Calendar.GetWeekOfYear(DateTime, CalendarWeekRule, DayOfWeek) Méthode

Définition

Retourne la semaine de l’année qui contient la date de la valeur DateTime spécifiée.

public:
 virtual int GetWeekOfYear(DateTime time, System::Globalization::CalendarWeekRule rule, DayOfWeek firstDayOfWeek);
public virtual int GetWeekOfYear (DateTime time, System.Globalization.CalendarWeekRule rule, DayOfWeek firstDayOfWeek);
abstract member GetWeekOfYear : DateTime * System.Globalization.CalendarWeekRule * DayOfWeek -> int
override this.GetWeekOfYear : DateTime * System.Globalization.CalendarWeekRule * DayOfWeek -> int
Public Overridable Function GetWeekOfYear (time As DateTime, rule As CalendarWeekRule, firstDayOfWeek As DayOfWeek) As Integer

Paramètres

time
DateTime

Valeur de date et heure.

rule
CalendarWeekRule

Valeur d’énumération qui définit une semaine du calendrier.

firstDayOfWeek
DayOfWeek

Valeur d'énumération qui représente le premier jour de la semaine.

Retours

Int32

Entier positif qui représente la semaine de l’année qui inclut la date dans le paramètre time.

Exceptions

time est antérieur à MinSupportedDateTime ou ultérieur à MaxSupportedDateTime.

- ou -

firstDayOfWeek n’est pas une valeur de DayOfWeek valide.

- ou -

rule n’est pas une valeur de CalendarWeekRule valide.

Exemples

L’exemple de code suivant montre comment le résultat de GetWeekOfYear varie en fonction du FirstDayOfWeek et du CalendarWeekRule utilisé. Si la date spécifiée est le dernier jour de l’année, GetWeekOfYear retourne le nombre total de semaines de cette année.

using namespace System;
using namespace System::Globalization;
int main()
{
   
   // Gets the Calendar instance associated with a CultureInfo.
   CultureInfo^ myCI = gcnew CultureInfo( "en-US" );
   Calendar^ myCal = myCI->Calendar;
   
   // Gets the DTFI properties required by GetWeekOfYear.
   CalendarWeekRule myCWR = myCI->DateTimeFormat->CalendarWeekRule;
   DayOfWeek myFirstDOW = myCI->DateTimeFormat->FirstDayOfWeek;
   
   // Displays the number of the current week relative to the beginning of the year.
   Console::WriteLine( "The CalendarWeekRule used for the en-US culture is {0}.", myCWR );
   Console::WriteLine( "The FirstDayOfWeek used for the en-US culture is {0}.", myFirstDOW );
   Console::WriteLine( "Therefore, the current week is Week {0} of the current year.", myCal->GetWeekOfYear( DateTime::Now, myCWR, myFirstDOW ) );
   
   // Displays the total number of weeks in the current year.
   DateTime LastDay = System::DateTime( DateTime::Now.Year, 12, 31 );
   Console::WriteLine( "There are {0} weeks in the current year ( {1}).", myCal->GetWeekOfYear( LastDay, myCWR, myFirstDOW ), LastDay.Year );
}

/*
This code produces the following output.  Results vary depending on the system date.

The CalendarWeekRule used for the en-US culture is FirstDay.
The FirstDayOfWeek used for the en-US culture is Sunday.
Therefore, the current week is Week 1 of the current year.
There are 53 weeks in the current year (2001).
*/
using System;
using System.Globalization;

public class SamplesCalendar  {

   public static void Main()  {

      // Gets the Calendar instance associated with a CultureInfo.
      CultureInfo myCI = new CultureInfo("en-US");
      Calendar myCal = myCI.Calendar;

      // Gets the DTFI properties required by GetWeekOfYear.
      CalendarWeekRule myCWR = myCI.DateTimeFormat.CalendarWeekRule;
      DayOfWeek myFirstDOW = myCI.DateTimeFormat.FirstDayOfWeek;

      // Displays the number of the current week relative to the beginning of the year.
      Console.WriteLine( "The CalendarWeekRule used for the en-US culture is {0}.", myCWR );
      Console.WriteLine( "The FirstDayOfWeek used for the en-US culture is {0}.", myFirstDOW );
      Console.WriteLine( "Therefore, the current week is Week {0} of the current year.", myCal.GetWeekOfYear( DateTime.Now, myCWR, myFirstDOW ));

      // Displays the total number of weeks in the current year.
      DateTime LastDay = new System.DateTime( DateTime.Now.Year, 12, 31 );
      Console.WriteLine( "There are {0} weeks in the current year ({1}).", myCal.GetWeekOfYear( LastDay, myCWR, myFirstDOW ), LastDay.Year );
   }
}

/*
This code produces the following output.  Results vary depending on the system date.

The CalendarWeekRule used for the en-US culture is FirstDay.
The FirstDayOfWeek used for the en-US culture is Sunday.
Therefore, the current week is Week 1 of the current year.
There are 53 weeks in the current year (2001).

*/
Imports System.Globalization

Public Class SamplesCalendar

   Public Shared Sub Main()
      
      ' Gets the Calendar instance associated with a CultureInfo.
      Dim myCI As New CultureInfo("en-US")
      Dim myCal As Calendar = myCI.Calendar
      
      ' Gets the DTFI properties required by GetWeekOfYear.
      Dim myCWR As CalendarWeekRule = myCI.DateTimeFormat.CalendarWeekRule
      Dim myFirstDOW As DayOfWeek = myCI.DateTimeFormat.FirstDayOfWeek
      
      ' Displays the number of the current week relative to the beginning of the year.
      Console.WriteLine("The CalendarWeekRule used for the en-US culture is {0}.", myCWR)
      Console.WriteLine("The FirstDayOfWeek used for the en-US culture is {0}.", myFirstDOW)
      Console.WriteLine("Therefore, the current week is Week {0} of the current year.", myCal.GetWeekOfYear(DateTime.Now, myCWR, myFirstDOW))
      
      ' Displays the total number of weeks in the current year.
      Dim LastDay = New System.DateTime(DateTime.Now.Year, 12, 31)
      Console.WriteLine("There are {0} weeks in the current year ({1}).", myCal.GetWeekOfYear(LastDay, myCWR, myFirstDOW), LastDay.Year)
   End Sub
End Class


'This code produces the following output.  Results vary depending on the system date.
'
'The CalendarWeekRule used for the en-US culture is FirstDay.
'The FirstDayOfWeek used for the en-US culture is Sunday.
'Therefore, the current week is Week 1 of the current year.
'There are 53 weeks in the current year (2001).

Remarques

Cette méthode peut être utilisée pour déterminer le nombre de semaines dans l’année en définissant time sur le dernier jour de l’année.

L’objet DateTimeFormatInfo d’une culture particulière qui utilise le calendrier indiqué par la DateTimeFormatInfo.Calendar propriété inclut les valeurs spécifiques à la culture suivantes qui peuvent être utilisées pour les rule paramètres et firstDayOfWeek :

Remarque

Cela ne correspond pas exactement à la norme ISO 8601. Les différences sont abordées dans l’entrée de blog au format ISO 8601 semaine de l’année dans Microsoft .NET. À partir de .NET Core 3.0, ISOWeek.GetYear et ISOWeek.GetWeekOfYear résolvez ce problème.

L’exemple suivant utilise l’objet de DateTimeFormatInfo la culture actuelle pour déterminer que le 1er janvier 2011 est la première semaine de l’année dans le calendrier grégorien.

using System;
using System.Globalization;

public class Example
{
   public static void Main()
   {
      DateTimeFormatInfo dfi = DateTimeFormatInfo.CurrentInfo;
      DateTime date1 = new DateTime(2011, 1, 1);
      Calendar cal = dfi.Calendar;

      Console.WriteLine("{0:d}: Week {1} ({2})", date1,
                        cal.GetWeekOfYear(date1, dfi.CalendarWeekRule,
                                          dfi.FirstDayOfWeek),
                        cal.ToString().Substring(cal.ToString().LastIndexOf(".") + 1));
   }
}
// The example displays the following output:
//       1/1/2011: Week 1 (GregorianCalendar)
Imports System.Globalization

Module Example
   Public Sub Main()
      Dim dfi As DateTimeFormatInfo = DateTimeFormatInfo.CurrentInfo
      Dim date1 As Date = #1/1/2011#
      Dim cal As Calendar = dfi.Calendar
      
      Console.WriteLine("{0:d}: Week {1} ({2})", date1, 
                        cal.GetWeekOfYear(date1, dfi.CalendarWeekRule, 
                                          dfi.FirstDayOfWeek),
                        cal.ToString().Substring(cal.ToString().LastIndexOf(".") + 1))       
   End Sub
End Module
' The example displays the following output:
'       1/1/2011: Week 1 (GregorianCalendar)

Pour certains calendriers, un appel à la GetWeekOfYear méthode lève un ArgumentOutOfRangeException pour des combinaisons particulières de rule valeurs et firstDayOfWeek même si time est supérieur à la date retournée par la propriété de MinSupportedDateTime ce calendrier. Le tableau suivant répertorie les calendriers affectés, les valeurs spécifiques rule et la plage des premières valeurs prises en charge time . La valeur minimale DateTime spécifique dépend de la valeur du firstDayOfWeek paramètre .

Calendrier Valeur CalendarWeekRule Date grégorienne (M/jj/aaaa) Date dans le calendrier (M/jj/aaaa)
ChineseLunisolarCalendar FirstFullWeek 19/02/1901 au 25/02/1901 1/1/1901 au 7/1/1901
ChineseLunisolarCalendar FirstFourDayWeek 19/02/1901 au 22/02/1901 1/01/1901 au 04/1/1901
HebrewCalendar FirstDay 9/17/1583 1/01/5344
HebrewCalendar FirstFullWeek 17/09/1583 au 23/09/1583 1/01/5344 au 07/01/5344
HebrewCalendar FirstFourDayWeek 17/09/1583 au 20/09/1583 1/01/5344 au 04/01/5344
HijriCalendar FirstFullWeek 18/07/0622 au 24/07/0622 1/01/0001 au 07/01/0001
HijriCalendar FirstFourDayWeek 18/07/0622 au 21/07/0622 1/01/0001 au 04/01/0001
JapaneseLunisolarCalendar FirstFullWeek 28/01/1960 au 03/02/1960 1/01/35 au 07/01/0035
JapaneseLunisolarCalendar FirstFourDayWeek 28/01/1960 au 31/1/1960 1/01/0035 au 04/01/0035
JulianCalendar FirstFullWeek 1/01/0001 au 05/01/0001 1/03/0001 au 07/01/0001
JulianCalendar FirstFourDayWeek 1/01/0001 au 02/01/0001 1/03/0001 au 04/01/0001
KoreanLunisolarCalendar FirstFullWeek 14/02/0918 au 20/0918 1/01/0918 au 07/01/0918
KoreanLunisolarCalendar FirstFourDayWeek 14/02/0918 au 17/02/0918 1/01/0918 au 04/01/0918
PersianCalendar FirstFullWeek 21/0622 au 27/03/0622 1/01/0001 au 07/01/0001
PersianCalendar FirstFourDayWeek 21/0622 au 24/03/0622 1/01/0001 au 04/01/0001
TaiwanLunisolarCalendar FirstFullWeek 18/02/1912 au 24/02/1912 1/01/0001 au 07/01/0001
TaiwanLunisolarCalendar FirstFourDayWeek 18/02/1912 au 21/02/1912 1/01/0001 au 04/01/0001
UmAlQuraCalendar FirstFullWeek 30/04/1900 au 06/05/1900 1/01/1318 au 07/01/1318
UmAlQuraCalendar FirstFourDayWeek 30/04/1900 au 03/05/1900 1/01/1318 au 04/1/1318

S’applique à

Voir aussi