Program.cs

using System;

namespace MementoPattern
{
    public class Program
    {
        public static void Main(string[] args)
        {
            #region Prototype

            var originator = new Originator
            {
                State = "On"
            };
            originator.Show();

            var caretaker = new Caretaker
            {
                Memento = originator.CreateMemento()
            };

            originator.State = "Off";
            originator.Show();

            originator.SetMemento(caretaker.Memento);
            originator.Show();

            Console.WriteLine();

            #endregion Prototype

            var lixiaoyao = new GameRole();
            lixiaoyao.StateDisplay();

            //保存状态
            var stateCaretasker = new RoleStateCarertaker
            {
                Memento = lixiaoyao.SaveState()
            };

            // 大战 Boss
            lixiaoyao.FightWithBoss();
            lixiaoyao.StateDisplay();

            // 快被 Boss 打挂了，恢复之前的状态，继续打
            lixiaoyao.RecoveryState(stateCaretasker.Memento);
            lixiaoyao.StateDisplay();

            Console.ReadLine();
        }
    }
}