命令模式就是通过封装方法调用，我们可以把类装成形，调用此类的对象，我们不需要关心此对象里面是如何运作的
代码如下简单的命令模式：
/***********************************simple命令模式**************************************/
//创建灯开关类
public class Light
{
string location;
public Light(string location)
{
this.location = location;
}
public string On()
{
return location + " is on";
}
public string Off()
{
return location + " is off";
}
}
//创建接口命令
public interface Command
{
object execute();
}
//创建灯开关命令
public class LightOnCommand:Command
{
Light light;
public LightOnCommand(Light light)
{
this.light = light;
}
public object execute()
{
return light.On();
}
}
//使用命令对象
public class SimpleLightControl
{
Command cmd;
public SimpleLightControl(){}
public void setCommand(Command command)
{
cmd = command;
}
public string buttonWasPressed()
{
return cmd.execute().ToString();
}
}
使用该方法
public class LightControlTest
{
public static void Main()
{
string lightWas;
SimpleLightControl lightControl = new SimpleLightControl();//调用者
Light light = new Light("door");//对象
LightOnCommand lightCmd = new LightOnCommand(light);//请求命令接受对象
lightControl.setCommand(lightCmd);//把命令传给调用者
lightWas = lightControl.buttonWasPressed();//模拟按钮按下
Console.WriteLine(lightWas);
}
}
public class LightControlTest
{
public static void Main()
{
string lightWas;
SimpleLightControl lightControl = new SimpleLightControl();//调用者
Light light = new Light("door");//对象
LightOnCommand lightCmd = new LightOnCommand(light);//请求命令接受对象
lightControl.setCommand(lightCmd);//把命令传给调用者
lightWas = lightControl.buttonWasPressed();//模拟按钮按下
Console.WriteLine(lightWas);
}
}
{
public static void Main()
{
string lightWas;
SimpleLightControl lightControl = new SimpleLightControl();//调用者
Light light = new Light("door");//对象
LightOnCommand lightCmd = new LightOnCommand(light);//请求命令接受对象
lightControl.setCommand(lightCmd);//把命令传给调用者
lightWas = lightControl.buttonWasPressed();//模拟按钮按下
Console.WriteLine(lightWas);
}
}
/***********************************复杂点命令模式 *********************************************/
//创建接口命令
//创建接口命令
public interface Command
{
object execute();
}
//创建无命令类
public class NoCommand:Command
{
public NoCommand()
{ }
#region Command Members
public object execute()
{
return null;
}
#endregion
}
//创建灯开关类
//创建灯开关类
public class Light
{
string location;
public Light(string location)
{
this.location = location;
}
public string On()
{
return location + " is on";
}
public string Off()
{
return location + " is off";
}
}
//创建灯开关命令
public class LightOnCommand:Command
{
Light light;
public LightOnCommand(Light light)
{
this.light = light;
}
public object execute()
{
return light.On();
}
}
//创建关灯命令
public class LightOffCommand:Command
{
Light light;
public LightOffCommand(Light light)
{
this.light = light;
}
public object execute()
{
return light.Off();
}
}
// 车库门
//车库门
public class GarageDoor
{
string location;
public GarageDoor(string location)
{
this.location = location;
}
public string Up()
{
return location + " is up";
}
public string Down()
{
return location + " is down";
}
public string Stop()
{
return location + " movement is stopped";
}
public string LightOn()
{
return location + " light is on";
}
public string LightOff()
{
return location + " light is off";
}
}
//车库门下
public class GarageDoorDownCommand:Command
{
GarageDoor garageDoor;
public GarageDoorDownCommand(GarageDoor garageDoor)
{
this.garageDoor = garageDoor;
}
#region Command Members
public object execute()
{
return garageDoor.Down();
}
#endregion
}
//车库门上
public class GarageDoorUpCommand:Command
{
GarageDoor garageDoor;
public GarageDoorUpCommand(GarageDoor garageDoor)
{
this.garageDoor = garageDoor;
}
#region Command Members
public object execute()
{
return garageDoor.Up();
}
#endregion
}
//创建控制命令
public class ControlCommand
{
Command[] onCommands;
Command[] offCommands;
public ControlCommand()
{
onCommands = new Command[2];
offCommands = new Command[2];
Command noCommand = new NoCommand();
for (int i=0;i<2;i++)
{
onCommands[i] = noCommand;
offCommands[i] = noCommand;
}
}
public void SetCommand(int slot,Command onCommand,Command offCommand)
{
onCommands[slot] = onCommand;
offCommands[slot] = offCommand;
}
public object OnButtonWasPushed(int slot)
{
return onCommands[slot].execute();
}
public object OffButtonWasPushed(int slot)
{
return offCommands[slot].execute();
}
public string toString()
{
StringBuilder sb = new StringBuilder();
sb.Append("\n------ Remote Control -------\n");
for (int i = 0; i < onCommands.Length; i++)
{
sb.Append("[slot " + i + "] " + onCommands[i].GetType().Name
+ " " + offCommands[i].GetType().Name + "\n");
}
return sb.ToString();
}
}
//调用命令模式
public class ControlCommandTest
{
public static void Main()
{
Light light = new Light("light");//创建灯
LightOnCommand lightOnCmd = new LightOnCommand(light);
LightOffCommand lightOffCmd = new LightOffCommand(light);
GarageDoor door = new GarageDoor("Garage door");
GarageDoorDownCommand doorDownCmd = new GarageDoorDownCommand(door);
GarageDoorUpCommand doorUpCmd = new GarageDoorUpCommand(door);
ControlCommand controlCmd = new ControlCommand();
controlCmd.SetCommand(0, lightOnCmd, lightOffCmd);
controlCmd.SetCommand(1, doorDownCmd,doorUpCmd);
Console.WriteLine(controlCmd.OnButtonWasPushed(0).ToString());
Console.WriteLine(controlCmd.OffButtonWasPushed(0).ToString());
Console.WriteLine(controlCmd.OnButtonWasPushed(1).ToString());
Console.WriteLine(controlCmd.OffButtonWasPushed(1).ToString());
Console.WriteLine(controlCmd.toString());
}
}
