如何为同一个父列设置两个外键（实体框架）

Question

我正在使用 ASP.NET MVC，并且我有以下类模型

职位：

public enum PosType
{
    ICC, FP
}

public class Position
{
    public int Id { get; set; }
    public string Name { get; set; }
    public PosType? PosType { get; set; }
}

员工：

public class Staff
{
    public int Id { get; set; }
    public string StaffName { get; set; }

    //FK to Position
    public int PositionId { get; set; }

    //Navigation property
    public virtual Position Position { get; set; }

会员：

public class Member
{
    public int Id { get; set; }
    public string MemberName { get; set; }

    //FK to Staff model which stores the ICC Staff Type value
    public int? StaffId { get; set; }

    //FK to Staff model which stores the FP Staff Type value
    public int? FPNumber { get; set; }

    //Navigation property 
    public virtual Staff Staff { get; set; }

在成员模型上，StaffId 属性是 Staff 模型的外键，这是一种非常直接的方法。我遇到的问题是如何处理 FPnumber 属性，因为我希望它也成为 Staff 模型的外键。我的总体目标是拥有Member.StaffId property store ICC 员工类型和Member.FPNumber property store FP 员工类型。我尝试将ForeignKey 属性添加到FPNumber 属性，但由于StaffId 从成员表中删除，它不起作用。还有其他建议吗？

Answer 1

这应该可以解决问题

public class Member
{
public int Id { get; set; }
public string MemberName { get; set; }

//FK to Staff model which stores the ICC Staff Type value
[ForeignKey("Staff")]
public int? StaffId { get; set; }

//FK to Staff model which stores the FP Staff Type value
[ForeignKey("FPStaff")]
public int? FPNumber { get; set; }

//Navigation property 
public virtual Staff Staff { get; set; }  //Use a better descriptive Name than Staff

public virtual Staff FPStaff{ get; set; }
}