委托/事件:猫叫鼠跑人醒

猫叫鼠跑人醒,这是一个很经典的   委托/事件  案例,本例中,猫类、鼠类、人类的基本属性不再累述,关键说一下  委托/事件。

第一步:因此在定义完毕  委托/事件  之后,要让猫叫触发定义的事件,

第二步:要给鼠对象、人对象订阅猫叫事件,以在猫叫触发事件时作出相应的反应。

 

using System;

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

namespace CatCryRatRunMasterWake
{
  /// <summary>
  /// define a delegate
  /// </summary>
  public delegate void CatCryEventHandle();

  class Program
  {
    static void Main(string[] args)
    {
      Cat cat = new Cat("Tom");
      Rat rat = new Rat("Jack", cat);
      Master master = new Master("Ls", cat);
      cat.Cry();

      Console.ReadKey();
    }
  }

  /// <summary>
  /// define a cat objects
  /// </summary>
  public class Cat
  {
    private string _name;

    //define a cat cry event
    public event CatCryEventHandle WhenCatCry;

    public Cat(string name)
    {
    _name = name;
      }

    public void Cry()
    {
      this.WhenCatCry();
      Console.WriteLine("猫叫!");
    }
  }

  /// <summary>
  /// define a rat objects
  /// </summary>
  public class Rat
  {
    private string _name;
    public Rat(string name, Cat cat)
    {
      _name = name;
      cat.WhenCatCry += Run; //订阅猫叫事件
    }

    public void Run()
    {
      Console.WriteLine("老鼠跑!");
    }
  }

  /// <summary>
  /// define a master objects
  /// </summary>
  public class Master
  {
    private string _name;
    public Master(string name, Cat cat)
    {
      _name = name;
      cat.WhenCatCry += WakeUp; //订阅猫叫事件
    }

    public void WakeUp()
    {
      Console.WriteLine("主人醒!");
    }
  }
}

posted @ 2017-02-16 10:49  hanhan6494  阅读(260)  评论(0编辑  收藏  举报