using System;using System.Collections.Generic;using System.Linq;using System.Text;namespace 裝飾者{  class Program  {    static void Main(string[] args)    {      ConcreteComponent con = new ConcreteComponent();      ConcreteDecoratorA a = new ConcreteDecoratorA();      a.SetComponent(con);      a.Operation();      a.AddBehavior();      Console.WriteLine("============================");      ConcreteDecoratorB B = new ConcreteDecoratorB();      B.SetComponent(a);      a.AddBehavior();      B.Operation();      B.AddBehavior();    }    public abstract class Component    {      public abstract void Operation();    }    abstract class Decorator : Component    {      private Component component;      public void SetComponent(Component component)      {        this.component = component;      }      public override void Operation()      {        if (component != null)        {          component.Operation();        }      }    }    class ConcreteDecoratorA : Decorator    {      public override void Operation()      {        base.Operation();      }      public void AddBehavior()      {        Console.WriteLine("裝飾A類的操作！");      }    }    class ConcreteDecoratorB : Decorator    {      public override void Operation()      {        base.Operation();      }      public void AddBehavior()      {        Console.WriteLine("裝飾B類的操作！");      }    }    public class ConcreteComponent : Component    {      public override void Operation()      {        Console.WriteLine("具體對象的操作！");      }    }  }}