Question

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);
     }
 }

我在类型为初始时遇到此错误。

指定的架构无效。错误：（151,6）：错误0040：键入 Person_Father未在名称空间ExamModel（Alias = Self）中定义。

有没有办法通过两个属性（motherId和fatherId）映射Childs属性？

Answer 1

无法将两个导航属性映射到单个集合属性。它看起来很荒谬，但你必须有两个集合属性

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

谢谢你，Eranga，你的回复正是我所需要的！

此外，如果有人使用该方法而不是Eranga使用的配置方法，这里是modelBuilder代码。

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);
}

实体框架代码优先 - 将两个字段联合成一个集合

2 个答案: