DateTimeFormatInfo.GetAllDateTimePatterns 方法
定义
重要
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返回可用于对日期和时间值进行格式设置的标准模式。
重载
| GetAllDateTimePatterns() |
返回可用于对日期和时间值进行格式设置的所有标准模式。 |
| GetAllDateTimePatterns(Char) |
返回可在其中使用指定标准格式字符串对日期和时间值进行格式设置的所有模式。 |
GetAllDateTimePatterns()
- Source:
- DateTimeFormatInfo.cs
- Source:
- DateTimeFormatInfo.cs
- Source:
- DateTimeFormatInfo.cs
返回可用于对日期和时间值进行格式设置的所有标准模式。
public:
cli::array <System::String ^> ^ GetAllDateTimePatterns();public string[] GetAllDateTimePatterns ();member this.GetAllDateTimePatterns : unit -> string[]Public Function GetAllDateTimePatterns () As String()返回
String[]
一个数组，包含可以用于对日期和时间值进行格式设置的标准模式。
示例
以下示例显示固定区域性的日期和时间格式字符串，以及使用该格式字符串设置特定日期格式时生成的结果字符串。
using System;
using System.Globalization;
public class Example
{
public static void Main()
{
DateTime date = new DateTime(2014, 8, 28, 12, 28, 30);
DateTimeFormatInfo invDTF = new DateTimeFormatInfo();
String[] formats = invDTF.GetAllDateTimePatterns();
Console.WriteLine("{0,-40} {1}\n", "Pattern", "Result String");
foreach (var fmt in formats)
Console.WriteLine("{0,-40} {1}", fmt, date.ToString(fmt));
}
}
// The example displays the following output:
// Pattern Result String
//
// MM/dd/yyyy 08/28/2014
// yyyy-MM-dd 2014-08-28
// dddd, dd MMMM yyyy Thursday, 28 August 2014
// dddd, dd MMMM yyyy HH:mm Thursday, 28 August 2014 12:28
// dddd, dd MMMM yyyy hh:mm tt Thursday, 28 August 2014 12:28 PM
// dddd, dd MMMM yyyy H:mm Thursday, 28 August 2014 12:28
// dddd, dd MMMM yyyy h:mm tt Thursday, 28 August 2014 12:28 PM
// dddd, dd MMMM yyyy HH:mm:ss Thursday, 28 August 2014 12:28:30
// MM/dd/yyyy HH:mm 08/28/2014 12:28
// MM/dd/yyyy hh:mm tt 08/28/2014 12:28 PM
// MM/dd/yyyy H:mm 08/28/2014 12:28
// MM/dd/yyyy h:mm tt 08/28/2014 12:28 PM
// yyyy-MM-dd HH:mm 2014-08-28 12:28
// yyyy-MM-dd hh:mm tt 2014-08-28 12:28 PM
// yyyy-MM-dd H:mm 2014-08-28 12:28
// yyyy-MM-dd h:mm tt 2014-08-28 12:28 PM
// MM/dd/yyyy HH:mm:ss 08/28/2014 12:28:30
// yyyy-MM-dd HH:mm:ss 2014-08-28 12:28:30
// MMMM dd August 28
// MMMM dd August 28
// yyyy'-'MM'-'dd'T'HH':'mm':'ss.fffffffK 2014-08-28T12:28:30.0000000
// yyyy'-'MM'-'dd'T'HH':'mm':'ss.fffffffK 2014-08-28T12:28:30.0000000
// ddd, dd MMM yyyy HH':'mm':'ss 'GMT' Thu, 28 Aug 2014 12:28:30 GMT
// ddd, dd MMM yyyy HH':'mm':'ss 'GMT' Thu, 28 Aug 2014 12:28:30 GMT
// yyyy'-'MM'-'dd'T'HH':'mm':'ss 2014-08-28T12:28:30
// HH:mm 12:28
// hh:mm tt 12:28 PM
// H:mm 12:28
// h:mm tt 12:28 PM
// HH:mm:ss 12:28:30
// yyyy'-'MM'-'dd HH':'mm':'ss'Z' 2014-08-28 12:28:30Z
// dddd, dd MMMM yyyy HH:mm:ss Thursday, 28 August 2014 12:28:30
// yyyy MMMM 2014 August
// yyyy MMMM 2014 August
Imports System.Globalization
Module Example
Public Sub Main()
Dim date1 As Date = #08/28/2014 12:28:30PM#
Dim invDTF As New DateTimeFormatInfo()
Dim formats() As String = invDTF.GetAllDateTimePatterns()
Console.WriteLine("{0,-40} {1}", "Pattern", "Result String")
