Question

我有一个只有两个外键的实体，我得到一个例外：

列名称LookUpTypId无效

两者都有相同的代码，但只有一个导致异常

public class Term
{
    public Term ()
    {
        RequestTimes = new HashSet<RequestTime>();
    }

    public decimal Id { get; set; }
    public string AcademicYear { get; set; }
    public string Semester { get; set; }
    public int? NumberOfDays { get; set; }
    public bool Active { get; set; }
    public bool Reserve { get; set; }
    public string Description { get; set; }

    public virtual ICollection<RequestTime> RequestTimes { get; set; }
}

public class LookUp
{
    public LookUp()
    {
        RequestTimes = new HashSet<RequestTime>();
    }

    public int Id { get; set; }
    public string Group { get; set; }
    public string Key { get; set; }
    public string Value { get; set; }

    public virtual ICollection<RequestTime> RequestTimes { get; set; }
}

public class RequestTime
{
    public decimal Id { get; set; }
    public DateTime FromTime { get; set; }
    public DateTime ToTime { get; set; }
    public int RequestMaxNumber { get; set; }

    public virtual int LookUpTypId { get; set; }
    public virtual decimal TermId { get; set; }

    [ForeignKey("TermId")]
    public virtual Term Term { get; set; }

    [ForeignKey("LookUpTypId")]
    public virtual LookUp LookUp { get; set; }
}


//relationship  in RequestTimeMap
this.HasRequired<LookUp>(rt => rt.LookUp)
            .WithMany(lk => lk.RequestTimes)
            .HasForeignKey(rt => rt.LookUpTypId);

this.HasRequired<Term>(rt => rt.Term)
            .WithMany(t => t.RequestTimes)
            .HasForeignKey(rt => rt.TermId);

谢谢

Answer 1

据我所知，ForeignKey属性应该在表示外键的属性中使用。

如果你有一个对象作为一个属性，它应该在它的正上方...除非你还有一个单独的属性为它的Id。在这种情况下，您应该使用Id属性上方的属性。

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

[ForeignKey("TermId")]
public virtual decimal TermId { get; set; }


public virtual Term Term { get; set; }

public virtual LookUp LookUp { get; set; }

并且......这个ID是十进制的吗？

无效的列名称 - 一对多关系 - 实体框架

1 个答案: