Calendar.GetWeekOfYear(DateTime, CalendarWeekRule, DayOfWeek) Metodo

Definizione

Restituisce la settimana dell'anno che comprende la data nel valore DateTime specificato.Returns the week of the year that includes the date in the specified DateTime value.

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

Parametri

time
DateTime

Valore di data e ora.A date and time value.

rule
CalendarWeekRule

Valore di enumerazione che definisce una settimana di calendario.An enumeration value that defines a calendar week.

firstDayOfWeek
DayOfWeek

Valore di enumerazione che rappresenta il primo giorno della settimana.An enumeration value that represents the first day of the week.

Restituisce

Valore intero positivo che rappresenta la settimana dell'anno che include la data nel parametro time.A positive integer that represents the week of the year that includes the date in the time parameter.

Eccezioni

time è precedente a MinSupportedDateTime o successivo a MaxSupportedDateTime.time is earlier than MinSupportedDateTime or later than MaxSupportedDateTime.

-oppure--or- firstDayOfWeek non è un valore DayOfWeek valido.firstDayOfWeek is not a valid DayOfWeek value.

-oppure--or- rule non è un valore CalendarWeekRule valido.rule is not a valid CalendarWeekRule value.

Esempio

Nell'esempio di codice seguente viene illustrato il modo in cui il risultato di GetWeekOfYear varia a seconda della FirstDayOfWeek e del CalendarWeekRule utilizzato.The following code example shows how the result of GetWeekOfYear varies depending on the FirstDayOfWeek and the CalendarWeekRule used. Se la data specificata è l'ultimo giorno dell'anno, GetWeekOfYear restituisce il numero totale di settimane nell'anno.If the specified date is the last day of the year, GetWeekOfYear returns the total number of weeks in that year.

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).

Commenti

Questo metodo può essere utilizzato per determinare il numero di settimane nell'anno impostando time sull'ultimo giorno dell'anno.This method can be used to determine the number of weeks in the year by setting time to the last day of the year.

L'oggetto DateTimeFormatInfo per determinate impostazioni cultura che usano il calendario indicato dalla proprietà DateTimeFormatInfo.Calendar include i valori specifici delle impostazioni cultura seguenti che possono essere usati per i parametri rule e firstDayOfWeek:The DateTimeFormatInfo object for a particular culture that uses the calendar indicated by the DateTimeFormatInfo.Calendar property includes the following culture-specific values that can be used for the rule and firstDayOfWeek parameters:

Nell'esempio seguente viene utilizzato l'oggetto DateTimeFormatInfo delle impostazioni cultura correnti per determinare che il 1 ° gennaio 2011 è nella prima settimana dell'anno nel calendario gregoriano.The following example uses the current culture's DateTimeFormatInfo object to determine that January 1, 2011 is in the first week of the year in the Gregorian calendar.

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)

Per alcuni calendari, una chiamata al metodo GetWeekOfYear genera un'ArgumentOutOfRangeException per determinate combinazioni di valori di rule e firstDayOfWeek anche se time è maggiore della data restituita dalla proprietà MinSupportedDateTime del calendario.For some calendars, a call to the GetWeekOfYear method throws an ArgumentOutOfRangeException for particular combinations of rule and firstDayOfWeek values even if time is greater than the date returned by that calendar's MinSupportedDateTime property. Nella tabella seguente sono elencati i calendari interessati, i valori rule specifici e l'intervallo dei valori di time supportati più recenti.The following table lists the affected calendars, the specific rule values, and the range of the earliest supported time values. Il valore di DateTime minimo specifico dipende dal valore del parametro firstDayOfWeek.The specific minimum DateTime value depends on the value of the firstDayOfWeek parameter.

