Calendar.GetWeekOfYear(DateTime, CalendarWeekRule, DayOfWeek) Metoda

Definicja

Przestrzeń nazw:

System.Globalization

Zestaw:

System.Runtime.dll

Źródło:

Calendar.cs

Zwraca tydzień roku, który zawiera datę w określonej DateTime wartości.

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

Parametry

time

DateTime

Wartość daty i godziny.

rule

CalendarWeekRule

Wartość wyliczenia, która definiuje tydzień kalendarzowy.

firstDayOfWeek

DayOfWeek

Wartość wyliczenia reprezentująca pierwszy dzień tygodnia.

Zwraca

Int32

Dodatnia liczba całkowita reprezentująca tydzień roku, który zawiera datę w parametrze time .

Wyjątki

ArgumentOutOfRangeException

time jest wcześniejsza niż MinSupportedDateTime lub nowsza niż MaxSupportedDateTime.

-lub-

firstDayOfWeek jest nieprawidłową DayOfWeek wartością.

-lub-

rule jest nieprawidłową CalendarWeekRule wartością.

Przykłady

Poniższy przykład kodu pokazuje, jak wynik GetWeekOfYear różni się w zależności od używanego FirstDayOfWeekCalendarWeekRule obiektu i . Jeśli określona data to ostatni dzień roku, GetWeekOfYear zwraca łączną liczbę tygodni w tym roku.

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).

Uwagi

Ta metoda może służyć do określenia liczby tygodni w roku przez ustawienie time ostatniego dnia roku.

DateTimeFormatInfo Obiekt dla określonej kultury, która używa kalendarza wskazanego DateTimeFormatInfo.Calendar przez właściwość, zawiera następujące wartości specyficzne dla kultury, które mogą być używane dla rule parametrów ifirstDayOfWeek:

• Właściwość DateTimeFormatInfo.FirstDayOfWeek zawiera domyślny pierwszy dzień tygodnia, którego można użyć dla parametru firstDayOfWeek .

• Właściwość DateTimeFormatInfo.CalendarWeekRule zawiera domyślną regułę tygodnia kalendarzowego, która może być używana dla parametru rule .

Uwaga

Nie jest to dokładnie mapowe na iso 8601. Różnice zostały omówione we wpisie w blogu w formacie ISO 8601 Week of Year w programie Microsoft .NET. Począwszy od platformy .NET Core 3.0 i ISOWeek.GetYearISOWeek.GetWeekOfYear rozwiąż ten problem.

W poniższym przykładzie użyto obiektu bieżącej kultury DateTimeFormatInfo , aby określić, że 1 stycznia 2011 r. znajduje się w pierwszym tygodniu roku w kalendarzu gregoriańskim.

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)

W przypadku niektórych kalendarzy wywołanie GetWeekOfYear metody zwraca ArgumentOutOfRangeException wartość dla określonych kombinacji rule wartości, firstDayOfWeek nawet jeśli time jest większa niż data zwrócona MinSupportedDateTime przez właściwość tego kalendarza. W poniższej tabeli wymieniono kalendarze, których dotyczy problem, określone rule wartości i zakres najwcześniejszych obsługiwanych time wartości. Określona wartość minimalna DateTime zależy od wartości parametru firstDayOfWeek .

Kalendarz	Wartość CalendarWeekRule	Data gregoriańskiego (M/dd/rrrr)	Data w kalendarzu (M/dd/rrrr)
ChineseLunisolarCalendar	FirstFullWeek	2/19/1901 do 2/25/1901	1/1/1901 do 1/7/1901
ChineseLunisolarCalendar	FirstFourDayWeek	2/19/1901 do 2/22/1901	1/01/1901 do 1/04/1901
HebrewCalendar	FirstDay	9/17/1583	1/01/5344
HebrewCalendar	FirstFullWeek	9/17/1583 do 9/23/1583	1/01/5344 do 1/07/5344
HebrewCalendar	FirstFourDayWeek	9/17/1583 do 9/20/1583	1/01/5344 do 1/04/5344
HijriCalendar	FirstFullWeek	7/18/0622 do 7/24/0622	1/01/0001 do 1/07/0001
HijriCalendar	FirstFourDayWeek	7/18/0622 do 7/21/0622	1/01/0001 do 1/04/0001
JapaneseLunisolarCalendar	FirstFullWeek	1/28/1960 do 2/03/1960	1/01/35 do 1/07/0035
JapaneseLunisolarCalendar	FirstFourDayWeek	1/28/1960 do 1/31/1960	1/01/0035 do 1/04/0035
JulianCalendar	FirstFullWeek	1/01/0001 do 1/05/0001	1/03/0001 do 1/07/0001
JulianCalendar	FirstFourDayWeek	1/01/0001 do 1/02/0001	1/03/0001 do 1/04/0001
KoreanLunisolarCalendar	FirstFullWeek	2/14/0918 do 2/20/0918	1/01/0918 do 1/07/0918
KoreanLunisolarCalendar	FirstFourDayWeek	2/14/0918 do 2/17/0918	1/01/0918 do 1/04/0918
PersianCalendar	FirstFullWeek	3/21/0622 do 3/27/0622	1/01/0001 do 1/07/0001
PersianCalendar	FirstFourDayWeek	3/21/0622 do 3/24/0622	1/01/0001 do 1/04/0001
TaiwanLunisolarCalendar	FirstFullWeek	2/18/1912 do 2/24/1912	1/01/0001 do 1/07/0001
TaiwanLunisolarCalendar	FirstFourDayWeek	2/18/1912 do 2/21/1912	1/01/0001 do 1/04/0001
UmAlQuraCalendar	FirstFullWeek	4/30/1900 do 5/06/1900	1/01/1318 do 1/07/1318
UmAlQuraCalendar	FirstFourDayWeek	4/30/1900 do 5/03/1900	1/01/1318 do 1/04/1318

Zobacz też

• DateTime
• CalendarWeekRule
• DayOfWeek
• GetEra(DateTime)
• GetYear(DateTime)
• GetMonth(DateTime)
• GetDayOfYear(DateTime)
• GetDayOfMonth(DateTime)
• GetDayOfWeek(DateTime)
• GetHour(DateTime)
• GetMinute(DateTime)
• GetSecond(DateTime)
• GetMilliseconds(DateTime)