INSERT语句与FOREIGN KEY约束冲突-Entity Framework

Question

我对2个实体之间的关系有疑问；

我的课程如下：

public class Cis 
{
     [Key]
     public int CisId { get; set; }
     public int ProjectId { get; set; }

     [ForeignKey("ProjectId")] 
     public virtual ICollection<Overhead> Overheads { get; set; }

}   

public class Overhead 
{
    public int Id { get; set; }     
    public int ProjectId { get; set; }
    public SecuredWorkType SecuredWorkType { get; set; }
    public decimal? OverheadRecoveryTotalValue { get; set; }
    public decimal? BudgetedFinancialResultValue { get; set; }
    public decimal? SecuredValue { get; set; }
    public decimal? OverheadRecoveryTotalPercentage { get; set; }
}

当我尝试保存带有多个开销的CIS对象时，出现以下错误

The INSERT statement conflicted with the FOREIGN KEY constraint "FK_dbo.Overhead_dbo.Cis_ProjectId". The conflict occurred in database "CisLatest", table "dbo.Cis", column 'CisId'.The statement has been terminated."

由于设计方面的考虑，我不能将CisId用作我的外键-当我使用CisId作为外键时，它可以正常工作。

我在这里看到了类似的问题和答案，尽管它们显示将父实体放在孩子中？ 不确定在这种情况下是否适用

谢谢你的帮助。

Answer 1

尝试

public class Cis 
{
    [Key]
    public int CisId { get; set; }
    [ForeignKey("ProjectId")] //here
    public int ProjectId { get; set; }


    public virtual ICollection<Overhead> Overheads { get; set; }

}