今天在博客園上看到一道面試題，是關于委托和事件的，為了重溫事件的應用，自己又做了一遍。
題目：
?程序設計: 貓大叫一聲，所有的老鼠都開始逃跑，主人被驚醒。(C#語言)

要求：? 1.要有聯動性，老鼠和主人的行為是被動的。
????????? 2.考慮可擴展性，貓的叫聲可能引起其他聯動效應。

Code
using?System;
using?System.Collections.Generic;
using?System.Linq;
using?System.Text;
using?System.IO;

namespace?ConsoleApplication3
{
????
????class?Program
????{
???????
????????static?void?Main(string[]?args)
????????{
????????????Cat?cat?=?new?Cat("阿甲");
????????????Mouse?mouse?=?new?Mouse("阿乙");
????????????Person?person?=?new?Person("阿丙");
????????????Chicken?chicken?=?new?Chicken("阿丁");
????????????cat.Cry();
????????????Console.ReadKey();
????????}


???????
????}

????public?class?ActionEventArgs?:?EventArgs
????{
????????private?string?name;
????????public?string?Name
????????{
????????????get?{?return?name;?}
????????????set?{?name?=?value;?}
????????}
????}

????class?Cat
????{
????????public?delegate?void?DeleAction(object?sender,ActionEventArgs?e);
????????public?static?event?DeleAction?ActionHandle;
????????private?string?name;
????????public?string?Name
????????{
????????????set?{?name?=?value;?}
????????????get?{?return?name;?}
????????}
????????public?Cat(string?name)
????????{
????????????this.name?=?name;
????????}
????????public?void?Cry()
????????{
???????????
????????
????????????Console.WriteLine(Name+"貓大叫一聲!");
????????????ActionEventArgs?ae?=?new?ActionEventArgs();
????????????ae.Name?=?name;
????????????OnAction(this,ae);
???????????
??????????
???????????
????????}

????????public??void?OnAction(object?sender,ActionEventArgs?e)
????????{
????????????if?(ActionHandle?!=?null)
????????????{
????????????????ActionHandle(sender,?e);
????????????}
????????}
????}

????class?Mouse
????{
????????private?string?name;
????????public?string?Name
????????{
????????????set?{?name?=?value;?}
????????????get?{?return?name;?}
????????}
????????public?Mouse(string?name)
????????{
????????????Cat.ActionHandle?+=?new?Cat.DeleAction(Action);
????????????this.name?=?name;
????????}
????????public?void?Action(object?sender,ActionEventArgs?e)
????????{
????????????Console.WriteLine(e.Name+"的叫聲讓老鼠"+this.Name+"四處逃竄!");
????????????
????????}
????}

????class?Person
????{
????????private?string?name;
????????public?string?Name
????????{
????????????set?{?name?=?value;?}
????????????get?{?return?name;?}
????????}
????????public?Person(string?name)
????????{
????????????Cat.ActionHandle?+=?new?Cat.DeleAction(Action);
????????????this.name?=?name;
????????}

????????public?void?Action(object?sender,?ActionEventArgs?e)
????????{

????????????Console.WriteLine(e.Name?+?"的叫聲讓主人"?+?this.Name?+?"驚醒了!");
????????}
????}

????class?Chicken
????{
????????private?string?name;
????????public?string?Name
????????{
????????????set?{?name?=?value;?}
????????????get?{?return?name;?}
????????}
????????public?Chicken(string?name)
????????{
????????????Cat.ActionHandle?+=?new?Cat.DeleAction(Action);
????????????this.name?=?name;
????????}

????????public?void?Action(object?sender,?ActionEventArgs?e)
????????{

????????????Console.WriteLine(e.Name?+?"的叫聲讓雞"?+?this.Name?+?"也打鳴了!");
????????}
????}
}

?

轉載于:https://www.cnblogs.com/zoupeiyang/archive/2009/09/01/1558063.html

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