static void Main(string[] args)
{
// Клиентский код.
Originator originator = new Originator("Super-duper-super-puper-super.");
Caretaker caretaker = new Caretaker(originator);
caretaker.Backup();
originator.DoSomething();
caretaker.Backup();
originator.DoSomething();
caretaker.Backup();
originator.DoSomething();
Console.WriteLine();
caretaker.ShowHistory();
Console.WriteLine("\nClient: Now, let's rollback!\n");
caretaker.Undo();
Console.WriteLine("\n\nClient: Once more!\n");
caretaker.Undo();
Console.WriteLine();
}
public void Undo()
{
var memento = _caretaker.Undo();
if (memento != null)
{
_originator.RestoreState(memento);
}
Console.WriteLine($"Current state: {GetStateValue()}");
}