Console.WriteLine()
For Each fmt In formats
Console.WriteLine("{0,-40} {1}", fmt, date1.ToString(fmt))
Next
End Sub
End Module
' The example displays the following output:
' Pattern Result String
'
' MM/dd/yyyy 08/28/2014
' yyyy-MM-dd 2014-08-28
' dddd, dd MMMM yyyy Thursday, 28 August 2014
' dddd, dd MMMM yyyy HH:mm Thursday, 28 August 2014 12:28
' dddd, dd MMMM yyyy hh:mm tt Thursday, 28 August 2014 12:28 PM
' dddd, dd MMMM yyyy H:mm Thursday, 28 August 2014 12:28
' dddd, dd MMMM yyyy h:mm tt Thursday, 28 August 2014 12:28 PM
' dddd, dd MMMM yyyy HH:mm:ss Thursday, 28 August 2014 12:28:30
' MM/dd/yyyy HH:mm 08/28/2014 12:28
' MM/dd/yyyy hh:mm tt 08/28/2014 12:28 PM
' MM/dd/yyyy H:mm 08/28/2014 12:28
' MM/dd/yyyy h:mm tt 08/28/2014 12:28 PM
' yyyy-MM-dd HH:mm 2014-08-28 12:28
' yyyy-MM-dd hh:mm tt 2014-08-28 12:28 PM
' yyyy-MM-dd H:mm 2014-08-28 12:28
' yyyy-MM-dd h:mm tt 2014-08-28 12:28 PM
' MM/dd/yyyy HH:mm:ss 08/28/2014 12:28:30
' yyyy-MM-dd HH:mm:ss 2014-08-28 12:28:30
' MMMM dd August 28
' MMMM dd August 28
' yyyy'-'MM'-'dd'T'HH':'mm':'ss.fffffffK 2014-08-28T12:28:30.0000000
' yyyy'-'MM'-'dd'T'HH':'mm':'ss.fffffffK 2014-08-28T12:28:30.0000000
' ddd, dd MMM yyyy HH':'mm':'ss 'GMT' Thu, 28 Aug 2014 12:28:30 GMT
' ddd, dd MMM yyyy HH':'mm':'ss 'GMT' Thu, 28 Aug 2014 12:28:30 GMT
' yyyy'-'MM'-'dd'T'HH':'mm':'ss 2014-08-28T12:28:30
' HH:mm 12:28
' hh:mm tt 12:28 PM
' H:mm 12:28
' h:mm tt 12:28 PM
' HH:mm:ss 12:28:30
' yyyy'-'MM'-'dd HH':'mm':'ss'Z' 2014-08-28 12:28:30Z
' dddd, dd MMMM yyyy HH:mm:ss Thursday, 28 August 2014 12:28:30
' yyyy MMMM 2014 August
' yyyy MMMM 2014 August
该示例通过调用 构造函数实例化表示 DateTimeFormatInfo 固定区域性的 DateTimeFormatInfo 对象。 它还可以从 属性检索 DateTimeFormatInfo 表示固定区域性的 InvariantInfo 。
注解
此方法返回一个数组，其中包含与标准格式字符串对应的所有自定义格式字符串。 有关 标准格式字符串 的列表，请参阅标准日期和时间格式字符串。
可以在格式化操作中使用 方法返回 GetAllDateTimePatterns 的数组中的自定义格式字符串。 但是，如果这样做，则无法始终通过 Parse 和 TryParse 方法成功分析该格式设置操作中返回的日期和时间值的字符串表示形式。 因此，不能假定 方法返回 GetAllDateTimePatterns 的自定义格式字符串可用于往返日期和时间值。 以下示例阐释了此问题。 它检索一个 DateTimeFormatInfo 对象，该对象包含意大利 (意大利) 区域性的格式设置信息。 它将 方法DateTime.ToString(String)返回GetAllDateTimePatterns()的数组中的每个自定义格式字符串传递给 方法，以创建日期和时间的字符串表示形式。 然后，此示例尝试通过调用 DateTime.TryParse(String, DateTime) 方法来分析此值。 如示例输出所示，某些自定义格式字符串不会生成成功往返的日期和时间值。
using System;
using System.Globalization;
public class Example
{
public static void Main()
{
CultureInfo culture = CultureInfo.CreateSpecificCulture("it-IT");
DateTime date1 = new DateTime(2011, 02, 01, 7, 30, 45, 0);
DateTime date2;
int total = 0;
int noRoundTrip = 0;
foreach (var fmt in culture.DateTimeFormat.GetAllDateTimePatterns()) {
total += 1;
if (! DateTime.TryParse(date1.ToString(fmt), out date2)) {
noRoundTrip++;
Console.WriteLine("Unable to parse {0:" + fmt + "} (format '{1}')",
date1, fmt);
}
}
Console.WriteLine("\nUnable to round-trip {0} of {1} format strings.",
noRoundTrip, total);
}
}
// The example displays the following output:
