AlunoAsNoTracking.cs

public IQueryable<AlunoDto> BuscarTodosAlunoDtos()
{
    var alunos = (
        from al in _context.Alunos
        join pe in _context.Pessoas on al.Id equals pe.Id
        into alu
        from alun in alu.DefaultIfEmpty()

        join at in _context.AlunoTurmas on al.Id equals at.AlunoId into alt
        from ats in alt.DefaultIfEmpty()

        join tu in _context.Turmas on ats.TurmaId equals tu.Id into tur
        from turm in tur.DefaultIfEmpty()

        join se in _context.Series on turm.SerieId equals se.Id
        into ser
        from seri in ser.DefaultIfEmpty()

        join cur in _context.Cursos on seri.CursoId equals cur.Id
        into cu
        from cur in cu.DefaultIfEmpty()
        select new AlunoDto()
        {
            Id = al.Id,
            DataNascimento = al.Pessoa.DataNascimento,
            Matricula = al.Matricula,
            Curso = cur,
            Serie = seri,
            Pessoa = alun,
            Turma = turm
        }
    ).GroupBy(c => c.Id, (key, c) => c.FirstOrDefault()).AsNoTracking();
    
    return alunos;
}