查询当前日期是当年第几周，整型数

分享C#获取当前日期是当年的第几周的方法。

好用就好。

1     /// <summary>
2     /// 查询当前日期是当年第几周，整型数
3     /// </summary>
4     /// <param name="currentDate">当前日期</param>
5     /// <returns>Integer类型</returns>
6     public static int GetCurrentWeek(DateTime currentDate)
7     {
8         try
9         {
10             DateTime firstDate = new DateTime(currentDate.Year, 1, 1);
11             int firstWeek = Convert.ToInt32(firstDate.DayOfWeek); 12             firstWeek = firstWeek.Equals(0) ? 7 : firstWeek;
13
14             int currentWeek = Convert.ToInt32(currentDate.DayOfWeek);
15             currentWeek = currentWeek.Equals(0) ? 7 : currentWeek;
16             int currentDays = Convert.ToInt32(currentDate.DayOfYear);
17
18             int n = (currentDays - 8 + firstWeek - currentWeek) / 7 + 2;
19
20             return n;
21         }
22         catch (Exception)
23         {
24             return 0;
25         }
26     }
27