多线程按顺序调用，A->B->C，AA 打印 5 次，BB 打印10 次，CC 打印 15 次，重复 10 次

using System;
using System.Threading;

class PrintThread
{
    private string name;
    private int count;
    private int repeat;
    private AutoResetEvent waitEvent;
    private AutoResetEvent nextEvent;

    public PrintThread(string name, int count, int repeat, AutoResetEvent waitEvent, AutoResetEvent nextEvent)
    {
        this.name = name;
        this.count = count;
        this.repeat = repeat;
        this.waitEvent = waitEvent;
        this.nextEvent = nextEvent;
    }

    public void Run()
    {
        for (int i = 0; i < repeat; i++)
        {
            waitEvent.WaitOne();  // 等待前一个线程的信号

            for (int j = 0; j < count; j++)
            {
                Console.WriteLine("{0}: {1}", name, j + 1);
                Thread.Sleep(100);
            }

            nextEvent.Set();  // 通知下一个线程继续执行
        }
    }
}

class Program
{
    static void Main(string[] args)
    {
        AutoResetEvent eventA = new AutoResetEvent(false);
        AutoResetEvent eventB = new AutoResetEvent(false);
        AutoResetEvent eventC = new AutoResetEvent(false);

        PrintThread threadA = new PrintThread("AA", 5, 10, eventC, eventA);
        PrintThread threadB = new PrintThread("BB", 10, 10, eventA, eventB);
        PrintThread threadC = new PrintThread("CC", 15, 10, eventB, eventC);

        Thread tA = new Thread(threadA.Run);
        Thread tB = new Thread(threadB.Run);
        Thread tC = new Thread(threadC.Run);

        tA.Start();
        tB.Start();
        tC.Start();

        // 启动第一轮打印任务
        eventC.Set();

        // 等待所有线程完成打印任务
        tA.Join();
        tB.Join();
        tC.Join();

        Console.WriteLine("All threads have finished printing.");
    }
}