c# 備忘錄模式

結構圖：

Memento類：儲存狀態的容器複製代碼 代碼如下: class Memento
{
public string State { get; set; }
public Memento(string state)
{
this.State = state;
}
}

Caretaker是儲存Memento類：複製代碼 代碼如下: class Caretaker
{
public Memento Memento { get; set; }
}

Originator類就是需要儲存狀態的類：複製代碼 代碼如下: class Originator
{
public string State { get; set; }
public Memento CreateMemento()
{
return (new Memento(State));
}
public void SetMemento(Memento memento)
{
State = memento.State;
}
public void Show()
{
Console.WriteLine("State:" + State);
}
}

主函數調用：複製代碼 代碼如下: class Program
{
static void Main(string[] args)
{
Originator o = new Originator();
o.State = "On";
o.Show();
Caretaker c = new Caretaker();
c.Memento = o.CreateMemento();
o.State = "off";
o.Show();
o.SetMemento(c.Memento);
o.Show();
Console.ReadKey();
}
}