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每天一段代碼-裝飾者模式(Decorator pattern)

2019-11-17 02:22:04
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每天一段代碼-裝飾者模式(Decorator pattern)

知識點

  類應該對擴展開放,對修改封閉。

案例

  (本故事純屬虛構)

  某日早上,流年剛把新開發的游戲項目提交給經理

1     public abstract class Role2     {3         public virtual string RoleName { get; PRivate set; }4         public abstract int PhysicalAttack();5     }
 1     class Samurai : Role 2     { 3         public override string RoleName 4         { 5             get 6             { 7                 return "武士"; 8             } 9         }10         public override int PhysicalAttack()11         {12             return 999;13         }14     }

  (當然這還算不上個游戲),項目經理看了沒幾分鐘,“這什么屌逼玩意?游戲角色都不帶裝備的!!! 玩家還玩個屁啊”;

  “那好吧,給角色加把武器?”我弱弱的回了句。

  “你個2屌,加個武器就夠了?至少弄上個法寶、寶寶、套裝....”。經理逼逼了一大堆。

  "我靠,那怎么改?"我在心里默念了一句。

  “回去好好改去,******”經理又逼逼了一大堆。

  流年一溜煙,跑出了經理辦公室,“還好溜的快,要不然口水都夠洗臉了”。

  趕緊回去把代碼改了下,*****,樓主指尖在鍵盤上框框飛舞。

  突然想到,我靠,要是哪天經理又要加點什么東西,豈不是很麻煩。

  趕緊Google找了本小黃書看了下,看看有什么好方法。哈哈哈...,有了,就是它了——《裝飾者模式》。

  于是。。。

 1     //把裝飾者抽象一下,這樣再加什么東西直接繼承他就行 2     public abstract class PropDocorator : Role 3     { 4         Role _role; 5         public PropDocorator(Role role) 6         { 7             _role = role; 8         } 9         public override string RoleName10         {11             get { return this._role.RoleName; }12         }13         public abstract string Docorate();14         //新加了元素攻擊15         public abstract int ElementAttack();16     }

  通過組合的方式,擴展了角色原有的功能,而且不需要去動原來的代碼。

  給你加把刀試試火力

 1     class Knife:PropDocorator 2     { 3         Role _role; 4         private string _name = "貪狼刀"; 5  6         public Knife(Role role):base(role) { 7             _role = role; 8         } 9 10         public override string Docorate()11         {12             return this._role.RoleName + "裝配" + this._name;13         }14 15         public override int PhysicalAttack()16         {17             return this._role.PhysicalAttack() + 1000;18         }19 20         public override int ElementAttack()21         {22             return 1200;23         }24     }

  好了,該加的都加上了,趕緊Debug下,試試

  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