装饰（Decorator）模式又名包装（Wrapper）模式[GOF95]。装饰模式以对客户端透明的方式扩展对象的功能，是继承关系的一个替代方案。
2：类图
3：代码
//抽象构件（Component）角色 public abstract class Tank
{
public abstract void Shot();
} //具体构件（Concrete Component）角色 public class T50 : Tank { public override void Shot()
{
} } //装饰（Decorator）角色 public abstract class Decorator : Tank //Do Like { private Tank tank; //Has-a public void SetComponent(Tank tanks) { this.tank = tanks; } public override void Shot() { this.tank.Shot(); } } //具体装饰（Concrete Decorator）角色 public class ConcreteDecoratorA : Decorator { public override void Shot() { System.Console.WriteLine("增加夜视能力"); base.Shot(); } } //具体装饰（Concrete Decorator）角色 public class ConcreteDecoratorB : Decorator { public override void Shot() { System.Console.WriteLine("增加卫星定位能力"); base.Shot(); } } /* public abstract class Tank { public abstract void Shot(); } public class T50 : Tank { public override void Shot() { } } public abstract class Decorator : Tank { private Tank tank; public Decorator(Tank _tank) { this.tank = _tank; } public override void Shot() { } } public class DecoratorA : Decorator { public DecoratorA(Tank tank) : base(tank) { } public override void Shot() { System.Console.WriteLine("增加夜视能力"); base.Shot(); } } public class DecoratorB : Decorator { public DecoratorB(Tank tank) : base(tank) { } public override void Shot() { System.Console.WriteLine("增加夜视能力"); base.Shot(); } } *///调用 Bll.Decorator.Tank t50 = new Bll.Decorator.T50(); Bll.Decorator.ConcreteDecoratorA concreteDecoratorA = new Bll.Decorator.ConcreteDecoratorA(); Bll.Decorator.ConcreteDecoratorB concreteDecoratorB = new Bll.Decorator.ConcreteDecoratorB(); concreteDecoratorA.SetComponent(t50); concreteDecoratorB.SetComponent(concreteDecoratorA); concreteDecoratorB.Shot();