實體框架可選外鍵在從屬中創建冗余FK字段

Question

我正在嘗試使用此模型在User和TeamMember之間建立0-1關系

public class User
    {
        [Key]
        public Guid Id { get; set; }

        public Guid? TeamMemberId { get; set; }

        public virtual TeamMember TeamMember { get; set; }
    }

    public partial class TeamMember
    {


        [Key]
        [Column(Order = 0)]
        public Guid TeamId { get; set; }

        [Key]
        [Column(Order = 1)]
        public Guid UserId { get; set; }

        public virtual MSUCTeam Team { get; set; }

        public virtual User User { get; set; }

    }

    public class Team
    {
        [Key]
        public Guid Id { get; set; }

        public virtual ICollection<TeamMember> TeamMembers { get; set; }
    }

為了告訴EF有關關系的所有信息，我使用了如下的Fluent API

            modelBuilder.Entity<Team>()
            .HasMany(e => e.TeamMembers)
            .WithRequired(e => e.Team)
            .HasForeignKey(e => e.TeamId).WillCascadeOnDelete();

             modelBuilder.Entity<User>()
            .HasOptional(e => e.TeamMember)
            .WithRequired(e => e.User);

表本身是在上下文中定義的

        public virtual DbSet<Team> Teams { get; set; }

        public virtual DbSet<TeamMembers> TeamMembers { get; set; }

這將在數​​據庫中生成所需的表，但是TeamMembers表具有3列：

1）TeamId（Guid，不可為空）：PK和FK鏈接到Team.Id。 2）UserId（Guid，不可為空）：PK。 3）User_Id（Guid，不可為空）：FK鏈接到User.Id

如何使UserId列成為鏈接到User表的PK和FK？ 沒有UserId和TeamId都不會出現TeamMember條目，但是我必須告訴EF我想要它做什么。

Answer 1

我真的無法測試，但嘗試設置外鍵注釋

public partial class TeamMember
{
    [Key]
    [Column(Order = 0)]
    public Guid TeamId { get; set; }

    [Key]
    [Column(Order = 1)]
    public Guid UserId { get; set; }

    [ForeignKey("TeamId")]
    public virtual MSUCTeam Team { get; set; }

    [ForeignKey("UserId")]
    public virtual User User { get; set; }

}

Answer 2

用這個：

public class User
{
    [Key]
    public Guid Id { get; set; }

    public virtual TeamMember TeamMember { get; set; }
}

public partial class TeamMember
{
    [Key, ForeignKey("User")]
    public Guid Id{ get; set; }

    public virtual User User { get; set; }
}

protected override void OnModelCreating(DbModelBuilder modelBuilder)  
{  
    modelBuilder.Entity<TeamMember>()
                .HasRequired(p => p.User)
                .WithOptional(p => p.TeamMember);
} 

有關拆分表的更多信息，請單擊此鏈接 ；