获取日期之间的工作日（除去周六、日）

        /// <summary>        /// 获取日期段里的工作日【除去 周六、日】        /// </summary>        /// <param name="startDate"></param>        /// <param name="endDate"></param>        /// <returns></returns>        public static long dateDiff(String startDate, String endDate)        {            DateTime fromTime = CommonFunc.StringToDate(startDate);            DateTime toTime = CommonFunc.StringToDate(endDate);            TimeSpan ts = toTime.Subtract(fromTime);//TimeSpan得到fromTime和toTime的时间间隔            long countday = ts.Days;//获取两个日期间的总天数            long weekday = 0;//工作日            //循环用来扣除总天数中的双休日            for (int i = 0; i < countday; i++)            {                DateTime tempdt = fromTime.Date.AddDays(i + 1);                if (tempdt.DayOfWeek != System.DayOfWeek.Saturday && tempdt.DayOfWeek != System.DayOfWeek.Sunday)                {                    weekday++;                }            }            return weekday;       }