如何在EF中的同一個class（表）中添加兩個外鍵

Question

我正在使用 EF 項目，我嘗試添加兩個外鍵，但是在添加遷移時遇到了問題。

public class Person
{
    public int Id { get; set; }
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public DateTime BirthDate { get; set; }
    public DateTime? DeathDate { get; set; }

    public int? FatherId { get; set; }
    public int? MotherId { get; set; }

    [ForeignKey("FatherId")]
    public virtual Person Father { get; set; }

    [ForeignKey("MotherId")]
    public virtual Person Mother { get; set; }
}

Answer 1

在您的上下文中添加此代碼

   protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
    modelBuilder.Entity<Person>()
        .HasOptional(a => a.Mother)
        .WithMany()
        .HasForeignKey(a => a.MotherId);

    modelBuilder.Entity<Person>()
        .HasOptional(a => a.Father)
        .WithMany()
        .HasForeignKey(a => a.FatherId);
}

        ```