C# 外键依赖于另一个外键，因为它'；s父密钥

我正在创建一个库，作为其他项目的基础，可以找到项目的详细信息，也可以找到nuget包

因为这是一个基本库，我想允许用户扩展模型，所以我创建的是接口，而不是具体的库（默认实现显然存在，但这超出了当前问题的范围），但由于实体框架只能用具体的类来完成导航/外键，我正在经历通用接口的过程，它工作得很好，但是我已经达到了一个点，我想基于同一个表中的另一个外键来限制外键

在寻找答案时，这个问题最接近我的要求

这里提供的解决方案说，从技术上讲，您应该删除父表键，因为子表已经有了可以用来关联到父表的父表键，我完全同意这一点，然而，在我的例子中，这是不可能的，因为它将导致循环依赖地狱，这是应该不惜一切代价远离软件项目的东西

i组织界面

public interface IOrganization<TLinkedAddress> where TLinkedAddress : ILinkedAddress
{
    long ID { get; set; }
    string Name { get; set; }
    string Brand { get; set; }
    string Genre { get; set; }
    string Industry { get; set; }
    string Master_Security_Stamp { get; set; }
    long? Control_Branch_ID { get; set; }

    [ForeignKey("Control_Branch_ID")]
    TLinkedAddress Control_Branch { get; set; }

    IList<TLinkedAddress> Branches { get; set; }
}

public interface ILinkedAddress
{
    long ID { get; set; }
    string Address { get; set; }
    long LocationID { get; set; }
    string AddressType { get; set; }
    string Contact_Person_Name { get; set; }
    string Contact_Person_Number { get; set; }
    string Contact_Person_Relation { get; set; }
    [ForeignKey("OrganizationID")]
    long? OrganizationID { get; set; }
    [ForeignKey("UserID")]
    long? UserID { get; set; }
}

public interface IEducation<TUser, TOrganization, TLinkedAddress>
    where TUser : IUser
    where TOrganization : IOrganization<TLinkedAddress>
    where TLinkedAddress : ILinkedAddress
{
    long ID { get; set; }
    long UserID { get; set; }
    long InstituteID { get; set; }
    long InstituteLocationID { get; set; }
    string Degree { get; set; }
    string Major { get; set; }
    string Grade { get; set; }
    DateTime StartDate { get; set; }
    DateTime? EndDate { get; set; }
    string Socities { get; set; }
    string Description { get; set; }

    [ForeignKey(name: "UserID")]
    TUser User { get; set; }
    [ForeignKey(name: "InstituteID")]
    TOrganization Institute { get; set; }
    [ForeignKey(name: "InstituteLocationID")]
    TLinkedAddress InstituteLocation { get; set; }
}

i教育界面

public interface IOrganization<TLinkedAddress> where TLinkedAddress : ILinkedAddress
{
    long ID { get; set; }
    string Name { get; set; }
    string Brand { get; set; }
    string Genre { get; set; }
    string Industry { get; set; }
    string Master_Security_Stamp { get; set; }
    long? Control_Branch_ID { get; set; }

    [ForeignKey("Control_Branch_ID")]
    TLinkedAddress Control_Branch { get; set; }

    IList<TLinkedAddress> Branches { get; set; }
}

public interface ILinkedAddress
{
    long ID { get; set; }
    string Address { get; set; }
    long LocationID { get; set; }
    string AddressType { get; set; }
    string Contact_Person_Name { get; set; }
    string Contact_Person_Number { get; set; }
    string Contact_Person_Relation { get; set; }
    [ForeignKey("OrganizationID")]
    long? OrganizationID { get; set; }
    [ForeignKey("UserID")]
    long? UserID { get; set; }
}

public interface IEducation<TUser, TOrganization, TLinkedAddress>
    where TUser : IUser
    where TOrganization : IOrganization<TLinkedAddress>
    where TLinkedAddress : ILinkedAddress
{
    long ID { get; set; }
    long UserID { get; set; }
    long InstituteID { get; set; }
    long InstituteLocationID { get; set; }
    string Degree { get; set; }
    string Major { get; set; }
    string Grade { get; set; }
    DateTime StartDate { get; set; }
    DateTime? EndDate { get; set; }
    string Socities { get; set; }
    string Description { get; set; }

