/// <summary>
    /// 财务记录
    /// </summary>
    public interface IBillService : IDynamicService {
        /// <summary>
        /// 添加或更新财务记录
        /// </summary>
        /// <param name="entity"></param>
        /// <returns></returns>
        void AddOrUpdate(Bill entity);

        /// <summary>
        /// 批量添加或更新财务记录
        /// </summary>
        /// <param name="soucre"></param>
        /// <returns></returns>
        void AddOrUpdate(IEnumerable<Bill> soucre);

        /// <summary>
        /// 获取一条财务记录
        /// </summary>
        /// <param name="id">c财务记录ID</param>
        /// <returns></returns>
        Bill GetSingle(long? id);

        /// <summary>
        /// 获取财务记录列表
        /// </summary>
        /// <param name="predicate">查询条件</param>
        /// <returns></returns>
        List<Bill> GetList(Expression<Func<Bill, bool>> predicate = null);

        /// <summary>
        /// 获取分页记录的财务记录
        /// </summary>
        /// <param name="query">查询条件</param>
        /// <param name="predicate">查询条件</param>
        /// <returns></returns>
        PagedList<Bill> GetPagedList(QueryModel query, Expression<Func<Bill, bool>> predicate = null);

        /// <summary>
        /// 删除财务记录
        /// </summary>
        /// <param name="id"></param>
        /// <returns></returns>
        void Delete(long? id);

    }

  public class BillService : ServiceBase, IBillService {
        public void AddOrUpdate(IEnumerable<Bill> soucre) {
            if (soucre == null)
                throw new ArgumentNullException(nameof(soucre));
            foreach (var item in soucre) {
                AddOrUpdate(item);
            }
        }

        public void AddOrUpdate(Bill entity) {
            if (entity.Id > 0) {
                Repository<BillRepository>().UpdateSingle(entity);
            } else {
                Repository<BillRepository>().AddSingle(entity);
            }
        }

        public void Delete(long? id) {
            Repository<BillRepository>().Delete(r=>r.Id==id);
        }

        public List<Bill> GetList(Expression<Func<Bill, bool>> predicate = null) {
            throw new NotImplementedException();
        }

        public PagedList<Bill> GetPagedList(QueryModel query, Expression<Func<Bill, bool>> predicate = null) {
            return Repository<BillRepository>().ReadMany(query, predicate);
        }

        public Bill GetSingle(long? id) {
            return Repository<BillRepository>().ReadSingle(e => e.Id == id);
        }
    }