Question

我正在使用实体框架和代码优先方法

但是我收到了一些错误：

用户：FromRole：NavigationProperty“用户”无效。在AssociationType'User_SoteAccounts'中输入FromRole'User_SoteAccounts_Target'的'SoteAccount'必须与声明此NavigationProperty的类型'AllegroAccount'完全匹配。
  AllegroAccount_Template_Source :: Multiplicity在关系'AllegroAccount_Template'中的角色'AllegroAccount_Template_Source'中无效。由于“从属角色”属性不是关键属性，因此从属角色的多重性的上限必须为“”。
  SoteAccount_Template_Source ::多重性在关系'SoteAccount_Template'中的角色'SoteAccount_Template_Source'中无效。由于Dependent Role属性不是关键属性，因此Dependent Role的多重性的上限必须为“”。

甚至可以继承带引用的类吗？

以下是类和onModelCreating

[Table("AllegroAccounts")]
public class AllegroAccount : ShopAccountBase
{
    public string AllegroLogin { get; set; }
    public string AllegroPassword { get; set; }
    public string AllegoWebApiKey { get; set; }
    public int CountryCode { get; set; }      
}

public class ShopAccountBase : AccountBase
{
    public int TemplateForeignKey { get; set; }
    [ForeignKey("TemplateForeignKey")]
    public Template Template { get; set; }
}

public abstract class AccountBase
{
    [Key]
    public int AccountBaseId { get; set; }
    public bool IsActive { get; set; }
    public int UserForeignKey { get; set; }
    [ForeignKey("UserForeignKey")]
    public virtual User User { get; set; }
    public bool DaysCountActive { get; set; }
    public int DaysCount { get; set; }
}

public class Template 
{
    public Template()
    {
        AdditionalServices = new AdditionalServices();
        BasicServices = new BasicServices();
        TemplatePackages = new ObservableCollection<TemplatePackage>();
    }

    [Key]
    public int TemplateID { get; set; }

    public string TemplateName { get; set; }
    public TemplateKind? TemplateKind { get; set; }
    public CourierFirm? CourierFirm { get; set; }
    public int Used { get; set; }
    public virtual ICollection<TemplatePackage> TemplatePackages { get; set; }
    public string ExternalNumber { get; set; }
    public string MPKNumber { get; set; }
    public AdditionalServices AdditionalServices { get; set; }
    public BasicServices BasicServices { get; set; }
    public string Description { get; set; }
    [Column(TypeName = "datetime")]
    public DateTime? CreationDate { get; set; }
}

public class User 
{
    public User() 
    {
        DefaultReturnAddress = new Address( );
        DefaultSendingAddress = new Address( );
        PersonInfoSending = new PersonInfo( );
        PersonInfoReturning = new PersonInfo( );
        AdditionalServices = new AdditionalServices( );

        WayBillLabel = new WaybillLabel( );
        Settings = new UserSettings( );
        AllegroAccounts = new ObservableCollection<AllegroAccount>();
        InpostAccounts = new ObservableCollection<InpostAccount>();
        TbaAccounts = new ObservableCollection<TbaAccount>();
        TruckerAccounts = new ObservableCollection<TruckerAccount>();
    }

    [Key]
    public int UserId { get; set; }

    public byte[] Password { get; set; }
    public string Login { get; set; }

    public Address DefaultReturnAddress { get; set; }
    public Address DefaultSendingAddress { get; set; }

    public PersonInfo PersonInfoSending { get; set; }
    public PersonInfo PersonInfoReturning { get; set; }

    public string MPKnumReturn { get; set; }
    public string MPKnumSending { get; set; }

    public AdditionalServices AdditionalServices { get; set; }

    public float MaxLength { get; set; }
    public float MaxWidth { get; set; }
    public float MaxHeight { get; set; }
    public float MaxWeight { get; set; }

    public int FileTemplateId { get; set; }
    public string CollectiveShipmentFilePath { get; set; }

    private PermissionFlags _permissions;

    public PermissionFlags Permissions
    {
        get { return _permissions; }
        set
        {
            if (_permissions.HasFlag(value)) { _permissions &= ~value; }
            else {
                _permissions |= value;
            }
        }
    }

    public TemplatingMethod TemplatingMethod { get; set; }

    public UserSettings Settings { get; set; }

    public WaybillLabel WayBillLabel { get; }

    public ICollection<AllegroAccount> AllegroAccounts { get; set; }
    public ICollection<SoteAccount> SoteAccounts { get; set; }

    public ICollection<InpostAccount> InpostAccounts { get; set; }
    public ICollection<TruckerAccount> TruckerAccounts { get; set; }
    public ICollection<TbaAccount> TbaAccounts { get; set; }

    // this is the right property to use for modifying the collection
    public ICollection<string> AvailableMpksCollection { get; set; }

    // this is computed property for Entity Framework only, because it cannot store a collection of primitive type
    public string AvailableMpksString
    {
        get { return AvailableMpksCollection != null ? string.Join(",", AvailableMpksCollection) : null; }
        set {
            AvailableMpksCollection = !string.IsNullOrEmpty(value) ? value.Split(',').ToList( ) : new List<string>( );
        }
    }
}


modelBuilder.Entity<AllegroAccount>().HasOptional(account => account.Template).WithOptionalDependent();

modelBuilder.Entity<User>()
            .HasMany<AllegroAccount>(u => u.AllegroAccounts)
            .WithOptional(acc => acc.User)
            .HasForeignKey(acc => acc.UserForeignKey);

modelBuilder.Entity<SoteAccount>().HasOptional(account => account.Template).WithOptionalDependent();

modelBuilder.Entity<User>()
            .HasMany<SoteAccount>(u => u.SoteAccounts)
            .WithOptional(acc => acc.User)
            .HasForeignKey(acc => acc.UserForeignKey);

有没有人知道这是否可能，或者我应该保持不变并且不继续这样做？我问，因为继承会很好地适应我的通用存储库模型

Answer 1

这可能是因为您正在定义[ForeignKey]属性并在流畅配置中配置外键。

当您的AccountBase已使用[ForeignKey]定义时，您已在流畅配置中定义了（AllegroAccount和用户）和（SoteAccount和用户）之间的链接。

同样的事情很可能适用于您的模板链接 - 关系是ShopAccountBase级别由[ForeignKey]级别定义的 - 您不需要为继承的类重新定义它在流畅的配置。

尝试删除所有modelBuilder流畅的配置条目 - 它仍然可以继承关系。

具有导航属性的实体框架继承

1 个答案: