C#設計模式之Command設計模式（命令設計模式）(2)

三、命令模式的示意性源代碼

// Command pattern -- Structural example　
using System;
// "Command"
abstract class Command
{
　// FIElds
　protected Receiver receiver;
　// Constructors
　public Command( Receiver receiver )
　{
　　this.receiver = receiver;
　}
　// Methods
　abstract public void Execute();
}
// "ConcreteCommand"
class ConcreteCommand : Command
{
　// Constructors
　public ConcreteCommand( Receiver receiver ) :
　　base ( receiver ) {}
　// Methods
　public override void Execute()
　{
　　receiver.Action();
　}
}
// "Receiver"
class Receiver
{
　// Methods
　public void Action()
　{
　　Console.WriteLine("Called Receiver.Action()");
　}
}
// "Invoker"
class Invoker
{
　// FIElds
　private Command command;
　// Methods
　public void SetCommand( Command command )
　{
　　this.command = command;
　}
　public void ExecuteCommand()
　{
　　command.Execute();
　}
}
/**//// <summary>
///　ClIEnt test
/// </summary>
public class ClIEnt
{
　public static void Main( string[] args )
　{
　　// Create receiver, command, and invoker
　　Receiver r = new Receiver();
　　Command c = new ConcreteCommand( r );
　　Invoker i = new Invoker();
　　// Set and execute command
　　i.SetCommand(c);
　　i.ExecuteCommand();
　}
}