外键映射到实体框架中的组合键

本文关键字：组合 框架 实体 映射 | 更新日期: 2023-09-27 17:49:36

尝试先与实体框架代码建立以下关系。下面的代码不工作，我已经尝试了很多变化…有人知道吗?

CONSTRAINT [FK_EVENT_Contact] FOREIGN KEY (Patient_ID,[Contact_ID]) REFERENCES
[PatientContact](Patient_ID,Person_ID)

public class PatientContact
{
    [Key, Column(Order = 0)]
    [DatabaseGenerated(DatabaseGeneratedOption.None)]
    public int Person_ID { get; set; }
    public virtual Person Person { get; set; }
    [Key, Column(Order = 1)]
    [DatabaseGenerated(DatabaseGeneratedOption.None)]
    public int Patient_ID { get; set; }
    public virtual Patient Patient { get; set; }
}
public class Event
{
    [Key]
    public int Event_ID { get; set; }
    [Required]
    public int EventType_ID {get;set;}
    public virtual EventType EventType { get; set; }
    [ForeignKey("Patient")]
    public int Patient_ID { get; set; }
    public virtual Patient Patient { get; set; }
    [ForeignKey("PatientContact")]
    public int Contact_ID { get; set; }
    public virtual PatientContact PatientContact { get; set; }
}

外键映射到实体框架中的组合键

你有两个选择。

尽量使用属性例如:

[ForeignKey("PatientContact"), Column(Order = 0)]
public int Person_ID{ get; set; }
[ForeignKey("PatientContact"), Column(Order = 1)]
public int Patient_ID{ get; set; }
public virtual PatientContact PatientContact { get; set; }

使用模型构建器(fluent api)

modelBuilder.Entity<Event>()
    .HasRequired(p => p.PatientContact)
    .WithMany()
    .HasForeignKey(p => new {p.Person_ID, p.Patient_ID});
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