ASP MVC5中的多级一对多

Question

我正在开展一个小项目，我有多层次的一对多模型。但由于某种原因，EF似乎不理解这种关系，当我用EF创建MVC控制器时收到错误。

以下是我的模型类：

public class BusinessDomain
{
    [Key]
    public int BusinessDomainID { get; set; }
    [Display(Name = "Business Domain Name")]
    public string DomainName { get; set; }
    [Display(Name = "Domain Manager Name")]
    public string DomainManager { get; set; }

    public virtual ICollection<BusinessProcess> BusinessProcesses { get; set; }

}

 public class BusinessProcess
{ 
    public int BusinessProcessID { get; set; }
    [Display(Name = "Business Processs Name")]
    public string ProcessName { get; set; }
    [Display(Name = "Business Process Owner Name")]
    public string ProcessOwner { get; set; }

    public virtual ICollection<BusinessSubProcess> BusinessSubProcesses { get; set; }

    public int BusinessDomainID { get; set; }
    public virtual BusinessDomain BusinessDomain { get; set; }
}



 public class BusinessSubProcess
{
    public int BusinessSubProcessId { get; set; }
    public string SubProcessName { get; set; }
    public string SubProcessOwnerName { get; set; }

    public int BusinessProcessID { get; set; }
    public virtual BusinessProcess BusinessProcess { get; set; }
}

当我创建EF控制器时，我得到以下错误：依赖角色是指关键属性，Dependent角色的多重性的上限必须为1.

如果我只保留两个模型（BusinessLine和BusinessProcess），它似乎可行。我开始怀疑ASP MVC是否不支持一对多模型的多级？

请告诉我，我做错了什么？

提前致谢！

Answer 1

我看到的唯一区别是您没有在BusinessProcess类中包含对BusinessLine对象的引用。您应该包括它并将其标记为外键。

此外，您将BusinessSubprocessID标记为BusinessProcess的外键，我认为这是一个错误，因为您还在类中持有BusinessProcessID。

作为旁注，您是否需要Subprocess类中的BusinessLineID，因为您可以通过其父级轻松访问它？

   public class BusinessLine
{
    [Key]
    public int BusinessLineID { get; set; }
    [Display(Name = "Business Domain Name")]
    public string DomainName { get; set; }
    [Display(Name = "Domain Manager Name")]
    public string DomainManager { get; set; }

    public virtual ICollection<BusinessProcess> BusinessProcesses { get; set; }

}

   public class BusinessProcess
{ 
    [Key]
    public int BusinessProcessID { get; set; }
    [Display(Name = "Business Processs Name")]
    public string ProcessName { get; set; }
    [Display(Name = "Business Process Owner Name")]
    public string ProcessOwner { get; set; }


    public virtual ICollection<BusinessSubProcess> BusinessSubProcesses { get; set; }

    public int BusinessLineID { get; set; }
    [ForeignKey("BusinessLineID")]
    public virtual BusinessLine BusinessLine { get; set; }
}

    public class BusinessSubProcess
{
    [Key]
    public int BusinessSubProcessId { get; set; }
    public string SubProcessName { get; set; }
    public string SubProcessOwnerName { get; set; }
    public DateTime Created { get; set; }
    public DateTime LastChange { get; set; }

    public int BusinessProcessID { get; set; }
    [ForeignKey("BusinessProcessID")]
    public virtual BusinessProcess BusinessProcess { get; set; }
}