設計模式-行爲設計模式：備忘錄模式 Memento

備忘錄模式就是給現在的情況做一下備份，以便後期找回操作

Lol類

[Serializable]
    public class Lol
    {
        //英雄名稱
        public string Name;
        //等級
        public string Grade;

        public Lol(string name, string grade)
        {
            Name = name;
            Grade = grade;
            Console.WriteLine("英雄{0}創建完畢，進入遊戲，當前等級{1}",this.Name,this.Grade);
        }

        public void Show()
        {
            Console.WriteLine("英雄{0}當前等級{1}",this.Name,this.Grade);
        }
       
    }

序列化、反序列化類

 public class SerialzeHelper
    {
        /// <summary>
        /// 序列化
        /// </summary>
        /// <param name="target"></param>
        /// <returns></returns>
        public static string Serializable(object target)
        {
            using (MemoryStream stream = new MemoryStream())
            {
                new BinaryFormatter().Serialize(stream,target);
                return Convert.ToBase64String(stream.ToArray());
            }
        }

        /// <summary>
        /// 反序列化
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="target"></param>
        /// <returns></returns>
        public static T Derializable<T>(string target)
        {
            byte[] targetArray = Convert.FromBase64String(target);
            using(MemoryStream stream = new MemoryStream(targetArray))
            {
                return (T)(new BinaryFormatter().Deserialize(stream));
            }
        }
    }

備忘錄類

public class Pattern
    {
        private Dictionary<string, Lol> DictionaryLol = new Dictionary<string, Lol>();

        //存檔
        public void Save(string SaveName,Lol lol)
        {
            if (DictionaryLol.ContainsKey(SaveName))
            {
                //如果存在，則覆蓋原紀錄
                DictionaryLol[SaveName] = Serial(lol);
            }
            else
            { 
                //不存在該名稱記錄  直接添加
                DictionaryLol.Add(SaveName,Serial(lol));
            }
        }

        //讀檔
        public Lol Get(string SaveName)
        {
            if (DictionaryLol.ContainsKey(SaveName))
            {
                //如果存在，則覆蓋原紀錄
                return DictionaryLol[SaveName];
            }
            return null;//不存在則返回空
        }


        //對lol進行序列化之後反序列化 返回一個新的對象
        public Lol Serial(Lol lol)
        {
            return SerialzeHelper.Derializable<Lol>(SerialzeHelper.Serializable(lol));
        }

    }

操作備忘錄類

public class Execute
    {
        private Pattern pattern = null;

        public Execute()
        {
            pattern = new Pattern();
        }

        public void Save(string SaveName,Lol lol)
        {
            pattern.Save(SaveName,lol);
        }

        public Lol Get(string SaveName)
        {
            return pattern.Get(SaveName);
        }
    }

調用

Console.WriteLine("**********************開始遊戲***************************");
            Lol l = new Lol("卡特琳娜","1");
            l.Grade = "3";//升到3級 
            l.Show();//展示一下
            Execute e = new Execute();
            e.Save("3級存檔",l);

            l.Grade = "5";//升到3級 
            l.Show();//展示一下
            e.Save("5級存檔", l);
            Console.WriteLine("**********************讀取3級存檔***************************");
            l=e.Get("3級存檔");
            l.Show();
            Console.WriteLine("**********************讀取5級存檔***************************");
            l = e.Get("5級存檔");
            l.Show();

結果