【C#设计模式(10)——装饰器模式(Decorator Pattern)】

前言

装饰器模式可以在运行时为对象添加额外的功，而无需修改原始对象的代码。这种方式比继承更加灵活。

代码

//蛋糕类（抽象类）
public abstract class Cake
{public  abstract void Create();
}
//奶油蛋糕类
public class CreamCake : Cake
{public override void Create(){Console.WriteLine("制作奶油蛋糕...");}
}
//蛋糕装饰器类（抽象类）
public abstract class CakeDecorator : Cake
{protected Cake cake;protected CakeDecorator(Cake cake){this.cake = cake;}public override void Create(){cake.Create();}
}
//草莓装饰器类
public class StrawberryDecorator : CakeDecorator
{public StrawberryDecorator(Cake cake) : base(cake){}public override void Create(){base.Create();AddDecorator();}public void AddDecorator(){Console.WriteLine("给蛋糕添加草莓..");}
}
//芒果装饰器类
public class MangoDecorator : CakeDecorator
{public MangoDecorator(Cake cake) : base(cake){}public override void Create(){base.Create();AddDecorator();}public void AddDecorator(){Console.WriteLine("给蛋糕添加芒果..");}
}/** 结构模型：Structural Pattern* 装饰器模式：Decorator Pattern*/internal class Program{static void Main(string[] args){//制作奶油蛋糕Cake creamCake = new CreamCake();//给奶油蛋糕 + 草莓=>草莓奶油蛋糕CakeDecorator strawberryDecorator = new StrawberryDecorator(creamCake);//给草莓奶油蛋糕 + 芒果 => 草莓奶油 芒果 蛋糕 CakeDecorator mangoDecorator = new MangoDecorator(strawberryDecorator);//制作完成mangoDecorator.Create();Console.ReadLine();}}

运行结果