    [ForeignKey(name: "UserID")]
    TUser User { get; set; }
    [ForeignKey(name: "InstituteID")]
    TOrganization Institute { get; set; }
    [ForeignKey(name: "InstituteLocationID")]
    TLinkedAddress InstituteLocation { get; set; }
}

公共接口教育
图瑟：尤瑟
组织所在地：I组织
地址：ILinkedAddress:ILinkedAddress
{
长ID{get；set；}
长用户标识{get；set；}
长机构ID{get；set；}
long InstituteLocationID{get；set；}
字符串度{get；set；}
字符串主键{get；set；}
字符串级别{get；set；}
DateTime开始日期{get；set；}
DateTime？EndDate{get；set；}
字符串社团{get；set；}
字符串说明{get；set；}
[外键（名称：“UserID”）]
TUser用户{get；set；}
[ForeignKey（名称：“InstituteID”）]
组织研究所{get；set；}
[ForeignKey（名称：“InstituteLocationID”）]
TLinkedAddress机构位置{get；set；}
}

默认实现

[Table(name: "LinkedAddress", Schema = "Arinsys_CRM")]
public class LinkedAddress : DBEntity<LinkedAddress>, ILinkedAddress
{
    public long ID { get; set; }
    public string Address { get; set; }
    public long LocationID { get; set; }
    public string AddressType { get; set; }
    public string Contact_Person_Name { get; set; }
    public string Contact_Person_Number { get; set; }
    public string Contact_Person_Relation { get; set; }
    [ForeignKey("OrganizationID")]
    public long? OrganizationID { get; set; }
    [ForeignKey("UserID")]
    public long? UserID { get; set; }
}

[Table(name: "Organization", Schema = "Arinsys_CRM")]
public partial class Organization : DataContext.DBEntity<Organization>,
    IOrganization<LinkedAddress>
{
    public long ID { get; set; }
    public string Name { get; set; }
    public string Brand { get; set; }
    public string Genre { get; set; }
    public string Industry { get; set; }
    public string Master_Security_Stamp { get; set; }
    public long? Control_Branch_ID { get; set; }

    [ForeignKey("Control_Branch_ID")]
    public virtual LinkedAddress Control_Branch { get; set; }

    public virtual IList<LinkedAddress> Branches { get; set; }
}

[Table(name: "Education", Schema = "Arinsys_CRM")]
public class Education : IEducation<User, Organization, LinkedAddress>
{
    public long ID { get; set; }
    public long UserID { get; set; }
    public long InstituteID { get; set; }
    public long InstituteLocationID { get; set; }
    public string Degree { get; set; }
    public string Major { get; set; }
    public string Grade { get; set; }
    public DateTime StartDate { get; set; }
    public DateTime? EndDate { get; set; }
    public string Socities { get; set; }
    public string Description { get; set; }

    [ForeignKey(name: "UserID")]
    public virtual User User { get; set; }
    [ForeignKey(name: "InstituteID")]
    public virtual Organization Institute { get; set; }
    [ForeignKey(name: "InstituteLocationID")]
    public virtual LinkedAddress InstituteLocation { get; set; }
}

LinkedAddress.cs

[Table(name: "LinkedAddress", Schema = "Arinsys_CRM")]
public class LinkedAddress : DBEntity<LinkedAddress>, ILinkedAddress
{
    public long ID { get; set; }
    public string Address { get; set; }
    public long LocationID { get; set; }
    public string AddressType { get; set; }
    public string Contact_Person_Name { get; set; }
    public string Contact_Person_Number { get; set; }
    public string Contact_Person_Relation { get; set; }
    [ForeignKey("OrganizationID")]
    public long? OrganizationID { get; set; }
    [ForeignKey("UserID")]
    public long? UserID { get; set; }
}

[Table(name: "Organization", Schema = "Arinsys_CRM")]
public partial class Organization : DataContext.DBEntity<Organization>,
    IOrganization<LinkedAddress>
{
    public long ID { get; set; }
    public string Name { get; set; }
    public string Brand { get; set; }
    public string Genre { get; set; }
    public string Industry { get; set; }
    public string Master_Security_Stamp { get; set; }
    public long? Control_Branch_ID { get; set; }

