根据年份-月份，获得此月份的所有日期

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        /// <summary>        /// 根据年份-月份，获得此月份的所有日期        /// </summary>        /// <param name="year">年份</param>        /// <param name="month">月份</param>        /// <returns></returns>        public static ArrayList GetMonth(int year, int month)        {            ArrayList arr = new ArrayList();            var first = new DateTime(year, month, 1);            var last = new DateTime(month == 12 ? year + 1 : year, month == 12 ? 1 : month + 1, 1);            var days = last.Subtract(first).Days;            var prevDays = (int)first.DayOfWeek;            var nextDays = 7 - (int)last.DayOfWeek;            var result = new StringBuilder("");            for (int i = -prevDays; i < prevDays + days + nextDays; i++)            {                if (i > -1 && i < days)                {                    arr.Add((i + 1).ToString());                }            }            return arr;        }