得到时间段内周末的天数

 1         /// <summary>
 2         /// 得到一个时间段内周末的天数
 3         /// </summary>
 4         /// <param name="stDate">开始时间</param>
 5         /// <param name="endDate">结束时间</param>
 6         /// <returns></returns>
 7         public double GetWeekEndTotalDays(DateTime stDate,DateTime endDate)
 8         {
 9             double weekEndCount = 0.000;
10 
11             if (endDate.Date.ToString() == stDate.Date.ToString() &&
12                 (stDate.DayOfWeek.ToString() == "Saturday" || stDate.DayOfWeek.ToString() == "Sunday"))
13             {
14                 weekEndCount += (endDate - stDate).TotalDays;
15                 return weekEndCount;
16             }
17 
18             //计算不在活动范围内的周末的天数
19             if (stDate.DayOfWeek.ToString() == "Saturday" || stDate.DayOfWeek.ToString() == "Sunday")
20                 weekEndCount += (stDate.AddDays(1).Date - stDate).TotalDays;
21             stDate = stDate.AddDays(1).Date;
22             if (endDate.DayOfWeek.ToString() == "Saturday" || endDate.DayOfWeek.ToString() == "Sunday")
23                 weekEndCount += (endDate - endDate.AddDays(-1).Date).TotalDays;
24             endDate = endDate.AddDays(-1).Date;
26 
27             TimeSpan tsWeekEnd = endDate - stDate;
28             for (int j = 0; j <= tsWeekEnd.Days; j++)
29             {
30                 if (stDate.DayOfWeek.ToString() == "Saturday" || stDate.DayOfWeek.ToString() == "Sunday")
31                 {
32                     weekEndCount += 1;
33                 }
34             }
35             return weekEndCount;
36         }