public abstract class IgoChessman{public abstract string GetColor();public void Display(Coordinates coord){Console.WriteLine("棋子颜色：{0}，棋子位置：{1}", GetColor(), coord.X + "," + coord.Y);}}/// <summary>/// 外部状态：棋子坐标/// </summary>public class Coordinates{public int X { get; set; }public int Y { get; set; }public Coordinates(){}public Coordinates(int x, int y){this.X = x;this.Y = y;}}

    // 具体享元类Apublic class BlackIgoChessman : IgoChessman{public override string GetColor(){return "黑色";}}// 具体享元类Bpublic class WhiteIgoChessman : IgoChessman{public override string GetColor(){return "白色";}}

    /// <summary>/// 享元工厂类/// </summary>public class IgoChessmanFactory{private static readonly IgoChessmanFactory instance = new IgoChessmanFactory(); // 使用单例模式实现享元private static Hashtable ht;    // 使用Hashtable来存储享元对象，充当享元池private IgoChessmanFactory(){ht = new Hashtable();IgoChessman blackChess = new BlackIgoChessman();ht.Add("b", blackChess);IgoChessman whiteChess = new WhiteIgoChessman();ht.Add("w", whiteChess);}public static IgoChessmanFactory GetInstance(){return instance;}public IgoChessman GetIgoChessman(string color){IgoChessman chess = ht[color] as IgoChessman;return chess;}}

    public class Program{public static void Main(string[] args){// 获取享元工厂IgoChessmanFactory chessFactory = IgoChessmanFactory.GetInstance();// 通过享元工厂获取3颗黑子IgoChessman blackChess1 = chessFactory.GetIgoChessman("b");IgoChessman blackChess2 = chessFactory.GetIgoChessman("b");IgoChessman blackChess3 = chessFactory.GetIgoChessman("b");Console.WriteLine("判断两颗黑子是否相同：{0}", object.ReferenceEquals(blackChess1, blackChess2));// 通过享元工厂获取2颗白子IgoChessman whiteChess1 = chessFactory.GetIgoChessman("w");IgoChessman whiteChess2 = chessFactory.GetIgoChessman("w");Console.WriteLine("判断两颗白子是否相同：{0}", object.ReferenceEquals(whiteChess1, whiteChess2));// 显示棋子blackChess1.Display(new Coordinates(1,2));blackChess2.Display(new Coordinates(3, 4));blackChess3.Display(new Coordinates(1, 3));whiteChess1.Display(new Coordinates(2, 5));whiteChess2.Display(new Coordinates(2, 4));Console.ReadKey();}}

作者：周旭龙

出处：http://edisonchou.cnblogs.com

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