无废话C#设计模式之十八：Command
2009-04-02 08:23:06 来源：WEB开发网示例代码
using System;
using System.Collections.Generic;
using System.Text;
namespace CommandExample
{
class Program
{
static void Main(string[] args)
{
Man man = new Man();
Server server = new Server();
server.Execute(new MoveForward(man, 10));
System.Threading.Thread.Sleep(50);
server.Execute(new MoveRight(man, 10));
server.Execute(new MoveBackward(man, 10));
server.Execute(new MoveLeft(man, 10));
}
}
class Man
{
private int x = 0;
private int y = 0;
public void MoveLeft(int i) { x -= i; }
public void MoveRight(int i) { x += i; }
public void MoveForward(int i) { y += i; }
public void MoveBackward(int i) { y -= i; }
public void GetLocation()
{
Console.WriteLine(string.Format("({0},{1})", x, y));
}
}
abstract class GameCommand
{
private DateTime time;
public DateTime Time
{
get { return time; }
set { time = value; }
}
protected Man man;
public Man Man
{
get { return man; }
set { man = value; }
}
public GameCommand(Man man)
{
this.time = DateTime.Now;
this.man = man;
}
public abstract void Execute();
public abstract void UnExecute();
}
class MoveLeft : GameCommand
{
int step;
public MoveLeft(Man man, int i) : base(man) { this.step = i; }
public override void Execute()
{
man.MoveLeft(step);
}
public override void UnExecute()
{
man.MoveRight(step);
}
}
class MoveRight : GameCommand
{
int step;
public MoveRight(Man man, int i) : base(man) { this.step = i; }
public override void Execute()
{
man.MoveRight(step);
}
public override void UnExecute()
{
man.MoveLeft(step);
}
}
class MoveForward : GameCommand
{
int step;
public MoveForward(Man man, int i) : base(man) { this.step = i; }
public override void Execute()
{
man.MoveForward(step);
}
public override void UnExecute()
{
man.MoveBackward(step);
}
}
class MoveBackward : GameCommand
{
int step;
public MoveBackward(Man man, int i) : base(man) { this.step = i; }
public override void Execute()
{
man.MoveBackward(step);
}
public override void UnExecute()
{
man.MoveForward(step);
}
}
class Server
{
GameCommand lastCommand;
public void Execute(GameCommand cmd)
{
Console.WriteLine(cmd.GetType().Name);
if (lastCommand !=null && (TimeSpan)(cmd.Time - lastCommand.Time) < new TimeSpan(0, 0, 0, 0, 20))
{
Console.WriteLine("Invalid command");
lastCommand.UnExecute();
lastCommand = null;
}
else
{
cmd.Execute();
lastCommand = cmd;
}
cmd.Man.GetLocation();
}
}
}
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