// Intent: Without violating encapsulation, capture and externalize
// an object's internal state so that the object can be restored
// to this state later.
//
// Memento存储Originator的状态
// Originator创建一个Memento，记录状态；使用Memento恢复状态
// CareTaker拥有Memento，负责存取
static void Main(string[] args)
{
var originator = new Originator {
State = "Original State"
};
Console.WriteLine(originator.State);
var caretaker = new Caretaker();
caretaker.SaveMemento(originator.CreateMemento());
originator.State = "New State";
Console.WriteLine(originator.State);
originator.RestoreFromMemento(caretaker.OriginatorMemento);
Console.WriteLine(originator.State);
}
