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DateTimeFormatInfo.Calendar 屬性

定義

取得或設定目前文化特性所使用的曆法。

public:
 property System::Globalization::Calendar ^ Calendar { System::Globalization::Calendar ^ get(); void set(System::Globalization::Calendar ^ value); };
public System.Globalization.Calendar Calendar { get; set; }
member this.Calendar : System.Globalization.Calendar with get, set
Public Property Calendar As Calendar

屬性值

目前文化特性所使用的曆法。 InvariantInfo 的預設值是 GregorianCalendar 物件。

例外狀況

此屬性設定為 null

屬性正被設定為對目前文化特性而言並非有效的 Calendar 物件。

正在設定屬性,而且 DateTimeFormatInfo 物件為唯讀。

範例

下列範例會 ChangeCalendar 定義方法,除非文化特性已經是目前行事曆,或文化特性不支援,否則會將文化特性的目前行事曆變更為指定的行事曆。 呼叫 方法的程式代碼會具現化 CultureInfo 代表阿拉伯文 (希臘) 文化特性的物件,並先嘗試將其行事曆變更為日曆。 因為不支持日曆,所以方法不會變更文化特性的行事曆。 不過,因為 um al-Qura 行事曆是集合的成員 CultureInfo.OptionalCalendars ,所以方法會成功讓它成為 ar-EG 文化特性的目前行事曆。

using System;
using System.Globalization;

public class Example
{
   public static void Main()
   {
      CultureInfo ci = CultureInfo.CreateSpecificCulture("ar-EG");
      Console.WriteLine("The current calendar for the {0} culture is {1}",
                        ci.Name,
                        CalendarUtilities.ShowCalendarName(ci.DateTimeFormat.Calendar));

      CalendarUtilities.ChangeCalendar(ci, new JapaneseCalendar());
      Console.WriteLine("The current calendar for the {0} culture is {1}",
                        ci.Name,
                        CalendarUtilities.ShowCalendarName(ci.DateTimeFormat.Calendar));

      CalendarUtilities.ChangeCalendar(ci, new UmAlQuraCalendar());
      Console.WriteLine("The current calendar for the {0} culture is {1}",
                        ci.Name,
                        CalendarUtilities.ShowCalendarName(ci.DateTimeFormat.Calendar));
   }
}

public class CalendarUtilities
{
   private Calendar newCal;
   private bool isGregorian;

   public static void ChangeCalendar(CultureInfo ci, Calendar cal)
   {
      CalendarUtilities util = new CalendarUtilities(cal);

      // Is the new calendar already the current calendar?
      if (util.CalendarExists(ci.DateTimeFormat.Calendar))
         return;

      // Is the new calendar supported?
      if (Array.Exists(ci.OptionalCalendars, util.CalendarExists))
         ci.DateTimeFormat.Calendar = cal;
   }

   private CalendarUtilities(Calendar cal)
   {
      newCal = cal;

      // Is the new calendar a Gregorian calendar?
      isGregorian = cal.GetType().Name.Contains("Gregorian");
   }

   private bool CalendarExists(Calendar cal)
   {
      if (cal.ToString() == newCal.ToString()) {
         if (isGregorian) {
            if (((GregorianCalendar) cal).CalendarType ==
               ((GregorianCalendar) newCal).CalendarType)
               return true;
         }
         else {
            return true;
         }
      }
      return false;
   }

   public static string ShowCalendarName(Calendar cal)
   {
      string calName = cal.ToString().Replace("System.Globalization.", "");
      if (cal is GregorianCalendar)
         calName += ", Type " + ((GregorianCalendar) cal).CalendarType.ToString();

      return calName;
   }
}
// The example displays the following output:
//    The current calendar for the ar-EG culture is GregorianCalendar, Type Localized
//    The current calendar for the ar-EG culture is GregorianCalendar, Type Localized
//    The current calendar for the ar-EG culture is UmAlQuraCalendar
Imports System.Globalization

Module Example
   Public Sub Main()
      Dim ci As CultureInfo = CultureInfo.CreateSpecificCulture("ar-EG")
      Console.WriteLine("The current calendar for the {0} culture is {1}",
                        ci.Name, 
                        CalendarUtilities.ShowCalendarName(ci.DateTimeFormat.Calendar))

