region UserCard public UserCardDTO GetUserCard int id var userCard map

#region UserCard

        public UserCardDTO GetUserCard(int id) {
            var userCard = mapper.Map<UserCard, UserCardDTO>(unitOfWork.UserCards
                .GetSingle(x => x.Id == id));
            return userCard ?? throw new UserCardNotFoundException();
        }

        public UserCardDTO GetUserCard(string firstName, string lastName) {
            var userCard = mapper.Map<UserCard, UserCardDTO>(unitOfWork.UserCards.GetSingle(x => 
                firstName == null ? true : x.FirstName == firstName &&
                lastName == null ? true : x.LastName == lastName
            ));
            return userCard ?? throw new UserCardNotFoundException();
        }

        public UserCardDTO GetUserCard(int? id, string firstName, string lastName) {
            var userCard = mapper.Map<UserCard, UserCardDTO>(unitOfWork.UserCards.GetSingle(x =>
                id == null ? true : x.Id == id &&
                firstName == null ? true : x.FirstName == firstName &&
                lastName == null ? true : x.LastName == lastName
            ));
            return userCard ?? throw new UserCardNotFoundException();
        }

        public IEnumerable<UserCardDTO> GetUserCards() {
            var userCards = mapper.Map<IEnumerable<UserCard>, IList<UserCardDTO>>(unitOfWork
                .UserCards.GetAll());
            return userCards.Count != 0 ? userCards : throw new UserCardNotFoundException();
        }

        public IEnumerable<UserCardDTO> GetUserCards(int? id, string firstName, string lastName) {
            var userCards = mapper.Map<IEnumerable<UserCard>, IList<UserCardDTO>>(unitOfWork.UserCards.FindBy(x =>
                id == null ? true : x.Id == id &&
                firstName == null ? true : x.FirstName == firstName &&
                lastName == null ? true : x.LastName == lastName
            ));
            return userCards.Count != 0 ? userCards : throw new UserCardNotFoundException();
        }

        #endregion