C# 设计模式中的命令模式 问题求解~~

[peng2739956]

刚刚看完了命令模式 写了个小小的例子 突然发现不改源码能变功能 但是要加功能的话 还得改源码 求解怎么不改源码添加功能
//发送者

using System;
using System.Collections.Generic;
using System.Text;

namespace Command
{
    public class Command_Sample01
    {
        public void Open()
        {
            Console.WriteLine("播放");
        }
        public void Close()
        {
            Console.WriteLine("暂停");
        }
    }
}

//功能实现

using System;
using System.Collections.Generic;
using System.Text;

namespace Command
{
    public class TVcloseCommand:AbstractCommand
    {

        private Command_Sample01 tv;
        public TVcloseCommand()
        {
            tv = new Command_Sample01();
        }
        public void Execute()
        {
            tv.Close();
        }

       
    }
}

using System;
using System.Collections.Generic;
using System.Text;

namespace Command
{
    public class TvOpenCommand:AbstractCommand
    {

        #region AbstractCommand 成员
        private Command_Sample01 tv;
        public TvOpenCommand()
        {
            tv = new Command_Sample01();
        }
        public void Execute()
        {
            tv.Open();
        }

        #endregion
    }
}

//接口

using System;
using System.Collections.Generic;
using System.Text;

namespace Command
{
    public interface AbstractCommand
    {
        void Execute();
    }
}

//接收者

using System;
using System.Collections.Generic;
using System.Text;

namespace Command
{
    public class Controller
    {
        private AbstractCommand openCommand, CloseCommand;
        public Controller(AbstractCommand openCommand, AbstractCommand CloseCommand)
        {
            this.openCommand = openCommand;
            this.CloseCommand = CloseCommand;
        }
        public void Open()
        {
            openCommand.Execute();
        }
        public void Close()
        {
            CloseCommand.Execute();
        }
    }
}

//客户代码

using System;
using System.Collections.Generic;
using System.Text;
using System.Configuration;
using System.Reflection;
namespace Command
{
    class Program
    {
        static void Main(string[] args)
        {
            AbstractCommand openCommand, CloseCommand;
            string open = ConfigurationManager.AppSettings["TvOpenClass"];
            openCommand = (AbstractCommand)Assembly.Load("Command").CreateInstance(open);
            string Close = ConfigurationManager.AppSettings["TvCloseClass"];
            CloseCommand = (AbstractCommand)Assembly.Load("Command").CreateInstance(Close);
            //string Control = ConfigurationManager.AppSettings["Conntrol"];
            //Controller control = (Controller)Assembly.Load("Command").CreateInstance(Control);            
            Controller control = new Controller(openCommand, CloseCommand);
            control.Open();
            control.Close();
            Console.Read();
        }
    }
}

求解 加功能 不修改源码 怎么弄！

[cf370697816]

添加功能 肯定要加代码啊

[threenewbee]

将更多的功能放入独立的dll

反射加载，转换成基类（或者接口），调用。

建议使用工厂模式。