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每天一段代码-装饰者模式(Decorator pattern)

2019-11-17 02:22:04
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每天一段代码-装饰者模式(Decorator pattern)

知识点

  类应该对扩展开放,对修改封闭。

案例

  (本故事纯属虚构)

  某日早上,流年刚把新开发的游戏项目提交给经理

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     }

  (当然这还算不上个游戏),项目经理看了没几分钟,“这什么屌逼玩意?游戏角色都不带装备的!!! 玩家还玩个屁啊”;

  “那好吧,给角色加把武器?”我弱弱的回了句。

  “你个2屌,加个武器就够了?至少弄上个法宝、宝宝、套装....”。经理逼逼了一大堆。

  "我靠,那怎么改?"我在心里默念了一句。

  “回去好好改去,******”经理又逼逼了一大堆。

  流年一溜烟,跑出了经理办公室,“还好溜的快,要不然口水都够洗脸了”。

  赶紧回去把代码改了下,*****,楼主指尖在键盘上框框飞舞。

  突然想到,我靠,要是哪天经理又要加点什么东西,岂不是很麻烦。

  赶紧Google找了本小黄书看了下,看看有什么好方法。哈哈哈...,有了,就是它了——《装饰者模式》。

  于是。。。

 1     //把装饰者抽象一下,这样再加什么东西直接继承他就行 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         //新加了元素攻击15         public abstract int ElementAttack();16     }

  通过组合的方式,扩展了角色原有的功能,而且不需要去动原来的代码。

  给你加把刀试试火力

 1     class Knife:PropDocorator 2     { 3         Role _role; 4         private string _name = "贪狼刀"; 5  6         public Knife(Role role):base(role) { 7             _role = role; 8         } 9 10         public override string Docorate()11         {12             return this._role.RoleName + "装配" + 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,该加的都加上了,赶紧Debug下,试试

  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6KjwalINxlO08h8878vKVxZPdVY1q+tgZUWlwFwWQJnjXHSHHAc9VtAbQPXhYmn8oShAZU8KanT2BUF504ISUocPq1Tp37FwZDhAWVHBnfIT29gehGNedMe5f3AY0MPA1EFq+Zyag113UNkThOpJUCVHzdsT1b5h8VUHygo4IDjiemz7B4eGqAEsFG4/REBlAQAAAKBUgMoCAAAAQKkAlQUAAACAUgEqCwAAAACl4qSoLOSX1YiH9l9Y8lEAOMrQbwTlt8MAQLG8fJWF/LKS9eh394FVVnoELzT5KAAcVRRuhJP+4AtweBy9NyyWeHeQX5blhSYfBYCjiuKNcJJf4gAcJpBfFvLLAgBAgf46cnBxgSI5cpnvIL+s6mwBh51fVpapZqcNFsLCV3phfhTeGg8qCxTFkVNZyC/7MvPL

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