C#去掉周六周日的算法

        /// <summary>
        /// 用来获取工作日（不含周六周日）
        /// </summary>
        /// <param name="dtSub">公文收文日期</param>
        /// <param name="countday">工作总天数</param>
        /// <param name="weekday">工作日（初始为0）</param>
        /// <returns>工作日</returns>
        private static int GetDaysOfNoWeekend(DateTime dtSub, int countday, int weekday)
        {
            for (int i = 0; i < countday; i++)
            {
                DateTime tempdt = dtSub.Date.AddDays(i);
                if (tempdt.DayOfWeek != System.DayOfWeek.Saturday && tempdt.DayOfWeek != System.DayOfWeek.Sunday)
                {
                    weekday++;
                }
            }
            return weekday;
        }