entity-framework - 不允许多重。 Entity Framework

Question

我第一次尝试使用 MVC4 并且在尝试创建 Controller 时收到以下错误？有人可以引导我朝着正确的方向前进吗？

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System.Data.Entity.Edm.EdmAssociationEnd: : Multiplicity is not valid in Role 'PropertyData_DNISData_Target' in relationship 'PropertyData_DNISData'. Because the Dependent Role properties are not the key properties, the upper bound of the multiplicity of the Dependent Role must be '*'.

public class PropertyData
{
    [Key]
    public virtual string PropertyID { get; set; }

    [ForeignKey ("DNISData")]
    public virtual string DNIS { get; set; }

    public virtual string PropertyName { get; set; }
    public virtual string PropertyGreeting { get; set; }
    public virtual string PropertyOperator { get; set; }
    public virtual string InvalidEntryPrompt { get; set; }
    public virtual string NoEntryPrompt { get; set; }
    public virtual string Comment { get; set; }
    public virtual DNISData DNISData { get; set; }

}

public class DNISData
{
    [Key]
    public virtual string DNIS { get; set; }
    [ForeignKey("PropertyData")]
    public string PropertyID { get; set; }
    public virtual string VDN { get; set; }
    public virtual string PropertyGreeting { get; set; }
    public virtual string Comment { get; set; }
    public virtual PropertyData PropertyData { get; set; }
}

public class DigitData
{
    [ForeignKey ("DNISData")]
    [Key]
    public virtual string DNIS { get; set; }
    [Key]
    public virtual string Digit { get; set; }
    public virtual string InvalidEntryPrompt { get; set; }
    public virtual DNISData DNISData { get; set; }
}

Answer 1

您在 PropertyData 和 DNISData 之间存在 1 对 1 的关系。这只能通过 EntityFramework 中的共享主键来完成。

这个问题可以给你你正在寻找的答案:

How to declare one to one relationship using Entity Framework 4 Code First (POCO)