DateTimeFormatInfo.GetEra(String) 方法
定义
重要
一些信息与预发行产品相关，相应产品在发行之前可能会进行重大修改。 对于此处提供的信息，Microsoft 不作任何明示或暗示的担保。
返回表示指定纪元的整数。
public:
int GetEra(System::String ^ eraName);public int GetEra(string eraName);member this.GetEra : string -> intPublic Function GetEra (eraName As String) As Integer参数
- eraName
- String
包含纪元名称的字符串。
返回
表示纪元的整数（如果 eraName 有效）;否则为 -1。
例外
eraName 是 null。
示例
以下示例显示 DateTimeFormatInfo ，仅当日历为公历且区域性使用纪元名称“A.D.”时，才会忽略纪元名称中的标点符号。
using System;
using System.Globalization;
public class SamplesGregorianCalendar {
public static void Main() {
// Creates strings with punctuation and without.
String strADPunc = "A.D.";
String strADNoPunc = "AD";
String strCEPunc = "C.E.";
String strCENoPunc = "CE";
// Calls DTFI.GetEra for each culture that uses GregorianCalendar as the default calendar.
Console.WriteLine( " ----- AD ----- ----- CE -----" );
Console.WriteLine( "CULTURE PUNC NO PUNC PUNC NO PUNC CALENDAR" );
foreach ( CultureInfo myCI in CultureInfo.GetCultures( CultureTypes.SpecificCultures ) ) {
Console.Write( "{0,-12}", myCI );
Console.Write( "{0,-7}{1,-9}", myCI.DateTimeFormat.GetEra( strADPunc ), myCI.DateTimeFormat.GetEra( strADNoPunc ) );
Console.Write( "{0,-7}{1,-9}", myCI.DateTimeFormat.GetEra( strCEPunc ), myCI.DateTimeFormat.GetEra( strCENoPunc ) );
Console.Write( "{0}", myCI.Calendar );
Console.WriteLine();
}
}
}
/*
This code produces the following output. This output has been cropped for brevity.
----- AD ----- ----- CE -----
CULTURE PUNC NO PUNC PUNC NO PUNC CALENDAR
ar-SA -1 -1 -1 -1 System.Globalization.HijriCalendar
ar-IQ 1 1 -1 -1 System.Globalization.GregorianCalendar
ar-EG 1 1 -1 -1 System.Globalization.GregorianCalendar
ar-LY 1 1 -1 -1 System.Globalization.GregorianCalendar
ar-DZ 1 1 -1 -1 System.Globalization.GregorianCalendar
ar-MA 1 1 -1 -1 System.Globalization.GregorianCalendar
ar-TN 1 1 -1 -1 System.Globalization.GregorianCalendar
ar-OM 1 1 -1 -1 System.Globalization.GregorianCalendar
ar-YE 1 1 -1 -1 System.Globalization.GregorianCalendar
ar-SY 1 1 -1 -1 System.Globalization.GregorianCalendar
ar-JO 1 1 -1 -1 System.Globalization.GregorianCalendar
ar-LB 1 1 -1 -1 System.Globalization.GregorianCalendar
ar-KW 1 1 -1 -1 System.Globalization.GregorianCalendar
ar-AE 1 1 -1 -1 System.Globalization.GregorianCalendar
ar-BH 1 1 -1 -1 System.Globalization.GregorianCalendar
ar-QA 1 1 -1 -1 System.Globalization.GregorianCalendar
bg-BG 1 1 -1 -1 System.Globalization.GregorianCalendar
ca-ES -1 -1 -1 -1 System.Globalization.GregorianCalendar
zh-TW -1 -1 -1 -1 System.Globalization.GregorianCalendar
zh-CN -1 -1 -1 -1 System.Globalization.GregorianCalendar
zh-HK -1 -1 -1 -1 System.Globalization.GregorianCalendar
zh-SG 1 1 -1 -1 System.Globalization.GregorianCalendar
zh-MO 1 1 -1 -1 System.Globalization.GregorianCalendar
cs-CZ -1 -1 -1 -1 System.Globalization.GregorianCalendar
da-DK 1 1 -1 -1 System.Globalization.GregorianCalendar
*/
Imports System.Globalization
Public Class SamplesGregorianCalendar
Public Shared Sub Main()
' Creates strings with punctuation and without.
Dim strADPunc As [String] = "A.D."
Dim strADNoPunc As [String] = "AD"
Dim strCEPunc As [String] = "C.E."
Dim strCENoPunc As [String] = "CE"
' Calls DTFI.GetEra for each culture that uses GregorianCalendar as the default calendar.
Console.WriteLine(" ----- AD ----- ----- CE -----")
Console.WriteLine("CULTURE PUNC NO PUNC PUNC NO PUNC CALENDAR")
Dim myCI As CultureInfo
For Each myCI In CultureInfo.GetCultures(CultureTypes.SpecificCultures)
Console.Write("{0,-12}", myCI)
Console.Write("{0,-7}{1,-9}", myCI.DateTimeFormat.GetEra(strADPunc), myCI.DateTimeFormat.GetEra(strADNoPunc))
Console.Write("{0,-7}{1,-9}", myCI.DateTimeFormat.GetEra(strCEPunc), myCI.DateTimeFormat.GetEra(strCENoPunc))
Console.Write("{0}", myCI.Calendar)
Console.WriteLine()
Next myCI
End Sub
End Class
'This code produces the following output. This output has been cropped for brevity.
'
' ----- AD ----- ----- CE -----
'CULTURE PUNC NO PUNC PUNC NO PUNC CALENDAR
'ar-SA -1 -1 -1 -1 System.Globalization.HijriCalendar
'ar-IQ 1 1 -1 -1 System.Globalization.GregorianCalendar
'ar-EG 1 1 -1 -1 System.Globalization.GregorianCalendar
'ar-LY 1 1 -1 -1 System.Globalization.GregorianCalendar
'ar-DZ 1 1 -1 -1 System.Globalization.GregorianCalendar
'ar-MA 1 1 -1 -1 System.Globalization.GregorianCalendar
'ar-TN 1 1 -1 -1 System.Globalization.GregorianCalendar
'ar-OM 1 1 -1 -1 System.Globalization.GregorianCalendar
'ar-YE 1 1 -1 -1 System.Globalization.GregorianCalendar
'ar-SY 1 1 -1 -1 System.Globalization.GregorianCalendar
'ar-JO 1 1 -1 -1 System.Globalization.GregorianCalendar
'ar-LB 1 1 -1 -1 System.Globalization.GregorianCalendar
'ar-KW 1 1 -1 -1 System.Globalization.GregorianCalendar
'ar-AE 1 1 -1 -1 System.Globalization.GregorianCalendar
'ar-BH 1 1 -1 -1 System.Globalization.GregorianCalendar
'ar-QA 1 1 -1 -1 System.Globalization.GregorianCalendar
'bg-BG 1 1 -1 -1 System.Globalization.GregorianCalendar
'ca-ES -1 -1 -1 -1 System.Globalization.GregorianCalendar
'zh-TW -1 -1 -1 -1 System.Globalization.GregorianCalendar
'zh-CN -1 -1 -1 -1 System.Globalization.GregorianCalendar
'zh-HK -1 -1 -1 -1 System.Globalization.GregorianCalendar
'zh-SG 1 1 -1 -1 System.Globalization.GregorianCalendar
'zh-MO 1 1 -1 -1 System.Globalization.GregorianCalendar
'cs-CZ -1 -1 -1 -1 System.Globalization.GregorianCalendar
'da-DK 1 1 -1 -1 System.Globalization.GregorianCalendar
注解
纪元名称是日历用来引用从固定点或事件算起的时间段的名称。 例如，“A.D.”或“C.E.”是公历中的当前纪元。
与 eraName 不区分大小写的比较，例如，“A.D.”等效于“a.d.”。
GetEra 忽略缩写纪元名称中的标点符号，仅当 GregorianCalendar 选定时 DateTimeFormatInfo.Calendar ，区域性才使用“A.D.”作为纪元名称，即“A.D”。等效于“AD”。
GetEra
eraName与返回的GetEraName全纪元名称以及返回的GetAbbreviatedEraName缩写纪元名称进行比较。
Important
日本日历中的纪元基于皇帝的统治，因此预计将改变。 例如，2019 年 5 月 1 日在 JapaneseCalendar 和 JapaneseLunisolarCalendar 中标志着令和年号的开始。 这种时代变化会影响使用这些日历的所有应用程序。 有关详细信息以及确定您的应用程序是否受到影响，请参阅 在 .NET 中处理日语日历的新纪元。 有关在 Windows 系统上测试应用程序以确保其为纪元更改做好准备的信息，请参阅 为日本时代更改准备应用程序。 有关支持具有多个纪元的日历以及处理支持多个纪元的日历的最佳做法的 .NET 中的功能，请参阅 “使用纪元”。