C# 实体框架6.1韩元'；不创建连接表

作为一个学习练习，我正在尝试创建一个国际象棋网站。我正在使用EntityFramework6.1来存储记录，但在创建迁移时遇到了困难，这与我所认为的应该是一样的

我希望能够检索一个玩家和该玩家玩过的所有游戏的列表

public class Game
{
    public int Id { get; set; }
    // Other Properties
    public virtual Player White { get; protected set; }
    public virtual Player Black { get; protected set; }

    public Game(Player white, Player black) : this()
    {
        // Null checks

        White = white;
        Black = black;

        White.Games.Add(this);
        Black.Games.Add(this);
    }
}

public class Player
{
    public int Id { get; set; }
    // Other Properties
    public virtual ICollection<Game> Games { get; protected set; }

    protected Player()
    {
        Games = new Collection<Game>();
    }
}

产生了相同的迁移，我尝试了以下几种变体：

HasRequired(x => x.White)
    .HasMany(x => x.Games)
    .Map(t => t.ToTable("GamePlayer").MapKey("Game_Id", "Player_Id"));
HasRequired(x => x.Black)
    .HasMany(x => x.Games)
    .Map(t => t.ToTable("GamePlayer").MapKey("Game_Id", "Player_Id"));

在尝试生成迁移时抛出错误，抱怨游戏玩家不在模型中

---

如果您对我的错误有任何建议，我将不胜感激。

您不可能将EF配置为使用您的模型正确填充

Player.Games

集合。这就是为什么迁移看起来与您预期的不同。没有任何方法可以告诉EF“此集合包含以白色或黑色播放的游戏”

您需要更改模型，并且有几个选项：

取代单个

Player.Games

集合，添加两个集合

Player.gamesplayedasbblack

，

Player.GamesPlayedAsWhite

，并配置

Player

和

Game

实体之间的两个一对多关系

手动创建

GamePlayer

实体

public class Game {
    public int Id { get; set; }
    public virtual ICollection<GamePlayer> Players { get; set; }
}

public enum Color { White = 1, Black = 2}

public class GamePlayer {
    public int Id { get; set; }
    public virtual Game GamePlayed { get; set; }
    public Color PlayedAs { get; set; }
    public virtual Player Player { get; set; }
}

public class Player {
    public virtual ICollection<GamePlayer> Games { get; set; }
}

公共类游戏{
公共int Id{get；set；}
公共虚拟ICollection播放器{get；set；}
}
公共枚举颜色{白色=1，黑色=2}
公共级玩家{
公共int Id{get；set；}
公共虚拟游戏{get；set；}
公共颜色播放为{get；set；}
公共虚拟播放器{get；set；}
}
公开课选手{
公共虚拟ICollection游戏{get；set；}
}

---

谢谢你的回答和解释，最后我选择了选项2。

HasRequired(x => x.White)
    .HasMany(x => x.Games)
    .Map(t => t.ToTable("GamePlayer").MapKey("Game_Id", "Player_Id"));
HasRequired(x => x.Black)
    .HasMany(x => x.Games)
    .Map(t => t.ToTable("GamePlayer").MapKey("Game_Id", "Player_Id"));

public class Game {
    public int Id { get; set; }
    public virtual ICollection<GamePlayer> Players { get; set; }
}

public enum Color { White = 1, Black = 2}

public class GamePlayer {
    public int Id { get; set; }
    public virtual Game GamePlayed { get; set; }
    public Color PlayedAs { get; set; }
    public virtual Player Player { get; set; }
}

public class Player {
    public virtual ICollection<GamePlayer> Games { get; set; }
}