實體框架代碼優先 - 將兩個字段聯合成一個集合

Question

我有這個型號和配置

public class Person
 {
     public int? FatherId { get; set; }
     public virtual Person Father { get; set; }
     public int? MotherId { get; set; }
     public virtual Person Mother { get; set; }
     public virtual List<Person> Childs { get; set; }

 }
 class PersonConfiguration : EntityTypeConfiguration<Person>
 {
     public PersonConfiguration()
     {
         HasOptional(e => e.Father).WithMany(e => e.Childs)
              .HasForeignKey(e => e.FatherId);
         HasOptional(e => e.Mother).WithMany(e => e.Childs)
              .HasForeignKey(e => e.MotherId);
     }
 }

我得到這個類型是初始的錯誤。

指定的架構無效。 錯誤：（151,6）：錯誤0040：在名稱空間ExamModel（Alias = Self）中未定義類型Person_Father。

有沒有辦法通過兩個屬性（motherId和fatherId）映射Childs屬性？

Answer 1

無法將兩個導航屬性映射到單個集合屬性。 它看起來很嘲笑，但你必須有兩個集合屬性

public class Person
 {
     public int? FatherId { get; set; }
     public virtual Person Father { get; set; }
     public int? MotherId { get; set; }
     public virtual Person Mother { get; set; }
     public virtual List<Person> ChildrenAsFather { get; set; }
     public virtual List<Person> ChildrenAsMother { get; set; }
 }

 class PersonConfiguration : EntityTypeConfiguration<Person>
 {
     public PersonConfiguration()
     {
         HasOptional(e => e.Father).WithMany(e => e.ChildrenAsFather)
              .HasForeignKey(e => e.FatherId);
         HasOptional(e => e.Mother).WithMany(e => e.ChildrenAsMother)
              .HasForeignKey(e => e.MotherId);
     }
 }

Answer 2

謝謝你，Eranga，你的回復正是我所需要的！

另外，如果有人使用該方法而不是Eranga使用的配置方法，這里是modelBuilder代碼。

protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
    modelBuilder.Entity<Person>().
    HasKey(i => i.PersonId);

    modelBuilder.Entity<Person>().
    HasOptional(f => f.Father).
    WithMany(f => f.ChildrenAsFather).
    HasForeignKey(f => f.FatherId);

    modelBuilder.Entity<Person>().
    HasOptional(m => m.Mother).
    WithMany(m => m.ChildrenAsMother).
    HasForeignKey(m => m.MotherId);
}