装饰模式

public abstract class Component { public abstract void Operation(); }

-component

ConcreteDecoratorA

-addedState：String

+ operation()

ConcreteComponent

public abstract class Decorator : Component { protected Component component; public void SetComponent(Component component) { this.component = component; } public override void Operation() { if (component != null) { component.Operation(); } } }

ConcreteDecoratorB

+ operation()-addedBehavor()

public class ConcreteDecoratorA : Decorator { private string addedState; public override void Operation() { base.Operation(); addedState = \"A New State\"; Console.WriteLine($\"具体装饰对象A的操作：{addedState}\"); } }

 public class ConcreteComponent : Component { public override void Operation() { Console.WriteLine(\"具体对象的操作\"); } }

Decorator，装饰抽象类，继承了Component，从外类来扩展Component的功能，但对Component来说，是无需知道Decorator的功能的

Component定义一个对象接口，可以给这些对象动态添加职责

ConcreteComponent定义了一个具体对象，也可以给这个对象添加一些职责

Component

ConcreteDecorator是具体的装饰对象，起到给Decorator添加职责的功能

Decorator

 //装饰模式 ConcreteComponent concreteComponent = new ConcreteComponent(); ConcreteDecoratorA concreteDecoratorA = new ConcreteDecoratorA(); ConcreteDecoratorB concreteDecoratorB = new ConcreteDecoratorB(); concreteDecoratorA.SetComponent(concreteComponent); concreteDecoratorB.SetComponent(concreteDecoratorA); concreteDecoratorB.Operation();

public class ConcreteDecoratorB : Decorator { public override void Operation() { base.Operation(); AddedBehavoior(); Console.WriteLine(\"具体装饰对象B的操作\"); } private void AddedBehavoior() { Console.WriteLine(\"B的方法\"); } }