Question

我有像这样的域名模型

public class ShipToCode
    {

        public int ShipToCodeID { get; set; }

        [Required(ErrorMessage = "Nombre es requerido",AllowEmptyStrings = false)]
        [StringLength(50, ErrorMessage = "Debe ser menor a 50 carácteres")]
        [MaxLength(50)]
        [Column("nb_name")]
        public string Name { get; set; }

        [StringLength(15, ErrorMessage = "Debe ser menor a 15 carácteres")]
        [MaxLength(15)]
        [Column("cd_locId")]
        public string locId { get; set; }

        public int? RegionID { get; set; }
        public virtual Region Region { get; set; }


        [Required(ErrorMessage = "Dealer es requerido")]
        public int DealerID { get; set; }
        public virtual Dealer Dealer { get; set; }
    }
public class Dealer
    {

        public Dealer()

        {

            this.ShipToCode = new HashSet<ShipToCode>();
        }

        public int DealerID { get; set; }

        [Required(ErrorMessage = "Nombre es requerido")]
        [StringLength(100, ErrorMessage = "Debe ser menor a 100 carácteres")]
        [MaxLength(100)]
        [Column("nb_name")]
        public string Name { get; set; }

        [Required(ErrorMessage = "Codigo de distribuidor es requerido")]
        [StringLength(100, ErrorMessage = "Debe ser menor a 100 carácteres")]
        [MaxLength(100)]
        [Column("cd_dealerCode")]
        public string DealerCode { get; set; }

        public virtual ICollection<ShipToCode> ShipToCode { get; private set; }


    }

在我的背景下

protected override void OnModelCreating(DbModelBuilder modelBuilder)
        {

            modelBuilder.Entity<ShipToCode>()
               .HasRequired<Dealer>(d => d.Dealer)
               .WithMany(d => d.ShipToCode)
               .HasForeignKey<int>(c => c.DealerID);

        }

但是当我得到任何ShipToCode或经销商时，使用DbSet的find功能，我在ShipToCode中的经销商对象或经销商的ShipToCode的ICollection是空的

这是正常的还是我错过了什么？请帮助!!

Answer 1

在您的经销商处，物业，
public virtual ICollection<ShipToCode> ShipToCode { get; private set; }
您需要使用private set方法将其公开，否则EF无法从数据库中设置它。并确保您已在context中启用了延迟加载功能。如果你没有启用延迟加载，你可以使用这样的热切加载，

Context.ShipToCodes.Include(s=>s.Dealer ).where(s=>s.ShipToCodeID ==1)

EF CF：它是对的永远是FK的对象吗？

1 个答案: