static void Main(string[] args)
{
// Create an originator.
var originator = new Originator <SalesProspect>();
// Create a caretaker with passed originator instance.
var caretaker = new Caretaker <SalesProspect>(originator);
// Create sales prospect
var salesProspect1 = new SalesProspect("SalesProspect1", "7760", 25000);
var salesProspect2 = new SalesProspect("SalesProspect2", "1210", 11000);
var salesProspect3 = new SalesProspect("SalesProspect3", "2584", 50000);
// Set state to salesProspect1.
originator.SetState(salesProspect1);
// Save state.
var memento1 = caretaker.Save();
// Set state to salesProspect2.
originator.SetState(salesProspect2);
var memento2 = caretaker.Save();
// Set state to salesProspect3.
originator.SetState(salesProspect3);
var memento3 = caretaker.Save();
// Restore state back to salesProspect2.
caretaker.Restore(memento2);
// Restore state back to salesProspect1.
caretaker.Restore(memento1);
Console.Read();
}
static void Main(string[] args)
{
//何时使用：很多时候我们总是需要记录一个对象的内部状态，这样做的目的就是为了允许用户取消不确定或者错误的操作，能够恢复到他原先的状态，使得他有"后悔药"可吃。
Originator originator = new Originator();
CareTaker careTaker = new CareTaker();
originator.SetState("State #1");
originator.SetState("State #2");
careTaker.Add(originator.SaveStateToMemento());
originator.SetState("State #3");
careTaker.Add(originator.SaveStateToMemento());
originator.SetState("State #4");
Console.WriteLine("Current State: " + originator.GetState());
originator.GetStateFromMemento(careTaker.Get(0));
Console.WriteLine("First saved State: " + originator.GetState());
originator.GetStateFromMemento(careTaker.Get(1));
Console.WriteLine("Second saved State: " + originator.GetState());
Console.ReadLine();
}
