(0);
            }
        }
        public static void Main()
        {
            Thread t = new Thread(new ThreadStart(ThreadMethod));
            t.Start();
            for (int i = 0; i < 4; i++)
            {
                Console.WriteLine(“Main thread: Do some work.”);
                Thread.Sleep(0);
            }
            t.Join();
        }
    }

我有太多问题：

1)Thread.Sleep(0)的用途是什么,我的意思是,我尝试了两种情况：有或没有Thread.Sleep(0),运行时没有太大区别

2)t.Join()在这里真的很有用,因为它在Main方法的最后？