CalendarCalendar Valore CalendarWeekRuleCalendarWeekRule value Data gregoriano (M/gg/aaaa)Gregorian date (M/dd/yyyy) Data nel calendario (M/gg/aaaa)Date in calendar (M/dd/yyyy)
ChineseLunisolarCalendar FirstFullWeek da 2/19/1901 a 2/25/19012/19/1901 to 2/25/1901 da 1/1/1901 a 1/7/19011/1/1901 to 1/7/1901
ChineseLunisolarCalendar FirstFourDayWeek da 2/19/1901 a 2/22/19012/19/1901 to 2/22/1901 da 1/01/1901 a 1/04/19011/01/1901 to 1/04/1901
HebrewCalendar FirstDay 9/17/15839/17/1583 1/01/53441/01/5344
HebrewCalendar FirstFullWeek da 9/17/1583 a 9/23/15839/17/1583 to 9/23/1583 da 1/01/5344 a 1/07/53441/01/5344 to 1/07/5344
HebrewCalendar FirstFourDayWeek da 9/17/1583 a 9/20/15839/17/1583 to 9/20/1583 da 1/01/5344 a 1/04/53441/01/5344 to 1/04/5344
HijriCalendar FirstFullWeek da 7/18/0622 a 7/24/06227/18/0622 to 7/24/0622 da 1/01/0001 a 1/07/00011/01/0001 to 1/07/0001
HijriCalendar FirstFourDayWeek da 7/18/0622 a 7/21/06227/18/0622 to 7/21/0622 da 1/01/0001 a 1/04/00011/01/0001 to 1/04/0001
JapaneseLunisolarCalendar FirstFullWeek da 1/28/1960 a 2/03/19601/28/1960 to 2/03/1960 da 1/01/35 a 1/07/00351/01/35 to 1/07/0035
JapaneseLunisolarCalendar FirstFourDayWeek da 1/28/1960 a 1/31/19601/28/1960 to 1/31/1960 da 1/01/0035 a 1/04/00351/01/0035 to 1/04/0035
JulianCalendar FirstFullWeek da 1/01/0001 a 1/05/00011/01/0001 to 1/05/0001 da 1/03/0001 a 1/07/00011/03/0001 to 1/07/0001
JulianCalendar FirstFourDayWeek da 1/01/0001 a 1/02/00011/01/0001 to 1/02/0001 da 1/03/0001 a 1/04/00011/03/0001 to 1/04/0001
KoreanLunisolarCalendar FirstFullWeek da 2/14/0918 a 2/20/09182/14/0918 to 2/20/0918 da 1/01/0918 a 1/07/09181/01/0918 to 1/07/0918
KoreanLunisolarCalendar FirstFourDayWeek da 2/14/0918 a 2/17/09182/14/0918 to 2/17/0918 da 1/01/0918 a 1/04/09181/01/0918 to 1/04/0918
PersianCalendar FirstFullWeek da 3/21/0622 a 3/27/06223/21/0622 to 3/27/0622 da 1/01/0001 a 1/07/00011/01/0001 to 1/07/0001
PersianCalendar FirstFourDayWeek da 3/21/0622 a 3/24/06223/21/0622 to 3/24/0622 da 1/01/0001 a 1/04/00011/01/0001 to 1/04/0001
TaiwanLunisolarCalendar FirstFullWeek da 2/18/1912 a 2/24/19122/18/1912 to 2/24/1912 da 1/01/0001 a 1/07/00011/01/0001 to 1/07/0001
TaiwanLunisolarCalendar FirstFourDayWeek da 2/18/1912 a 2/21/19122/18/1912 to 2/21/1912 da 1/01/0001 a 1/04/00011/01/0001 to 1/04/0001
UmAlQuraCalendar FirstFullWeek da 4/30/1900 a 5/06/19004/30/1900 to 5/06/1900 da 1/01/1318 a 1/07/13181/01/1318 to 1/07/1318
UmAlQuraCalendar FirstFourDayWeek da 4/30/1900 a 5/03/19004/30/1900 to 5/03/1900 da 1/01/1318 a 1/04/13181/01/1318 to 1/04/1318

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