获取今天是今年得第几周得函数

using System.Globalization;
  

public static int WeekOfTheYear()
         {            
             //获取
            CultureInfo myCI = new CultureInfo("zh-CN");
            System.Globalization.Calendar myCal = myCI.Calendar;
 
           //日期格式
           CalendarWeekRule myCWR = myCI.DateTimeFormat.CalendarWeekRule;
          DayOfWeek myFirstDOW = myCI.DateTimeFormat.FirstDayOfWeek;

            //本周为第myCal.GetWeekOfYear( DateTime.Now, myCWR, myFirstDOW )周
            int thisWeek=myCal.GetWeekOfYear( DateTime.Now, myCWR, myFirstDOW );
            return thisWeek;
        }