備忘錄模式(Memento)

using System;

namespace DPExample
{
 class GameRole
 {
  // 生命力
  private int vit;
  public int Vitality {
   get { return vit; }
   set { vit = value; }
  }

  // 攻擊力
  private int atk;
  public int Attack {
   get { return atk; }
   set { atk = value; }
  }

  // 防禦力
  private int def;
  public int Defense {
   get { return def; }
   set { def = value; }
  }

  // 狀態顯示
  public void StateDisplay()
  {
   Console.WriteLine ("角色當前狀態：");
   Console.WriteLine ("體力：{0}", this.vit);
   Console.WriteLine ("攻擊力：{0}", this.atk);
   Console.WriteLine ("防禦力：{0}", this.def);
   Console.WriteLine ("");
  }

  // 獲得初始狀態
  public void GetInitState()
  {
   this.vit = 100;
   this.atk = 100;
   this.def = 100;
  }

  // 戰鬥
  public void Fight()
  {
   if (this.vit > 0) this.vit -= 20;
   if (this.atk > 0) this.atk -= 20;
   if (this.def > 0) this.def -= 20;
  }

  // 保存角色狀態
  public RoleStateMemento SaveState()
  {
   return (new RoleStateMemento(vit, atk, def));
  }

  // 恢復角色狀態
  public void RecoveryState(RoleStateMemento memento)
  {
   this.vit = memento.Vitality;
   this.atk = memento.Attack;
   this.def = memento.Defense;
  }
 }

 // 角色狀態儲存箱
 class RoleStateMemento
 {
  private int vit;
  public int Vitality {
   get { return vit; }
   set { vit = value; }
  }

  private int atk;
  public int Attack {
   get { return atk; }
   set { atk = value; }
  }

  private int def;
  public int Defense {
   get { return def; }
   set { def = value; }
  }

  public RoleStateMemento (int vit, int atk, int def)
  {
   this.vit = vit;
   this.atk = atk;
   this.def = def;
  }
 }

 // 角色狀態管理者
 class RoleStateCaretaker
 {
  private RoleStateMemento memento;
  public RoleStateMemento Memento {
   get { return memento; }
   set { memento = value; }
  }
 }
}