Question

好的，所以我有一个表格建筑，其中包括该建筑物中的所有人员。但是，每个Person都有一个专业，它本身就是一个实体，根据可用的内容添加到Person实体中。

var data = _dbcontext.Building
        .Where(m => m.BuildingId == buildingId)
        .Include(x => x.Person).ThenInclude(x => x.Doctor)
        .Include(x => x.Person).ThenInclude(x => x.Teacher)
        .Include(x => x.Person).ThenInclude(x => x.Farmer)
        .Include(x => x.Person).ThenInclude(x => x.Prostitute);

这就是我在网上发现的方式，但它实际上似乎包括了Person实体4次，所以我有大量重复。我真的只想要一次，但我想离开加入专业实体。

外键都设置正确，我使用EF来创建我的模型。以下是Person实体的样子：

public partial class Person {
    public int PersonId { get; set; }
    public int? DoctorId { get; set; }
    public int? TeacherId { get; set; }
    public int? FarmerId { get; set; }
    public int? ProstituteId { get; set; }
    public int BuildingId { get; set; }

    public Doctor Doctor { get; set; }
    public Teacher Teacher { get; set; }
    public Farmer Farmer { get; set; }
    public Prostitute Prostitute { get; set; }
}

Answer 1

var data = _dbcontext.Person
    .Where(p => p.BuildingId == buildingId)
    .Include(p => p.Building)
    .Include(p => p.Doctor)
    .Include(p => p.Teacher)
    .Include(p => p.Farmer)
    .Include(p => p.Prostitute)
    .OrderBy(p => p.Building;

多个Include / ThenInclude在EF Core中导致重复

1 个答案: