Calendar.GetWeekOfYear(DateTime, CalendarWeekRule, DayOfWeek) Calendar.GetWeekOfYear(DateTime, CalendarWeekRule, DayOfWeek) Calendar.GetWeekOfYear(DateTime, CalendarWeekRule, DayOfWeek) Calendar.GetWeekOfYear(DateTime, CalendarWeekRule, DayOfWeek) Method

定義

傳回年份中的週,其中包含指定之 DateTime 值中的日期。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

參數

time
DateTime DateTime DateTime DateTime

日期和時間值。A date and time value.

rule
CalendarWeekRule CalendarWeekRule CalendarWeekRule CalendarWeekRule

定義日曆週的列舉值。An enumeration value that defines a calendar week.

firstDayOfWeek
DayOfWeek DayOfWeek DayOfWeek DayOfWeek

表示一週第一天的列舉值。An enumeration value that represents the first day of the week.

傳回

正整數,表示 time 參數中日期所屬年份中的某週。A positive integer that represents the week of the year that includes the date in the time parameter.

例外狀況

time 早於 MinSupportedDateTime 或晚於 MaxSupportedDateTimetime is earlier than MinSupportedDateTime or later than MaxSupportedDateTime.

-或--or- firstDayOfWeek 不是有效的 DayOfWeek 值。firstDayOfWeek is not a valid DayOfWeek value.

-或--or- rule 不是有效的 CalendarWeekRule 值。rule is not a valid CalendarWeekRule value.

範例

下列程式碼範例示範如何的結果GetWeekOfYear取決於FirstDayOfWeekCalendarWeekRule使用。The following code example shows how the result of GetWeekOfYear varies depending on the FirstDayOfWeek and the CalendarWeekRule used. 如果指定的日期是最後一天的年份,GetWeekOfYear傳回該年份的週數總計。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
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 'Main 
End Class 'SamplesCalendar


'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).

備註

這個方法可用來設定來判斷一年的週數time一年的最後一天。This method can be used to determine the number of weeks in the year by setting time to the last day of the year.

DateTimeFormatInfo物件的特定文化特性會由行事曆DateTimeFormatInfo.Calendar屬性包含下列可用於的特定文化特性值rulefirstDayOfWeek參數: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:

下列範例會使用目前文化特性的DateTimeFormatInfo判斷 2011 年 1 月 1 日是西曆日曆年度的第一週中的物件。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)

針對某些曆法,呼叫GetWeekOfYear方法會擲回ArgumentOutOfRangeException特定組合的rulefirstDayOfWeek值,即使time大於由該曆法的日期MinSupportedDateTime屬性。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. 下表列出受影響的行事曆,特定rule值和最早支援的各種time值。The following table lists the affected calendars, the specific rule values, and the range of the earliest supported time values. 特定的最小DateTime值取決於值firstDayOfWeek參數。The specific minimum DateTime value depends on the value of the firstDayOfWeek parameter.

行事曆Calendar CalendarWeekRule 值CalendarWeekRule value 西曆日期 (M/dd/yyyy)Gregorian date (M/dd/yyyy) 日期的行事曆 (M/dd/yyyy)Date in calendar (M/dd/yyyy)
ChineseLunisolarCalendar FirstFullWeek 2/19/1901 到 2/25/19012/19/1901 to 2/25/1901 以 1901 年 1/7/1/1/19011/1/1901 to 1/7/1901
ChineseLunisolarCalendar FirstFourDayWeek 2/19/1901 到 2/22/19012/19/1901 to 2/22/1901 以 1/04/1901年 1/01/19011/01/1901 to 1/04/1901
HebrewCalendar FirstDay 9/17/15839/17/1583 1/01/53441/01/5344
HebrewCalendar FirstFullWeek 9/17/1583 9/23/1583 到9/17/1583 to 9/23/1583 1/01/5344 以 1/07/53441/01/5344 to 1/07/5344
HebrewCalendar FirstFourDayWeek 9/17/1583 至 9/20/15839/17/1583 to 9/20/1583 1/01/5344 以 1/04/53441/01/5344 to 1/04/5344
HijriCalendar FirstFullWeek 7/18/0622年至 7/24/0622 變更7/18/0622 to 7/24/0622 以 0001 年 1/07/1/01/00011/01/0001 to 1/07/0001
HijriCalendar FirstFourDayWeek 7/18/0622年至 7/21/0622 變更7/18/0622 to 7/21/0622 以 0001 年 1/04/1/01/00011/01/0001 to 1/04/0001
JapaneseLunisolarCalendar FirstFullWeek 1/28/1960 年到 2/03/19601/28/1960 to 2/03/1960 1/01/35 到 1/07/00351/01/35 to 1/07/0035
JapaneseLunisolarCalendar FirstFourDayWeek 1/28/1960 年到 1/31/19601/28/1960 to 1/31/1960 以 1/04/0035 1/01/00351/01/0035 to 1/04/0035
JulianCalendar FirstFullWeek 以 0001 年 1/05/1/01/00011/01/0001 to 1/05/0001 以 0001 年 1/07/1/03/00011/03/0001 to 1/07/0001
JulianCalendar FirstFourDayWeek 以 0001 年 1/02/1/01/00011/01/0001 to 1/02/0001 以 0001 年 1/04/1/03/00011/03/0001 to 1/04/0001
KoreanLunisolarCalendar FirstFullWeek 2/14/0918年到 2/20/09182/14/0918 to 2/20/0918 1/01/0918年以 1/07/09181/01/0918 to 1/07/0918
KoreanLunisolarCalendar FirstFourDayWeek 2/14/0918年到 2/17/09182/14/0918 to 2/17/0918 1/01/0918年以 1/04/09181/01/0918 to 1/04/0918
PersianCalendar FirstFullWeek 3/21/0622年至 3/27/0622 變更3/21/0622 to 3/27/0622 以 0001 年 1/07/1/01/00011/01/0001 to 1/07/0001
PersianCalendar FirstFourDayWeek 3/21/0622年至 3/24/0622 變更3/21/0622 to 3/24/0622 以 0001 年 1/04/1/01/00011/01/0001 to 1/04/0001
TaiwanLunisolarCalendar FirstFullWeek 2/18/1912 年 2/24/19122/18/1912 to 2/24/1912 以 0001 年 1/07/1/01/00011/01/0001 to 1/07/0001
TaiwanLunisolarCalendar FirstFourDayWeek 2/18/1912 年 2/21/19122/18/1912 to 2/21/1912 以 0001 年 1/04/1/01/00011/01/0001 to 1/04/0001
UmAlQuraCalendar FirstFullWeek 4/30/1900 到 1900 年 5 月 06 日4/30/1900 to 5/06/1900 1/01/1318 到 1/07/13181/01/1318 to 1/07/1318
UmAlQuraCalendar FirstFourDayWeek 4/30/1900 到 1900 年 5 月 034/30/1900 to 5/03/1900 1/01/1318 到 1/04/13181/01/1318 to 1/04/1318

適用於

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