Question

我们在EFCore中使用Table Per Hierarchy设置了以下模型（为简洁起见而简化）：

public class User {
  public int Id { get; set; }
}
public class Student : User {
  public Company Company { get; set; }
}
public class Teacher : User {
  public Company School { get; set; }
}

我希望所有用户（包括学生和教师）都包含所有参考。基本上我想在一个查询中执行以下操作：

_context.Users.OfType<Teacher>().Include(x => x.School);
_context.Users.OfType<Student>().Include(x => x.Company);

有办法吗？

Answer 1

根据Ivan的评论，当前（前EFCore 2.1）解决方案是：

var users = _context.Users.Where(_filter_conditions_here).Skip().Take(_if_you_like_);
var userIds = users.Select(x => x.Id).ToList()
_context.Users.OfType<Teacher>().Where(x => userIds.Contain(x.Id)).Include(x => x.School).ToList();
_context.Users.OfType<Student>().Where(x => userIds.Contain(x.Id)).Include(x => x.Company).ToList();

实体框架核心：包含在TPH上

1 个答案: