c# - 外键映射到实体框架中的复合键

Question

尝试首先与实体框架代码建立以下关系。以下代码不起作用我尝试了很多变体......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; }

}

Answer 1

您在这里有 2 个选项。

使用您所拥有的属性，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});