public DateTime Snapshot()
{
DateTime rollbackTime = DateTime.Now;
CharacterMemento memento = _character.Export();
_snapshots.Insert(0, rollbackTime, memento);
return(rollbackTime);
}
public void Rollback(DateTime snapshotTime)
{
CharacterMemento targetMemento = null;
foreach (DictionaryEntry snapshot in _snapshots)
{
DateTime time = (DateTime)snapshot.Key;
CharacterMemento memento = (CharacterMemento)snapshot.Value;
if (time <= snapshotTime)
{
targetMemento = memento;
}
}
if (targetMemento != null)
{
_character.Import(targetMemento);
}
}