    [ForeignKey("Control_Branch_ID")]
    public virtual LinkedAddress Control_Branch { get; set; }

    public virtual IList<LinkedAddress> Branches { get; set; }
}

[Table(name: "Education", Schema = "Arinsys_CRM")]
public class Education : IEducation<User, Organization, LinkedAddress>
{
    public long ID { get; set; }
    public long UserID { get; set; }
    public long InstituteID { get; set; }
    public long InstituteLocationID { get; set; }
    public string Degree { get; set; }
    public string Major { get; set; }
    public string Grade { get; set; }
    public DateTime StartDate { get; set; }
    public DateTime? EndDate { get; set; }
    public string Socities { get; set; }
    public string Description { get; set; }

    [ForeignKey(name: "UserID")]
    public virtual User User { get; set; }
    [ForeignKey(name: "InstituteID")]
    public virtual Organization Institute { get; set; }
    [ForeignKey(name: "InstituteLocationID")]
    public virtual LinkedAddress InstituteLocation { get; set; }
}

[表（名称：“LinkedAddress”，Schema=“Arinsys\u CRM”）]
公共类LinkedAddress:DBEntity，ILinkedAddress
{
公共长ID{get；set；}
公共字符串地址{get；set；}
公共长位置ID{get；set；}
公共字符串地址类型{get；set；}
公共字符串Contact_Person_Name{get；set；}
公共字符串Contact_Person_Number{get；set；}
公共字符串联系人\个人\关系{get；set；}
[外键（“组织ID”）]
公共长？组织ID{get；set；}
[外键（“用户ID”）]
public long？UserID{get；set；}
}

Organization.cs

[Table(name: "LinkedAddress", Schema = "Arinsys_CRM")]
public class LinkedAddress : DBEntity<LinkedAddress>, ILinkedAddress
{
    public long ID { get; set; }
    public string Address { get; set; }
    public long LocationID { get; set; }
    public string AddressType { get; set; }
    public string Contact_Person_Name { get; set; }
    public string Contact_Person_Number { get; set; }
    public string Contact_Person_Relation { get; set; }
    [ForeignKey("OrganizationID")]
    public long? OrganizationID { get; set; }
    [ForeignKey("UserID")]
    public long? UserID { get; set; }
}

[Table(name: "Organization", Schema = "Arinsys_CRM")]
public partial class Organization : DataContext.DBEntity<Organization>,
    IOrganization<LinkedAddress>
{
    public long ID { get; set; }
    public string Name { get; set; }
    public string Brand { get; set; }
    public string Genre { get; set; }
    public string Industry { get; set; }
    public string Master_Security_Stamp { get; set; }
    public long? Control_Branch_ID { get; set; }

    [ForeignKey("Control_Branch_ID")]
    public virtual LinkedAddress Control_Branch { get; set; }

    public virtual IList<LinkedAddress> Branches { get; set; }
}

[Table(name: "Education", Schema = "Arinsys_CRM")]
public class Education : IEducation<User, Organization, LinkedAddress>
{
    public long ID { get; set; }
    public long UserID { get; set; }
    public long InstituteID { get; set; }
    public long InstituteLocationID { get; set; }
    public string Degree { get; set; }
    public string Major { get; set; }
    public string Grade { get; set; }
    public DateTime StartDate { get; set; }
    public DateTime? EndDate { get; set; }
    public string Socities { get; set; }
    public string Description { get; set; }

    [ForeignKey(name: "UserID")]
    public virtual User User { get; set; }
    [ForeignKey(name: "InstituteID")]
    public virtual Organization Institute { get; set; }
    [ForeignKey(name: "InstituteLocationID")]
    public virtual LinkedAddress InstituteLocation { get; set; }
}

[表（名称：“组织”，Schema=“Arinsys\u CRM”）]
公共部分类组织：DataContext.DBEntity，
组织
{
公共长ID{get；set；}
公共字符串名称{get；set；}
公共字符串品牌{get；set；}
公共字符串类型{get；set；}
公共字符串行业{get；set；}
公共字符串Master_Security_Stamp{get；set；}
公共长？控制分支ID{get；set；}
[ForeignKey（“控制分支机构ID”）]
公共虚拟链接地址控件_分支{get；set；}
公共虚拟IList分支{get；set；}
}

