public StudentService(
     IStudentRepository studentRepository,
     IGroupRepository groupRepository,
     IDormitoryRoomRepository dormitoryRoomRepository) : base(studentRepository)
 {
     _studentRepository       = studentRepository;
     _groupRepository         = groupRepository;
     _dormitoryRoomRepository = dormitoryRoomRepository;
 }
 public DormitoryRoomService(IDormitoryRoomRepository dormitoryRoomRepository) : base(dormitoryRoomRepository)
 {
     _dormitoryRoomRepository = dormitoryRoomRepository;
 }