程序代码：

using System;
using System.Collections.Generic;
using System.Text;

namespace TestLibrary
{
    public class Car
    {
        private string name;

        public string Name
        {
            get { return name; }
            set
            {
                if (value == null)
                {
                    name = "桑塔纳";
                }
                else
                {
                    name = value;
                }
            }
        }

        public void MoveCar(object sender , DriverEventArgs e)
        {
            Driver d = (Driver)sender;
            if (e.IsMove)
            {
                Console.WriteLine("{0}开动了{1}！",d.Name,name);
            }
            else
            {
                Console.WriteLine("{0}关掉了{1}引擎！", d.Name, name);
            }
        }

        public Car()
        {
            this.Name = null;
        }

        public Car(string name)
        {
            this.Name = name;
        }
    }
}



using System;
using System.Collections.Generic;
using System.Text;

namespace TestLibrary
{
    public delegate void DriverCarHandler(object sender,DriverEventArgs e);

    public class DriverEventArgs : EventArgs
    {
        private bool isMove;//是否开动汽车

        public bool IsMove
        {
            get { return isMove; }
            set { isMove = value; }
        }

        public DriverEventArgs(bool isMove)
        {
            this.IsMove = isMove;
        }
    }

    public class Driver
    {
        public event DriverCarHandler DriverCarEventHandler;

        private string name;

        public string Name
        {
            get { return name; }
            set { name = value; }
        }

        public void DriverCar(Object sender , LightEventArgs e)
        {
            Light l = (Light)sender;
            Console.WriteLine("{0}看到交通灯信息：{1}。", name, e.Message);
            if (l.IsLight)
            {               
                Console.WriteLine("{0}兴奋的大喊道：哈，是绿灯，太走运了！", name);
            }
            else
            {
                Console.WriteLine("{0}沮丧的叹气：哎，又吃红灯了，今天真倒霉！", name);
            }
            if (DriverCarEventHandler != null)
            {
                DriverCarEventHandler(this, new DriverEventArgs(l.IsLight));
            }
        }

        private Driver() { }

        public Driver(string name)
        {
            this.Name = name;
        }
    }
}



using System;
using System.Collections.Generic;
using System.Text;

namespace TestLibrary
{
    public delegate void ChangeIsLightHandler(object sender, LightEventArgs e);

    public class LightEventArgs : EventArgs
    {
        private string message;

        public string Message
        {
            get { return message; }
            set { message = value; }
        }

        public LightEventArgs(string message)
        {
            this.Message = message;
        }
    }
    public class Light
    {
        public event ChangeIsLightHandler ChangeIsLightEventHandler;
        private bool isLight;//True = 绿,False = 红

        public bool IsLight
        {
            get { return isLight; }
            set { isLight = value; }
        }

        public void ChangeIsLight(object sender, EventArgs e)//灯状态切换的方法
        {
            string message;
            if (isLight)
            {
                IsLight = false;
                message = "现在是红灯，请停车！";
            }
            else
            {
                IsLight = true;
                message = "现在是绿灯，请有序通过！";
            }
            if (ChangeIsLightEventHandler != null)
            {
                ChangeIsLightEventHandler(this, new LightEventArgs(message));
            }
            Console.WriteLine();
        }

        public Light() { }

        public Light(bool isLight)
        {
            this.IsLight = isLight;
        }
    }
}


using System;
using System.Collections.Generic;
using System.Text;
using TestLibrary;
using System.Timers;

namespace TestConsole
{
    class Program
    {
        static void Main(string[] args)
        {
            Timer timer = new Timer(5000);
            Light l1 = new Light();
            Light l2 = new Light(true);
            Driver d1 = new Driver("林志玲");
            Car c1 = new Car("法拉利");
            Driver d2 = new Driver("程序员");
            Car c2 = new Car();
            l1.ChangeIsLightEventHandler += d1.DriverCar;
            l2.ChangeIsLightEventHandler += d2.DriverCar;
            d1.DriverCarEventHandler += c1.MoveCar;
            d2.DriverCarEventHandler += c2.MoveCar;
            timer.Elapsed += new ElapsedEventHandler(l1.ChangeIsLight);
            timer.Elapsed += new ElapsedEventHandler(l2.ChangeIsLight);
            timer.Start();
            Console.ReadKey();
        }
    }
}