//计算本月有哪些天是周六，周日
            //本月开始日期
            var starMoth = DateTime.Now.AddDays(-DateTime.Now.Day + 1).Date;
            //本月截至日期
            var stopMoth = starMoth.AddMonths(1).AddDays(-1).Date;
            var listSaturday = new List<DateTime>();
            var listSunday = new List<DateTime>();
            var temp = starMoth;
            while (temp <= stopMoth)
            {
                if (temp.DayOfWeek == DayOfWeek.Saturday && temp <= stopMoth)
                {
                    listSaturday.Add(temp.Date);
                    if (temp.AddDays(1).Date <= stopMoth)
                    {
                        listSunday.Add(temp.AddDays(1));
                    }
                    temp = temp.AddDays(6);
                }
                else
                {
                    temp = temp.AddDays(1);
                }
            }
            Console.WriteLine("本月周六--");
            listSaturday.ForEach(n => Console.WriteLine(n.Date));
            Console.WriteLine("本月周日--");
            listSunday.ForEach(n => Console.WriteLine(n.Date));
            Console.ReadKey();