// Unable to parse Tuesday 1 February 2011 7.30 (format 'dddd d MMMM yyyy H.mm')
// Unable to parse Tuesday 1 February 2011 07.30 (format 'dddd d MMMM yyyy HH.mm')
// Unable to parse 1-Feb-11 7.30 (format 'd-MMM-yy H.mm')
// Unable to parse 1-Feb-11 07.30 (format 'd-MMM-yy HH.mm')
// Unable to parse 1 February 2011 7.30 (format 'd MMMM yyyy H.mm')
// Unable to parse 1 February 2011 07.30 (format 'd MMMM yyyy HH.mm')
// Unable to parse Tuesday 1 February 2011 7.30.45 (format 'dddd d MMMM yyyy H.mm.ss')
// Unable to parse Tuesday 1 February 2011 07.30.45 (format 'dddd d MMMM yyyy HH.mm.ss')
// Unable to parse 1-Feb-11 7.30.45 (format 'd-MMM-yy H.mm.ss')
// Unable to parse 1-Feb-11 07.30.45 (format 'd-MMM-yy HH.mm.ss')
// Unable to parse 1 February 2011 7.30.45 (format 'd MMMM yyyy H.mm.ss')
// Unable to parse 1 February 2011 07.30.45 (format 'd MMMM yyyy HH.mm.ss')
// Unable to parse 01/02/2011 7.30 (format 'dd/MM/yyyy H.mm')
// Unable to parse 01/02/2011 07.30 (format 'dd/MM/yyyy HH.mm')
// Unable to parse 01/Feb/2011 7.30 (format 'dd/MMM/yyyy H.mm')
// Unable to parse 01/Feb/2011 07.30 (format 'dd/MMM/yyyy HH.mm')
// Unable to parse 01/02/11 7.30 (format 'dd/MM/yy H.mm')
// Unable to parse 01/02/11 07.30 (format 'dd/MM/yy HH.mm')
// Unable to parse 01.2.11 7.30 (format 'dd.M.yy H.mm')
// Unable to parse 01.2.11 07.30 (format 'dd.M.yy HH.mm')
// Unable to parse 1/2/11 7.30 (format 'd/M/yy H.mm')
// Unable to parse 1/2/11 07.30 (format 'd/M/yy HH.mm')
// Unable to parse 2011-02-01 7.30 (format 'yyyy-MM-dd H.mm')
// Unable to parse 2011-02-01 07.30 (format 'yyyy-MM-dd HH.mm')
// Unable to parse 01/02/2011 7.30.45 (format 'dd/MM/yyyy H.mm.ss')
// Unable to parse 01/02/2011 07.30.45 (format 'dd/MM/yyyy HH.mm.ss')
// Unable to parse 01/Feb/2011 7.30.45 (format 'dd/MMM/yyyy H.mm.ss')
// Unable to parse 01/Feb/2011 07.30.45 (format 'dd/MMM/yyyy HH.mm.ss')
// Unable to parse 01/02/11 7.30.45 (format 'dd/MM/yy H.mm.ss')
// Unable to parse 01/02/11 07.30.45 (format 'dd/MM/yy HH.mm.ss')
// Unable to parse 01.2.11 7.30.45 (format 'dd.M.yy H.mm.ss')
// Unable to parse 01.2.11 07.30.45 (format 'dd.M.yy HH.mm.ss')
// Unable to parse 1/2/11 7.30.45 (format 'd/M/yy H.mm.ss')
// Unable to parse 1/2/11 07.30.45 (format 'd/M/yy HH.mm.ss')
// Unable to parse 2011-02-01 7.30.45 (format 'yyyy-MM-dd H.mm.ss')
// Unable to parse 2011-02-01 07.30.45 (format 'yyyy-MM-dd HH.mm.ss')
// Unable to parse Tuesday 1 February 2011 7.30.45 (format 'dddd d MMMM yyyy H.mm.ss')
// Unable to parse Tuesday 1 February 2011 07.30.45 (format 'dddd d MMMM yyyy HH.mm.ss')
// Unable to parse 1-Feb-11 7.30.45 (format 'd-MMM-yy H.mm.ss')
// Unable to parse 1-Feb-11 07.30.45 (format 'd-MMM-yy HH.mm.ss')
// Unable to parse 1 February 2011 7.30.45 (format 'd MMMM yyyy H.mm.ss')
// Unable to parse 1 February 2011 07.30.45 (format 'd MMMM yyyy HH.mm.ss')
//
// Unable to round-trip 42 of 98 format strings.