Education.cs

[Table(name: "LinkedAddress", Schema = "Arinsys_CRM")]
public class LinkedAddress : DBEntity<LinkedAddress>, ILinkedAddress
{
    public long ID { get; set; }
    public string Address { get; set; }
    public long LocationID { get; set; }
    public string AddressType { get; set; }
    public string Contact_Person_Name { get; set; }
    public string Contact_Person_Number { get; set; }
    public string Contact_Person_Relation { get; set; }
    [ForeignKey("OrganizationID")]
    public long? OrganizationID { get; set; }
    [ForeignKey("UserID")]
    public long? UserID { get; set; }
}

[Table(name: "Organization", Schema = "Arinsys_CRM")]
public partial class Organization : DataContext.DBEntity<Organization>,
    IOrganization<LinkedAddress>
{
    public long ID { get; set; }
    public string Name { get; set; }
    public string Brand { get; set; }
    public string Genre { get; set; }
    public string Industry { get; set; }
    public string Master_Security_Stamp { get; set; }
    public long? Control_Branch_ID { get; set; }

    [ForeignKey("Control_Branch_ID")]
    public virtual LinkedAddress Control_Branch { get; set; }

    public virtual IList<LinkedAddress> Branches { get; set; }
}

[Table(name: "Education", Schema = "Arinsys_CRM")]
public class Education : IEducation<User, Organization, LinkedAddress>
{
    public long ID { get; set; }
    public long UserID { get; set; }
    public long InstituteID { get; set; }
    public long InstituteLocationID { get; set; }
    public string Degree { get; set; }
    public string Major { get; set; }
    public string Grade { get; set; }
    public DateTime StartDate { get; set; }
    public DateTime? EndDate { get; set; }
    public string Socities { get; set; }
    public string Description { get; set; }

    [ForeignKey(name: "UserID")]
    public virtual User User { get; set; }
    [ForeignKey(name: "InstituteID")]
    public virtual Organization Institute { get; set; }
    [ForeignKey(name: "InstituteLocationID")]
    public virtual LinkedAddress InstituteLocation { get; set; }
}

[表（名称：“教育”，Schema=“Arinsys\u CRM”）]
公营教育：教育
{
公共长ID{get；set；}
公共长用户标识{get；set；}
公共长机构ID{get；set；}
公共长期机构定位ID{get；set；}
公共字符串度数{get；set；}
公共字符串主键{get；set；}
公共字符串等级{get；set；}
公共日期时间起始日期{get；set；}
公共日期时间？结束日期{get；set；}
公共字符串社团{get；set；}
公共字符串说明{get；set；}
[外键（名称：“UserID”）]
公共虚拟用户用户{get；set；}
[ForeignKey（名称：“InstituteID”）]
公共虚拟组织机构{get；set；}
[ForeignKey（名称：“InstituteLocationID”）]
公共虚拟链接地址机构位置{get；set；}
}

现在的问题是，在

IEducation

接口中，是否有可能对

instituteLocationID

施加约束，即它必须是

组织的一个分支，由
InstituteID
定义，否则我将别无选择，只能让最终开发人员自己施加约束

编辑：进一步研究

我开始研究@Ivan Starostin建议的可传递依赖关系，并偶然发现@Jeff Atwood（Stack Overflow的联合创始人（荣誉退休人员）和联合创始人）关于他们在2008年面临的堆栈溢出问题的这篇很棒的博文


这篇博文的总结是，规范化并不是万能的，有时非规范化的数据实际上会带来更好的生产力和性能，尽管这篇博文没有回答确切的问题，但它帮助我获得了更深入的理解，所以在这里为未来的读者发帖。
这是一个有点理论性的问题。InstituteID不是教育实体的属性，而是LinkedLocation实体的属性。所以你在教育实体中有一个传递依赖，这意味着它不是第三范式：InstituteID依赖于InstituteLocationID。因此，您必须将InstituteID视为无关系约束的非规范化数据，或者将其从教育实体中删除。此外，我认为问题来自LinkedAddress实体-它是地址实体和附加链接实体的混合体，应该存储地址和组织之间的链接。所以，如果您从LinkedAddress提取实体地址，并使LinkedAddress成为一个真正的链接实体，它存储AddressID和OrganizationID的元组，这可能会使模型更加清晰，并显示InstituteLocation