Question

我试图使用相同的类型获得一对多的关系。

e.g。

public class CompanionLinkedCompanion
{
    public int CompanionId { get; set; }

    [ForeignKey("CompanionId")]
    public virtual Companion Companion { get; set; }

    public int LinkedCompanionId { get; set; }

    [ForeignKey("LinkedCompanionId")]
    public virtual Companion LinkedCompanion { get; set; }
}

然后

public class Companion
{
    public virtual ICollection<CompanionLinkedCompanion> CompanionLinkedCompanions { get; set; }
}

当我尝试此功能时，链接随播广告的随播广告系列不会被填充。

感谢任何帮助。

使用@iraj part-solution修复更新：

public class CompanionLinkedCompanion : Entity
{
    public int Id { get; set; }

    public int CompanionId { get; set; }

    [ForeignKey("CompanionId")]
    [InverseProperty("CompanionLinkedCompanions")]
    public virtual Companion Companion { get; set; }

    public int LinkedCompanionId { get; set; }

    [ForeignKey("LinkedCompanionId")]
    public virtual Companion LinkedCompanion { get; set; }
}

Answer 1

使用它：

 public class CompanionLinkedCompanion
{
 public int CompanionId { get; set; }

 [ForeignKey("CompanionId")]
 [InverseProperty("CompanionLinkedCompanions")]
 public virtual Companion Companion { get; set; }

 public int LinkedCompanionId { get; set; }

 [ForeignKey("LinkedCompanionId")]
 [InverseProperty("LinkedCompanions")]
 public virtual Companion LinkedCompanion { get; set; }
}


public class Companion
{
  [InverseProperty("Companion")]
  public virtual ICollection<CompanionLinkedCompanion> CompanionLinkedCompanions { get; set; }

  [InverseProperty("LinkedCompanion")]
  public virtual ICollection<CompanionLinkedCompanion> LinkedCompanions { get; set; }
}

 protected override void OnModelCreating(DbModelBuilder modelBuilder)
 {
       modelBuilder.Entity<CompanionLinkedCompanion>().HasRequired(x => x.Companion).WithMany().HasForeignKey(x => x.CompanionId).willCascadeOnDelete(false);

      modelBuilder.Entity<CompanionLinkedCompanion>().HasRequired(x => x.LinkedCompanion).WithMany().HasForeignKey(x => x.LinkedCompanionId);
  }

Answer 2

对于一对多关系，您需要标准的父/子关系（只需要一个实体类）：

public class Companion
{
    public int CompanionId { get; set; }

    public int? LinkedCompanionId { get; set; }

    [ForeignKey("LinkedCompanionId")]
    // ParentCompanion
    public virtual Companion LinkedCompanion { get; set; }

    [InverseProperty("LinkedCompanion")]
    // ChildrenCompanions
    public virtual ICollection<Companion> CompanionLinkedCompanions { get; set; }
}

实体框架一对多关系相同类型

2 个答案: