某年共經歷多少周

 public   int  GetWeek(string strYear)
  {
   string   returnStr="";
   
   System.DateTime   fDt=DateTime.Parse(strYear+"-01-01");
   int   k=Convert.ToInt32(fDt.DayOfWeek);//得到該年的第一天是周幾
   if(k==1)
   {
    int countDay = fDt.AddYears(1).AddDays(-1).DayOfYear;
    int countWeek = countDay/7+1;
    return countWeek;
    
   }
   else
   {
    int countDay = fDt.AddYears(1).AddDays(-1).DayOfYear;
    int countWeek = countDay/7+2;
    return countWeek;
   }
   
  }