static void Main(string[] args)
{
Message aMessage = new Message(1, "a");
Message bMessage = new Message(2, "b");
Message cMessage = new Message(3, "c");
Message dMessage = new Message(4, "d");
ICommand aCommand = new ConcreateCommand(Action.Delete, aMessage);
ICommand bCommand = new ConcreateCommand(Action.Insert, bMessage);
ICommand cCommand = new ConcreateCommand(Action.Delete, cMessage);
ICommand dCommand = new ConcreateCommand(Action.Insert, dMessage);
Invoker aInvoker = new Invoker();
aInvoker.Do(aCommand);
aInvoker.Do(bCommand);
aInvoker.Do(cCommand);
aInvoker.Do(dCommand);
aInvoker.UnDo(1);
aInvoker.UnDo(1);
Console.ReadKey();
}
