C#：自定义事件

1.声明关于事件的委托;

2.声明事件;

3.编写触发事件的函数;

4.创建事 件处理程序;

5.注册事件处理程序;

6.在适当的条件下触发事件.

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

namespace DefineEvent
{
    class Program
    {
        static void Main(string[] args)
        {
            DefineEvent defineEvent = new DefineEvent();
            DealEvent dealEvent = new DealEvent(defineEvent);
            defineEvent.OnAlarm();
            Console.ReadKey();
        }
    }

    class DefineEvent
    { 
        //1.申明委托
        public delegate void myEventHandle(object sender, EventArgs e);

        //2.将创建委托与特定的事件(Alarm)相关联，
        public event myEventHandle myEvent;

        //3.引发事件
        public void OnAlarm()
        {
            if (this.myEvent != null)
            {
                Console.WriteLine("Trigger Event!");
                this.myEvent(this, new EventArgs()); //引发事件
            }
        }
    }

    class DealEvent
    { 
        //4.处理方法
        void DealWithEventHandle(object sender, EventArgs e)
        {
            Console.WriteLine("Deal with the triggered event");
        }

        //5.订阅事件 
        public DealEvent(DefineEvent de)
        {
            de.myEvent += new DefineEvent.myEventHandle(DealWithEventHandle);
        }
    }
}