C# デザインパターン Command

namespace ConsoleApplication2
{
    class Program
    {
        static void Main(string[] args)
        {
            Command command = new ConcreateCommand();
            Receiver receiver = new ConcreateReceiver();

            command.SetReceiver(receiver);

            Invoker invoker = new Invoker(command);
            invoker.execute();
        }
    }

    /* Command 
    他のオブジェクトへのメソッド呼び出しとパラメータをオブジェクト化する。 */

    public class Invoker // Commandの呼び出し
    {
        private Command command;

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

        public void execute()
        {
            this.command.Execute();
        }
    }

    public interface Command //命令
    {
        void SetReceiver(Receiver receiver);
        void Execute();
    }
    
    public class ConcreateCommand: Command // 具体的な命令
    {
        Receiver receiver;

        public void SetReceiver(Receiver receiver)
        {
            this.receiver = receiver;
        }

        public void Execute()
        {
            receiver.Action();
        }
    }

    public interface Receiver //Commandの受信者
    {
        void Action();
    }
    public class ConcreateReceiver : Receiver //具体的な受信者
    {
        public void Action()
        {

        }
    }
}

namespace ConsoleApplication2

{

class Program

{

static void Main(string[] args)

{

Command command = new ConcreateCommand();

Receiver receiver = new ConcreateReceiver();

command.SetReceiver(receiver);

Invoker invoker = new Invoker(command);

invoker.execute();

}

/* Command

他のオブジェクトへのメソッド呼び出しとパラメータをオブジェクト化する。 */

public class Invoker // Commandの呼び出し

{

private Command command;

public Invoker(Command command)

{

this.command = command;

}

public void execute()

{

this.command.Execute();

}

public interface Command //命令

{

void SetReceiver(Receiver receiver);

void Execute();

}

public class ConcreateCommand: Command // 具体的な命令

{

Receiver receiver;

public void SetReceiver(Receiver receiver)

{

this.receiver = receiver;

}

public void Execute()

{

receiver.Action();

}

public interface Receiver //Commandの受信者

{

void Action();

}

public class ConcreateReceiver : Receiver //具体的な受信者

{

public void Action()

{

}

ざっくりまとめると、commandにreceiverを渡す。(commandがreceiverを保持)
渡し方は、Command cmd = new ConcreateCommand(receiver)
あるいは、上記のようなSetReceiver(receiver)とか。
そして、commandのExecute()の中でreceiverのAction()を呼ぶ。
Invokerは呼び出しで、そこからcommandのExecute()を呼ぶ。
処理の実体はreceiverのAction()の中。