C# 设计模式（19）备忘模式

备忘模式

代码实现：

实体类：

    public class War3
    {
        public string Race { get; set; }
        public string Hero { get; set; }
        public string Army { get; set; }
        public string Resource { get; set; }

        public void Show()
        {
            Console.WriteLine($"种族： {Race},英雄：{Hero},军队：{Army},资源：{Resource}");
        }

        public void SaveCurrentProgress(string name)
        {
            MementoWar3 mementoWar3 = new MementoWar3(Hero,Army,Resource);
            Caretaker.AddMementoWar3(name,mementoWar3);
        }

        public void LoadHistoryProgress(string name)
        {
            var mementoWar3 = Caretaker.GetMementoWar3(name);
            this.Hero = mementoWar3.Hero;
            this.Army = mementoWar3.Army;
            this.Resource = mementoWar3.Resource;
        }
    }

备忘类+守护类：

    public class MementoWar3
    {
        public string Hero { get; set; }
        public string Army { get; set; }
        public string Resource { get; set; }

        public MementoWar3(string hero,string army,string resource)
        {
            Hero = hero;
            Army = army;
            Resource = resource;
        }
    }

    public class Caretaker
    {
        private static readonly Dictionary<string,MementoWar3> DictMementoWar3 = new Dictionary<string, MementoWar3>();

        public static void AddMementoWar3(string name, MementoWar3 mementoWar3)
        {
            DictMementoWar3.Add(name,mementoWar3);
        }

        public static MementoWar3 GetMementoWar3(string name)
        {
            return DictMementoWar3.ContainsKey(name) ? DictMementoWar3[name] : null;
        }
    }

代码调用：

    class Program
    {
        static void Main(string[] args)
        {
            War3 war3 = new War3()
            {
                Race = "兽族",
                Hero = "剑圣",
                Army = "2个大G",
                Resource = "200G 200W"
            };

            Console.WriteLine("开局...");
            war3.Show();
            war3.SaveCurrentProgress("Start");

            Console.WriteLine("MF...");
            war3.Hero = "剑圣 小Y";
            war3.Army = "5个大G，3个狼骑，1个白牛";
            war3.Resource = "500G 500W";
            war3.Show();
            war3.SaveCurrentProgress("MF");

            Console.WriteLine("FinalFire...");
            war3.Hero = "剑圣 小Y 老牛";
            war3.Army = "5个大G，3个狼骑，1个白牛";
            war3.Resource = "500G 500W";
            war3.Show();
            war3.SaveCurrentProgress("FinalFire");

            Console.WriteLine("回到MF"); 
            war3.LoadHistoryProgress("MF");
            war3.Show();

            Console.WriteLine("回到开局"); 
            war3.LoadHistoryProgress("Start");
            war3.Show();
        }
    }

结果：