具有多对多关系的导航属性

Question

通过一对多关系，我可以在创建新实体时使用导航属性。

public class Team
{
    [Key]
    public Guid Guid { get; set; }
    public List<Player>? Players { get; set; } = null!;
}

public class Player
{
    [Key]
    public Guid Guid { get; set; }
    public Guid TeamGuid { get; set; }
    [ForeignKey(nameof(TeamGuid))]
    public Team? Team { get; set; } = null!;
}

这很好，因为我只需指定

Player

键即可将

Team

添加到

Team

。但是，我无法将这种方法扩展到多对多关系。例如，我尝试过这个：

public class Team
{
    [Key]
    public Guid Guid { get; set; }
    public List<Guid>? PlayerGuids { get; set; } = null!;
    [ForeignKey(nameof(PlayerGuids))]
    public List<Player>? Players { get; set; } = null!;
}

public class Player
{
    [Key]
    public Guid Guid { get; set; }
    public List<Guid>? TeamGuids { get; set; } = null!;
    [ForeignKey(nameof(TeamGuids))]
    public List<Team>? Teams { get; set; } = null!;
}

EF Core 似乎只是忽略了我的导航属性。

Answer 1

有了

EF-Core 6+

，就很简单了，就像这样：

public class Team
{
    public Guid Id { get; set; }

    public List<Player>? Players { get; set; } = null!;
}

public class Player
{
    public Guid Id { get; set; }

    public List<Team>? Teams { get; set; } = null!;
}