using System;
using System.Collections.Generic;

namespace TestCS
{
    class Program
    {
        static void Main(string[] args)
        {
            Robot robot = new DanceRobot();
            robot.Perform();
            robot = new JumpDecorator(robot);
            robot.Perform();
            robot = new SingDecorator(robot);
            robot.Perform();
            Console.ReadKey();
        }

        abstract class Robot
        {
            public abstract void Perform();
        }

        class DanceRobot : Robot
        {
            public override void Perform()
            {
                Console.WriteLine("Dance");
            }
        }

        abstract class Decorator : Robot
        {
            protected Robot m_Robot;

            public Decorator(Robot robot)
            {
                m_Robot = robot;
            }

            public override void Perform()
            {
                if (m_Robot == null)
                {
                    return;
                }
                m_Robot.Perform();
            }
        }

        class JumpDecorator : Decorator
        {
            public JumpDecorator(Robot robot) : base(robot)
            {

            }

            public override void Perform()
            {
                base.Perform();
                Console.WriteLine("Jump"); 
            }
        }

        class SingDecorator : Decorator
        {
            public SingDecorator(Robot robot) : base(robot)
            {

            }

            public override void Perform()
            {
                base.Perform();
                Console.WriteLine("Sing");
            }
        }
    }
}
 

裝飾者模式修改版：

using System;
using System.Collections.Generic;

namespace TestCS
{
    class Program
    {
        static void Main(string[] args)
        {
            IRobot robot = new DanceRobot();
            robot.Perform();
            robot = new JumpDecorator(robot);
            robot.Perform();
            robot = new SingDecorator(robot);
            robot.Perform();
            Console.ReadKey();
        }

        interface IRobot
        {
            void Perform();
        }

        class DanceRobot : IRobot
        {
            public void Perform()
            {
                Console.WriteLine("Dance");
            }
        }

        abstract class Decorator : IRobot
        {
            protected IRobot m_Robot;

            public Decorator(IRobot robot)
            {
                m_Robot = robot;
            }

            public virtual void Perform()
            {
                if (m_Robot == null)
                {
                    return;
                }
                m_Robot.Perform();
            }
        }

        class JumpDecorator : Decorator
        {
            public JumpDecorator(IRobot robot) : base(robot)
            {

            }

            public override void Perform()
            {
                base.Perform();
                Console.WriteLine("Jump"); 
            }
        }

        class SingDecorator : Decorator
        {
            public SingDecorator(IRobot robot) : base(robot)
            {

            }

            public override void Perform()
            {
                base.Perform();
                Console.WriteLine("Sing");
            }
        }
    }
}