Imports System.Globalization
Module Example
Public Sub Main()
Dim culture As CultureInfo = CultureInfo.CreateSpecificCulture("it-IT")
Dim date1 = New DateTime(2011, 02, 01, 7, 30, 45, 0)
Dim date2 As DateTime
Dim total, noRoundTrip As Integer
For Each fmt In culture.DateTimeFormat.GetAllDateTimePatterns()
total += 1
If Not DateTime.TryParse(date1.ToString(fmt), date2)
noRoundTrip += 1
Console.WriteLine("Unable to parse {0:" + fmt + "} (format '{1}')",
date1, fmt)
End If
Next
Console.WriteLine()
Console.WriteLine("Unable to round-trip {0} of {1} format strings.",
noRoundTrip, total)
End Sub
End Module
' The example displays the following output:
' Unable to parse Tuesday 1 February 2011 7.30 (format 'dddd d MMMM yyyy H.mm')
' Unable to parse Tuesday 1 February 2011 07.30 (format 'dddd d MMMM yyyy HH.mm')
' Unable to parse 1-Feb-11 7.30 (format 'd-MMM-yy H.mm')
' Unable to parse 1-Feb-11 07.30 (format 'd-MMM-yy HH.mm')
' Unable to parse 1 February 2011 7.30 (format 'd MMMM yyyy H.mm')
' Unable to parse 1 February 2011 07.30 (format 'd MMMM yyyy HH.mm')
' Unable to parse Tuesday 1 February 2011 7.30.45 (format 'dddd d MMMM yyyy H.mm.ss')
' Unable to parse Tuesday 1 February 2011 07.30.45 (format 'dddd d MMMM yyyy HH.mm.ss')
' Unable to parse 1-Feb-11 7.30.45 (format 'd-MMM-yy H.mm.ss')
' Unable to parse 1-Feb-11 07.30.45 (format 'd-MMM-yy HH.mm.ss')
' Unable to parse 1 February 2011 7.30.45 (format 'd MMMM yyyy H.mm.ss')
' Unable to parse 1 February 2011 07.30.45 (format 'd MMMM yyyy HH.mm.ss')
' Unable to parse 01/02/2011 7.30 (format 'dd/MM/yyyy H.mm')
' Unable to parse 01/02/2011 07.30 (format 'dd/MM/yyyy HH.mm')
' Unable to parse 01/Feb/2011 7.30 (format 'dd/MMM/yyyy H.mm')
' Unable to parse 01/Feb/2011 07.30 (format 'dd/MMM/yyyy HH.mm')
' Unable to parse 01/02/11 7.30 (format 'dd/MM/yy H.mm')
' Unable to parse 01/02/11 07.30 (format 'dd/MM/yy HH.mm')
' Unable to parse 01.2.11 7.30 (format 'dd.M.yy H.mm')
' Unable to parse 01.2.11 07.30 (format 'dd.M.yy HH.mm')
' Unable to parse 1/2/11 7.30 (format 'd/M/yy H.mm')
' Unable to parse 1/2/11 07.30 (format 'd/M/yy HH.mm')
' Unable to parse 2011-02-01 7.30 (format 'yyyy-MM-dd H.mm')
' Unable to parse 2011-02-01 07.30 (format 'yyyy-MM-dd HH.mm')
' Unable to parse 01/02/2011 7.30.45 (format 'dd/MM/yyyy H.mm.ss')
' Unable to parse 01/02/2011 07.30.45 (format 'dd/MM/yyyy HH.mm.ss')
