|
public RestoreFromMemento ( |
||
| memento | ||
| return | string | |
public string Undo()
{
if (currentArticle > 0)
{
currentArticle -= 1;
}
Memento prev = caretaker.Get(currentArticle);
string prevArticle = originator.RestoreFromMemento(prev);
return(prevArticle);
}
static void Main(string[] args)
{
var savedStates = new List <Originator.Memento>();
var originator = new Originator();
originator.Set("State #1");
originator.Set("State #2");
savedStates.Add(originator.SaveToMemento());
originator.Set("State #3");
savedStates.Add(originator.SaveToMemento());
originator.Set("State #4");
originator.RestoreFromMemento(savedStates.Last());
Console.ReadLine();
}
// 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);
}
public static void Main(string[] args)
{
Caretaker caretaker = new Caretaker();
Originator org = new Originator("Memento Pattern", "Gruppe 0", "This is just a test", DateTime.UtcNow);
org.PrintState();
caretaker.Save(org.SaveToMemento());
Thread.Sleep(3000);
org.Description = "The pattern can be used for many things like this.";
org.Author = "Gruppe 25";
caretaker.Save(org.SaveToMemento());
org.PrintState();
Thread.Sleep(2000);
org.Description = "The pattern can be used for many thi...";
org.Author = "Gruppe 26";
org.PrintState();
caretaker.Save(org.SaveToMemento());
Thread.Sleep(1000);
org.Description = "The pattern can be used for am back to ear....";
org.PrintState();
Thread.Sleep(1000);
Console.WriteLine("\n\nRolling back two changes -> result:\n ");
org.RestoreFromMemento(caretaker.Restore(1));
org.PrintState();
}
