鉴于此 sql 架构:
create table [dbo].[Courses_Students] (
[DummyColumn] [int] null,
[CourseId] [int] not null,
[StudentId] [int] not null,
primary key ([CourseId], [StudentId])
);
如何在 ? 中定义复合主键和附加列EntityConfiguration
?
鉴于此 sql 架构:
create table [dbo].[Courses_Students] (
[DummyColumn] [int] null,
[CourseId] [int] not null,
[StudentId] [int] not null,
primary key ([CourseId], [StudentId])
);
如何在 ? 中定义复合主键和附加列EntityConfiguration
?
你需要声明一个类Courses_Students
public class Courses_Students
{
[Key]
public int CourseId { get; set; }
public int StudentId { get; set; }
public int DummyColumn { get; set; }
public virtual ICollection<Course> Courses { get; set; }
public virtual ICollection<Student> Students { get; set; }
}
CourseId 上的 Key 是为了防止编译错误,接下来您将覆盖它。
然后,在您的 DbContext 类中,您像这样覆盖 OnModelCreating:
protected override void OnModelCreating(ModelBuilder modelBuilder)
{
modelBuilder.Entity<Courses_Students>()
.HasKey(e => new { e.CourseId, e.StudentId })
.MapSingleType()
.ToTable("Courses_Students");
}