' Unable to parse 01/Feb/2011 7.30.45 (format 'dd/MMM/yyyy H.mm.ss')
' Unable to parse 01/Feb/2011 07.30.45 (format 'dd/MMM/yyyy HH.mm.ss')
' Unable to parse 01/02/11 7.30.45 (format 'dd/MM/yy H.mm.ss')
' Unable to parse 01/02/11 07.30.45 (format 'dd/MM/yy HH.mm.ss')
' Unable to parse 01.2.11 7.30.45 (format 'dd.M.yy H.mm.ss')
' Unable to parse 01.2.11 07.30.45 (format 'dd.M.yy HH.mm.ss')
' Unable to parse 1/2/11 7.30.45 (format 'd/M/yy H.mm.ss')
' Unable to parse 1/2/11 07.30.45 (format 'd/M/yy HH.mm.ss')
' Unable to parse 2011-02-01 7.30.45 (format 'yyyy-MM-dd H.mm.ss')
' Unable to parse 2011-02-01 07.30.45 (format 'yyyy-MM-dd HH.mm.ss')
' Unable to parse Tuesday 1 February 2011 7.30.45 (format 'dddd d MMMM yyyy H.mm.ss')
' Unable to parse Tuesday 1 February 2011 07.30.45 (format 'dddd d MMMM yyyy HH.mm.ss')
' Unable to parse 1-Feb-11 7.30.45 (format 'd-MMM-yy H.mm.ss')
' Unable to parse 1-Feb-11 07.30.45 (format 'd-MMM-yy HH.mm.ss')
' Unable to parse 1 February 2011 7.30.45 (format 'd MMMM yyyy H.mm.ss')
' Unable to parse 1 February 2011 07.30.45 (format 'd MMMM yyyy HH.mm.ss')
'
' Unable to round-trip 42 of 98 format strings.
若要分析可以用许多预定义自定义格式表示的日期和时间的字符串表示形式，请调用以下方法之一：
DateTime.ParseExact(String, String[], IFormatProvider, DateTimeStyles)
DateTimeOffset.ParseExact(String, String[], IFormatProvider, DateTimeStyles)
DateTime.TryParseExact(String, String[], IFormatProvider, DateTimeStyles, DateTime)
DateTimeOffset.TryParseExact(String, String[], IFormatProvider, DateTimeStyles, DateTimeOffset)
方法返回 GetAllDateTimePatterns 的数组中的自定义格式字符串取决于对象提供格式信息的区域性的 DateTimeFormatInfo 当前日历。 如果日历更改，此方法返回的数组也会更改。
另请参阅
适用于
GetAllDateTimePatterns(Char)
- Source:
- DateTimeFormatInfo.cs
- Source:
- DateTimeFormatInfo.cs
- Source:
- DateTimeFormatInfo.cs
返回可在其中使用指定标准格式字符串对日期和时间值进行格式设置的所有模式。
public:
cli::array <System::String ^> ^ GetAllDateTimePatterns(char format);public string[] GetAllDateTimePatterns (char format);member this.GetAllDateTimePatterns : char -> string[]Public Function GetAllDateTimePatterns (format As Char) As String()参数
- format
- Char
标准格式字符串。
返回
String[]
一个数组，它包含可在其中使用指定格式字符串对日期和时间值进行格式设置的标准模式。
例外
format 不是有效的标准格式字符串。
示例
以下示例显示当前日历的日期和时间模式。
#using <System.dll>
using namespace System;
using namespace System::Globalization;
public ref class SamplesDateTimeFormatInfo
{
public:
static void Main()
{
// Creates a new DateTimeFormatinfo.
