oop中的多对多关系

Question

什么是建立多对多关系的最佳方式？

假设我们有两个类,Team和Player

• 任何给定的玩家可以在多个团队小号
• 任何团队可以有很多球员 S作为他们喜欢

我喜欢称之为的方法

• playerX.getTeamList()获取他/她所在团队的名单
• teamY.getPlayerList()获取团队中所有玩家的列表

(或者有其他方式有效地做到这一点)

我可以想到两种方法,但他们感觉不像是一个好的oop pattens.你能想到任何好方法吗,也许是设计模式？

Answer 1

球员和球队之间的关系形成了二分图.期待评论(和downvotes？)!我是OOD noob.

    class MyPlayer
    {
        public string Name { get; set; }

        public MyPlayer(string n)
        {
            Name = n;
        }
    }

    class MyTeam
    {
        public string Name { get; set; }

        public MyTeam(string n)
        {
            Name = n;
        }
    }

    class PlayerTeamPair
    {
        public MyPlayer Player { get; set; }
        public MyTeam Team { get; set; }

        public PlayerTeamPair(MyPlayer p,MyTeam t)
        {
            Player = p;
            Team  = t;
        }
    }

    class PlayerTeamBipartiteGraph
    {
        public List<PlayerTeamPair> Edges { get; set; }

        public PlayerTeamBipartiteGraph()
        {
            Edges = new List<PlayerTeamPair>();
        }

        public void AddPlayerAndTeam(MyPlayer p, MyTeam t)
        {
            Edges.Add(new PlayerTeamPair(p, t));
        }

        public List<MyTeam> GetTeamList(MyPlayer p)
        {
            var teams = from e in Edges where e.Player == p select e.Team;
            return teams.ToList<MyTeam>();
        }

        public List<MyPlayer> GetPlayerList(MyTeam t)
        {
            var players = from e in Edges where e.Team == t select e.Player;
            return players.ToList<MyPlayer>();
        }

    }


    class Program
    {
        static void Main(string[] args)
        {
            var G = new PlayerTeamBipartiteGraph();

            MyPlayer a = new MyPlayer("A");
            MyPlayer b = new MyPlayer("B");
            MyPlayer c = new MyPlayer("C");
            MyPlayer d = new MyPlayer("D");

            MyTeam t1 = new MyTeam("T1");
            MyTeam t2 = new MyTeam("T2");

            G.AddPlayerAndTeam(a, t1);
            G.AddPlayerAndTeam(b, t1);
            G.AddPlayerAndTeam(c, t1);
            G.AddPlayerAndTeam(b, t2);
            G.AddPlayerAndTeam(d, t2);

            G.GetTeamList(b).ForEach(t => Console.Write(" {0} ",t.Name));
            Console.WriteLine();
            G.GetPlayerList(t2).ForEach(p => Console.Write(" {0} ",p.Name));
            Console.WriteLine();
        }
    }

Answer 2

很好，Player有收藏Team，Team有收藏Player。您需要注意添加/删除操作的完整性，因为它们不是“原子的”