实体框架代码第一 - 联盟两个字段成一个集合

问题描述

我有这个型号和配置

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);
     }
 }

和我得到这个错误的类型为初始。指定

and i get this error where the type is initial.

模式是无效的。错误：（151,6）：错误0040：。键入
Person_Father没有命名空间ExamModel（别名=自）定义的

有没有一种方法来映射由两个属性（motherId和fatherId）童车属性？

Is there a way to map Childs property by both properties (motherId and fatherId)?

推荐答案

它无法将两个导航属性映射到一个单一的集合属性。它看起来太荒唐了，但你必须有两个集合属性。

Its not possible to map two navigational properties to a single collection property. It looks ridicules but you have to have two collection properties

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);
     }
 }

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