public class CityService : ICityService
    {
        private readonly IUnitOfWork _uow;
        private readonly IDbSet<City> _city;

        public CityService(IUnitOfWork uow)
        {
            _uow = uow;
            _city = _uow.Set<City>();
        }

        public int AddCity(City city)
        {
            ...
        }

        public int CitiesCount()
        {
            ...
        }

        public City SearchByCityName(string cityName)
        {
            ....
        }

        public void EditCity(City city)
        {
          ...
        }


        public int RemoveCity(City city)
        {
            ...
        }


        public City GetOneCity(int cityId)
        {
            return _city.Include(a => a.Province).Include(a => a.Province.Country).FirstOrDefault(a => a.CityId == cityId);
        }

        public IList<City> AllCities()
        {
            return _city.Include(a => a.Province).Include(a => a.Province.Country).ToList();
        }

        public IList<City> SearchByProvinceId(int provinceId)
        {
            return _city.Where(c => c.ProvinceId == provinceId).ToList();
        }

        public IList<City> GetCities(int startIndex, int pageSize, string sortexpression)
        {
            if (sortexpression == string.Empty)
            {
                sortexpression = "CityId ASC";
            }

            string sortColumnName = sortexpression.Split(' ')[0];
            string sortDirection = sortexpression.Split(' ')[1];
            var citiesQuery = _city.Include(a => a.Province).Include(a => a.Province.Country).AsQueryable();
            switch (sortColumnName)
            {
                case "CityId":
                    citiesQuery = ((sortDirection.ToLower() == "asc") ? citiesQuery.OrderBy(a => a.CityId) : citiesQuery.OrderByDescending(a => a.CityId));
                    break;
                case "CityName":
                    citiesQuery = ((sortDirection.ToLower() == "asc") ? citiesQuery.OrderBy(a => a.CityName) : citiesQuery.OrderByDescending(a => a.CityName));
                    break;
                case "TelCode":
                    citiesQuery = ((sortDirection.ToLower() == "asc") ? citiesQuery.OrderBy(a => a.TelCode) : citiesQuery.OrderByDescending(a => a.TelCode));
                    break;
...
            }
            return citiesQuery.Skip(startIndex).Take(pageSize).ToList();
        }

....و هر متد دیگری که نیاز دارید
    }

public IList<User> FindUsersContainName(string name, int count = 20)