C#设计模式--命令模式（学习Learning hard C#设计模式笔记）

原文地址http://www.cnblogs.com/zhili/p/CommandPattern.html

class Program
    {
        static void Main(string[] args)
        {
            //实现命令的人 执行命令的人，下命令的人
            Receiver receiver = new Receiver();
            Command command = new ConcreateCommand(receiver);
            Invoke invoke = new Invoke(command);

            //下命令
            invoke.ExecuteCommand();

            Console.Read();
        }
    }

    //教官 负责调用命令执行任务
    public class Invoke
    {
        public Command command;

        public Invoke(Command command)
        {
            this.command = command;
        }

        public void ExecuteCommand()
        {
            command.Action();//跑步
            command.ActionTiao();//跳舞
        }
    }

      //命令抽象类
    public abstract class Command
    {
        protected Receiver receiver;

        public Command(Receiver receiver)
        {
            this.receiver = receiver;
        }

        //命令执行方法
        public abstract void Action();

        //加命令 进行扩展 跳舞 --------------扩展 跳舞
        public abstract void ActionTiao();
    }

    public class ConcreateCommand : Command
    {
        public ConcreateCommand(Receiver receiver):base(receiver)
        {
        }
        //执行命令
        public override void Action()
        {
            receiver.Run1000Meters();
        }

        //跳舞
        public override void ActionTiao()
        {
            receiver.TiaoWu();
        }
    }

    //命令有一个学生实现
    public class Receiver
    {
        public void Run1000Meters()
        {
            Console.WriteLine("跑1000米");
        }

        public void TiaoWu()
        {
            Console.WriteLine("跳舞……");
        }
    }

　　如果需要扩展，在命令类、抽象类、实现类、学生类中进行声明即可，客户端不用修改，