Using The Event Keyword : delegate event « delegate « C# / CSharp Tutorial

1. C# / CSharp Tutorial
2. delegate
3. delegate event

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

    public class MyEventArgs : EventArgs
    {
        public readonly int Hour;
        public readonly int Minute;
        public readonly int Second;
        public MyEventArgs(int hour, int minute, int second)
        {
            this.Hour = hour;
            this.Minute = minute;
            this.Second = second;
        }
    }
    public delegate void MyHandler(object clock,MyEventArgs timeInformation);

    public class Clock
    {
        private int hour;
        private int minute;
        private int second;
        public event MyHandler SecondChanged;
        protected virtual void OnSecondChanged(MyEventArgs e)
        {
            if (SecondChanged != null)
            {
                SecondChanged(this, e);
            }
        }
        public void Run()
        {
            for (; ; )
            {
                System.DateTime dt = System.DateTime.Now;
                if (dt.Second != second){
                    MyEventArgs timeInformation =new MyEventArgs(dt.Hour, dt.Minute, dt.Second);
                    OnSecondChanged(timeInformation);
                }
                this.second = dt.Second;
                this.minute = dt.Minute;
                this.hour = dt.Hour;
            }
        }
    }
    public class ConsoleHandler
    {
        public void Register(Clock theClock)
        {
            theClock.SecondChanged += new MyHandler(TimeHasChanged);
        }
        public void TimeHasChanged(object theClock, MyEventArgs ti)
        {
            Console.WriteLine("Current Time: {0}:{1}:{2}",ti.Hour.ToString(),ti.Minute.ToString(),ti.Second.ToString());
        }
    }
    public class Test
    {
        public static void Main()
        {
            Clock theClock = new Clock();
            ConsoleHandler dc = new ConsoleHandler();
            dc.Register(theClock);
            theClock.Run();
        }
    }