using System;

namespace _15CommandPattern
{
 class Program
 {
 static void Main(string[] args)
 {
 // 初始化Receiver、Invoke和Command
 Receiver r = new Receiver();
 Command c = new ConcreteCommand(r);
 Invoke i = new Invoke(c);

 // 院领导发出命令
 i.ExecuteCommand();
 Console.WriteLine("Hello World!");
 }
 }
 // 教官,负责调用命令对象执行请求
 public class Invoke
 {
 public Command _command;

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

 public void ExecuteCommand()
 {
 _command.Action();
 }
 }

 // 命令抽象类
 public abstract class Command
 {
 // 命令应该知道接收者是谁,所以有Receiver这个成员变量
 protected Receiver _receiver;

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

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

 // 
 public class ConcreteCommand : Command
 {
 public ConcreteCommand(Receiver receiver)
 : base(receiver)
 {
 }

 public override void Action()
 {
 // 调用接收的方法,因为执行命令的是学生
 _receiver.Run1000Meters();
 }
 }

 // 命令接收者——学生
 public class Receiver
 {
 public void Run1000Meters()
 {
 Console.WriteLine("跑1000米");
 }
 }

 // 院领导


}