摘要：SQL方式 /// <summary> /// 最简单的方式由SQL计算 /// </summary> /// <param name="expression">表达式</param> /// <returns></returns> public static float CalcBySQL(str 阅读全文

摘要：)select @@IDENTITY; 阅读全文

摘要：List <DateTime> li = new List<DateTime>(); DateTime time1 = Convert.ToDateTime(CHECKIN_TIME); DateTime time2 = Convert.ToDateTime(CHECKOUT_TIME).AddDa 阅读全文