可以使用实体框架在另一个表中调用两次作为外键的主键吗？

Posted 2023-03-29

【中文标题】可以使用实体框架在另一个表中调用两次作为外键的主键吗？

【英文标题】：Can a primary key called twice in another table as foreign key using Entity Framework?

【发布时间】：2021-10-25 20:49:19

【问题描述】：

如何在两列中使用主键作为另一个表的外键。

public class ResumeSharing

        [Key]
        public int ResumeSharingId  get; set; 
        [ForeignKey("AppliedJobs")]
        public int AppliedJobId  get; set; 
        public virtual AppliedJob AppliedJobs  get; set; 
        public bool OwnCompany  get; set; 
        [Display(Name = "RecruiterFrom")]
        public int RecruiterId  get; set; 
        public virtual Recruiter Recruiters  get; set; 

        [Display(Name = "RecruiterTo")]
        public int RecruiterId  get; set; 
        public virtual Recruiter Recruiters  get; set; 

        [ForeignKey("Companies")]
        public int CompanyId  get; set; 
        public virtual Company Companies  get; set; 

        public string SharedFiles  get; set; 

我想在此表中调用RecruiterId 两次。我该怎么做？

【问题讨论】：

调用主键是什么意思？你的意思是 reference 吗？就像在子表中存储两次一样？

【参考方案1】：

你必须添加导航属性

public class ResumeSharing
    
        [Key]
        public int ResumeSharingId  get; set; 

        [ForeignKey("AppliedJob")]
        public int AppliedJobId  get; set; 
        public virtual AppliedJob AppliedJob  get; set; 
        public bool OwnCompany  get; set; 

        [Display(Name = "RecruiterFrom")]
        public int RecruiterFromId  get; set; 
        [ForeignKey(nameof(RecruiterFromId))]
        [InverseProperty("RecruiterFroms")]
        public virtual Recruiter RecruiterFrom  get; set; 

        [Display(Name = "RecruiterTo")]
        public int RecruiterToId  get; set; 
       [ForeignKey(nameof(RecruiterToId))]
        [InverseProperty("RecruiterTos")]
        public virtual Recruiter RecruiterTo  get; set; 

        [ForeignKey("Company")]
        public int CompanyId  get; set; 
        public virtual Company Company  get; set; 

        public string SharedFiles  get; set; 
    


public class Recruiter

[Key]
 public int Id  get; set; 

[InverseProperty(nameof(ResumeSharing.RecruiterFrom))]
public virtual ICollection<Recruiter> RecruiterFroms  get; set; 


[InverseProperty(nameof(ResumeSharing.RecruiterTo))]
public virtual ICollection<Recruiter> RecruiterTos  get; set;