获取两个日期之间的工作日天数以及获取两个日期之间的所有日期的列表

1.首先是代码实现：

1.1获取工作日天数

        /// <summary>
        /// 获取两个日期之间的工作日天数
        /// </summary>
        /// <param name="BeginDate">开始日期</param>
        /// <param name="EndDate">结束日期</param>
        /// <returns></returns>
        public int GetWorkDays(string BeginDate, string EndDate)
        {
            DateTime Start = Convert.ToDateTime(BeginDate);
            DateTime End = Convert.ToDateTime(EndDate); ;//获取今天日期
            TimeSpan Tspan = End.Subtract(Start);//TimeSpan得到dt1和dt2的时间间隔
            int DayCount = Tspan.Days;//获取两个日期间的总天数
            int WorkDayCount = 0;//工作日
            //循环用来扣除总天数中的双休日
            for (int i = 0; i <= DayCount; i++)
            {
                DateTime tempdt = Start.Date.AddDays(i);
                if (tempdt.DayOfWeek != System.DayOfWeek.Saturday && tempdt.DayOfWeek != System.DayOfWeek.Sunday)
                {
                    WorkDayCount++;
                }
            }
            return WorkDayCount;
        }

 1.2 获取两个日期之间的日期列表：

此处根据传入月份和年份实现，同样也可以传入两个日期进行实现，同时附加两个获取年份和月份列表的函数。

        /// <summary>
        /// 根据月份获取当前月份的天数
        /// </summary>
        /// <param name="Years">年份</param>
        /// <param name="Month">月份</param>
        /// <returns></returns>
        public List<string> GetDayList(string Years, int Month)
        {
            List<string> List = new List<string>();
            int Day = DateTime.DaysInMonth(int.Parse(Years), Month); ;
            for (int i = 0; i <= Day; i++)
            {
                List.Add(string.Format(@"{0}-{1}-{2}", Years, Month.ToString("D2"), i.ToString("D2")));
            }
            return List;
        }
        public SelectList GetYearsList()
        {
            var options = new List<SelectListItem>();
            int Year = DateTime.Now.Year;
            for (int i = Year; i < 2016; i--)
            {
                options.Add(new SelectListItem { Text = i.ToString(), Value = i.ToString() });
            }
            return new SelectList(options, "Value", "Text", "");
        }
        public SelectList GetMonthList()
        {
            var options = new List<SelectListItem>();
            int Year = DateTime.Now.Year;
            for (int i = 1; i <= 12; i++)
            {
                options.Add(new SelectListItem { Text = i.ToString(), Value = i.ToString() });
            }
            return new SelectList(options, "Value", "Text", "");
        }
    }

2 SQL 实现：

2.1获取工作日列表。

select * from 
(
SELECT CONVERT(NVARCHAR(10), DateAdd(day,number,'2017-09-29'),120) AS Date,  
Datename(weekday, CONVERT(NVARCHAR(10), DateAdd(day,number,'2017-09-29'),120)) as Type
FROM master..spt_values  
WHERE type = 'p' AND number <= DateDiff(day,'2014-09-29','2019-10-29')) as b 
where Type<>'星期六' and Type<>'星期日'  

 2.2 获取日期列表：

SELECT CONVERT(NVARCHAR(10), DateAdd(day,number,'2017-09-29'),120) AS Date,  
Datename(weekday, CONVERT(NVARCHAR(10), DateAdd(day,number,'2017-09-29'),120)) as Type
FROM master..spt_values  
WHERE type = 'p' AND number <= DateDiff(day,'2014-09-29','2019-10-29')