in Include를 사용하여 관련 데이터 엔티티 ef Core 3.1로드

여러 수준에서 데이터를로드하려면 내 프로젝트를 dotnet core 3.1로 업데이트 한 후 include를 사용하면 작동하지 않으며 네 번째 수준은 항상 null입니다.

var oldMethod = _depositRepository.All()
                    .Include(n => n.StudentStatus.Student.Person.Gender)

ThenInclude를 사용해보십시오

var newMethod = _depositRepository.All()
                    .Include(n => n.StudentStatus)
                        .ThenInclude(s => s.Student)
                            .ThenInclude(p => p.Person)
                                .ThenInclude(g => g.Gender)

두 가지 방법 모두 Gender항상null

public IQueryable<T> All()
{
    return DbSet.AsNoTracking().AsQueryable();
}

이 튜토리얼을 따릅니다. 관련 데이터로드

편집 1 : 내 코드 중 일부

public class IEntity<IId>
{
    public IId Id { get; set; }
    public string Name { get; set; }
}

public class Gender : IEntity<byte>
{ 
}

public class Person: IEntity<int>
{
    public byte GenderId { get; set; }
    public virtual Gender Gender { get; set; }
}

public class Student : IEntity<int>
{
public int PersonId { get; set; }
public virtual Person Person { get; set; }
}

public class StudentStatus : IEntity<int>
{
    public int StudentId { get; set; }
    public virtual Student Student { get; set; }
}

public class Deposit : IEntity<int>
{
    public int StudentStatusId { get; set; }
    public StudentStatus StudentStatus { get; set; }
}
public interface IRepository<T, IId>
        where T : IEntity<IId>
{
    IQueryable<T> All();
}
public class EfRepository<T, IId> : IRepository<T, IId>
        where T : IEntity<IId>
{
    private readonly UniversityDbContext _dbContext;

    public EfRepository(UniversityDbContext dbContext)
    {
        _dbContext = dbContext;
    }

    private DbSet<T> DbSet => _dbContext.Set<T>();

    public IQueryable<T> All()
    {
        return DbSet.AsNoTracking().AsQueryable();
    }

public class FinancialController : Controller
{
    private readonly IRepository<Deposit, int> _depositRepository;

    public FinancialController(IRepository<Deposit, int>)
    {
        _depositRepository = depositRepository;
    }

    public IActionResult GetStatistic()
    {
        var model= _depositRepository.All()
                        .Include(n => n.StudentStatus)
                            .ThenInclude(s => s.Student)
                                .ThenInclude(p => p.Person)
                                    .ThenInclude(g => g.Gender).ToList();
        return Json(model);
    }
}