      CalendarUtilities.ChangeCalendar(ci, New JapaneseCalendar())
      Console.WriteLine("The current calendar for the {0} culture is {1}",
                        ci.Name, 
                        CalendarUtilities.ShowCalendarName(ci.DateTimeFormat.Calendar))
      
      CalendarUtilities.ChangeCalendar(ci, New UmAlQuraCalendar())
      Console.WriteLine("The current calendar for the {0} culture is {1}",
                        ci.Name, 
                        CalendarUtilities.ShowCalendarName(ci.DateTimeFormat.Calendar))
   End Sub
End Module

Public Class CalendarUtilities
   Private newCal As Calendar
   Private isGregorian As Boolean
   
   Public Shared Sub ChangeCalendar(ci As CultureInfo, cal As Calendar)
      Dim util As New CalendarUtilities(cal)
      
      ' Is the new calendar already the current calendar?
      If util.CalendarExists(ci.DateTimeFormat.Calendar) Then
         Exit Sub
      End If

      ' Is the new calendar supported?
      If Array.Exists(ci.OptionalCalendars, AddressOf util.CalendarExists) Then
         ci.DateTimeFormat.Calendar = cal
      End If
   End Sub
   
   Private Sub New(cal As Calendar)
      newCal = cal
      
      ' Is the new calendar a Gregorian calendar?
      isGregorian = cal.GetType().Name.Contains("Gregorian")
   End Sub
   
   Private Function CalendarExists(cal As Calendar) As Boolean
      If cal.ToString() = newCal.ToString Then
         If isGregorian Then
            If CType(cal, GregorianCalendar).CalendarType = 
               CType(newCal, GregorianCalendar).CalendarType Then
               Return True
            End If
         Else
            Return True
         End If
      End If
      Return False
   End Function

   Public Shared Function ShowCalendarName(cal As Calendar) As String
      Dim calName As String = cal.ToString().Replace("System.Globalization.", "")
      If TypeOf cal Is GregorianCalendar Then
         calName += ", Type " + CType(cal, GregorianCalendar).CalendarType.ToString()
      End If
      Return calName 
   End Function
End Class
' The example displays the following output:
'    The current calendar for the ar-EG culture is GregorianCalendar, Type Localized
'    The current calendar for the ar-EG culture is GregorianCalendar, Type Localized
'    The current calendar for the ar-EG culture is UmAlQuraCalendar

備註

屬性 Calendar 只接受對與 DateTimeFormatInfo 對象相關聯之文化特性有效的行事曆。 屬性 CultureInfo.OptionalCalendars 會指定特定文化特性可以使用的行事曆,而 CultureInfo.Calendar 屬性會指定文化特性的預設行事曆。

重要

日本曆法的紀元是以天皇的統治為基礎,因此有變更是正常的。 例如,2019 年 5 月 1 日之後,JapaneseCalendarJapaneseLunisolarCalendar 中將開始使用「令和」。 此變更對使用這些日曆的所有應用程式都有影響。 如需詳細資訊,以及判斷您的應用程式是否受到影響,請參閱 在 .NET 的日曆中處理新紀元。 如需在 Windows 系統上測試應用程式以確保其整備時間變更的相關信息,請參閱 準備您的應用程式以進行日文紀元變更。 如需 .NET 中支援多個紀元的行事曆功能,以及使用支援多個紀元的行事歷時的最佳做法,請參閱 使用紀元

變更此屬性的值也會影響下列屬性:MonthNames、、、DayNamesAbbreviatedDayNames、、CalendarWeekRuleFirstDayOfWeekFullDateTimePatternLongDatePatternYearMonthPatternShortDatePattern 和 。MonthDayPatternAbbreviatedMonthNames

例如,如果目前線程的文化特性是日文,這個屬性會接受 JapaneseCalendarLocalizedGregorianCalendarUSEnglishGregorianCalendarJapaneseCalendar使用 時,預設的長日期規範為 “gg y'\x5e74'M'\x6708'd'\x65e5'”。 LocalizedGregorianCalendar使用 時,預設的長日期規範為 “yyyy'\x5e74'M'\x6708'd'\x65e5'”。

適用於

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