查看MSDN
http://msdn.microsoft.com/zh-cn/library/system.globalization.calendar.getweekofyear.aspx

Check out MSDN
http://msdn.microsoft.com/en-us/library/system.globalization.calendar.getweekofyear.aspx

尝试一下:

try this :

public static int GetWeekNumber(DateTime dtPassed)
{
        CultureInfo ciCurr = CultureInfo.CurrentCulture;
        int weekNum = ciCurr.Calendar.GetWeekOfYear(dtPassed, CalendarWeekRule.FirstFourDayWeek, DayOfWeek.Monday);
        return weekNum;
}

希望对您有所帮助:)

hope it helps :)