abstract class Command public abstract void Execute public abstract vo

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abstract class Command
{
public abstract void Execute();
public abstract void Undo();
}
// конкретная команда
class ConcreteCommand : Command
{
Receiver receiver;
public ConcreteCommand(Receiver r)
{
receiver = r;
}
public override void Execute()
{
receiver.Operation();
}
public override void Undo()
{}
}
// получатель команды
class Receiver
{
public void Operation()
{ }
}
// инициатор команды
class Invoker
{
Command command;
public void SetCommand(Command c)
{
command = c;
}
public void Run()
{
command.Execute();
}
public void Cancel()
{
command.Undo();
}
}
class Client
{
void Main()
{
Invoker invoker = new Invoker();
Receiver receiver = new Receiver();
ConcreteCommand command=new ConcreteCommand(receiver);
invoker.SetCommand(command);
invoker.Run();
}
}