public ResultObj <List <ClassModel> > GetGroupSalesMoney(string salesDateStart = "", string salesDateEnd = "", string type = "", string clientId = "") { if (string.IsNullOrEmpty(salesDateStart) || string.IsNullOrEmpty(salesDateEnd) || string.IsNullOrEmpty(type)) { return(null); } IStatistic istatistic = new StatisticService(); return(Content(istatistic.GetGroupSalesMoney(salesDateStart, salesDateEnd, type, clientId))); }