C#基础可以快速理解事件机制的事件示例

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

namespace EvenDemo
{
    /// <summary>
    /// 事件参数类，继承自EventArgs，包含事件信息
    /// </summary>
    public class DoorInfoEventArgs : EventArgs
    {
        /// <summary>
        /// 显示门状态信息
        /// </summary>
        public string doorInfo;

        /// <summary>
        /// 构造函数
        /// </summary>
        /// <param name="isOpen">是否打开门，true/false</param>
        public DoorInfoEventArgs(bool isOpen)
        {
            if (isOpen)
            {
                doorInfo = "门现在已经打开了!";
            }
            else
            {
                doorInfo = "门不能打开！";
            }
        }
    }

    /// <summary>
    /// 定义门代理
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e">事件信息</param>
    public delegate void OpenDoorEventHandler(object sender, DoorInfoEventArgs e);


    /// <summary>
    /// 事件类
    /// </summary>
    public class CommandDoor
    {
        /// <summary>
        /// 定义事件(即：创建代理对象)
        /// </summary>
        public event OpenDoorEventHandler openDoor;

        /// <summary>
        /// 定义触发事件的属性
        /// </summary>
        public bool IsOpen
        {
            set 
            {
                DoorInfoEventArgs myEven = new DoorInfoEventArgs(value);//事件参数
                openDoor(this, myEven);//调用事件代理
            }
        }
 
    }

    class Program
    {
        static void Main(string[] args)
        {
            //创建事件对象，并添加事件实现代理的实例化
            CommandDoor commandDoor = new CommandDoor();
            commandDoor.openDoor += new OpenDoorEventHandler(Door);

            //由设置属性的值触发事件
            Console.WriteLine("是否打开门？Y/N");
            char commandChar =(char) Console.Read();
            if (commandChar == 'Y')
            {
                commandDoor.IsOpen = true;
            }
            else
            {
                commandDoor.IsOpen = false;
            }
            Console.ReadKey();

        }

        /// <summary>
        /// 事件执行的方法
        /// </summary>
        /// <param name="source"></param>
        /// <param name="e"></param>
        public static void Door(object source, DoorInfoEventArgs e)
        {
            Console.WriteLine(e.doorInfo);
        }
    }
}