DateTimeFormatInfo^ myDtfi = gcnew DateTimeFormatInfo;
// Gets and prints all the patterns
array<String^>^myPatternsArray = myDtfi->GetAllDateTimePatterns();
Console::WriteLine( "ALL the patterns:" );
PrintIndexAndValues( myPatternsArray );
// Gets and prints the pattern(s) associated with some of the format characters.
myPatternsArray = myDtfi->GetAllDateTimePatterns( 'd' );
Console::WriteLine( "The patterns for 'd':" );
PrintIndexAndValues( myPatternsArray );
myPatternsArray = myDtfi->GetAllDateTimePatterns( 'D' );
Console::WriteLine( "The patterns for 'D':" );
PrintIndexAndValues( myPatternsArray );
myPatternsArray = myDtfi->GetAllDateTimePatterns( 'f' );
Console::WriteLine( "The patterns for 'f':" );
PrintIndexAndValues( myPatternsArray );
myPatternsArray = myDtfi->GetAllDateTimePatterns( 'F' );
Console::WriteLine( "The patterns for 'F':" );
PrintIndexAndValues( myPatternsArray );
myPatternsArray = myDtfi->GetAllDateTimePatterns( 'r' );
Console::WriteLine( "The patterns for 'r':" );
PrintIndexAndValues( myPatternsArray );
myPatternsArray = myDtfi->GetAllDateTimePatterns( 'R' );
Console::WriteLine( "The patterns for 'R':" );
PrintIndexAndValues( myPatternsArray );
}
public:
static void PrintIndexAndValues( array<String^>^myArray ) {
int i = 0;
for each ( String^ s in myArray )
Console::WriteLine( "\t[{0}]:\t{1}", i++, s );
Console::WriteLine();
}
};
int main()
{
SamplesDateTimeFormatInfo::Main();
}
/*
This code produces the following output.
ALL the patterns:
[0]: MM/dd/yyyy
[1]: dddd, dd MMMM yyyy
[2]: dddd, dd MMMM yyyy HH:mm
[3]: dddd, dd MMMM yyyy hh:mm tt
[4]: dddd, dd MMMM yyyy H:mm
[5]: dddd, dd MMMM yyyy h:mm tt
[6]: dddd, dd MMMM yyyy HH:mm:ss
[7]: MM/dd/yyyy HH:mm
[8]: MM/dd/yyyy hh:mm tt
[9]: MM/dd/yyyy H:mm
[10]: MM/dd/yyyy h:mm tt
[11]: MM/dd/yyyy HH:mm:ss
[12]: MMMM dd
[13]: MMMM dd
[14]: ddd, dd MMM yyyy HH':'mm':'ss 'GMT'
[15]: ddd, dd MMM yyyy HH':'mm':'ss 'GMT'
[16]: yyyy'-'MM'-'dd'T'HH':'mm':'ss
[17]: HH:mm
[18]: hh:mm tt
[19]: H:mm
[20]: h:mm tt
[21]: HH:mm:ss
[22]: yyyy'-'MM'-'dd HH':'mm':'ss'Z'
[23]: dddd, dd MMMM yyyy HH:mm:ss
[24]: yyyy MMMM
[25]: yyyy MMMM
The patterns for 'd':
[0]: MM/dd/yyyy
The patterns for 'D':
[0]: dddd, dd MMMM yyyy
The patterns for 'f':
[0]: dddd, dd MMMM yyyy HH:mm
[1]: dddd, dd MMMM yyyy hh:mm tt
[2]: dddd, dd MMMM yyyy H:mm
[3]: dddd, dd MMMM yyyy h:mm tt
The patterns for 'F':
[0]: dddd, dd MMMM yyyy HH:mm:ss
The patterns for 'r':
[0]: ddd, dd MMM yyyy HH':'mm':'ss 'GMT'
The patterns for 'R':
[0]: ddd, dd MMM yyyy HH':'mm':'ss 'GMT'
*/
using System;
using System.Globalization;
public class SamplesDateTimeFormatInfo {
public static void Main() {
// Creates a new DateTimeFormatinfo.
DateTimeFormatInfo myDtfi = new DateTimeFormatInfo();
// Gets and prints all the patterns.
String[] myPatternsArray = myDtfi.GetAllDateTimePatterns();
Console.WriteLine( "ALL the patterns:" );
PrintIndexAndValues( myPatternsArray );
// Gets and prints the pattern(s) associated with some of the format characters.
myPatternsArray = myDtfi.GetAllDateTimePatterns('d');
Console.WriteLine( "The patterns for 'd':" );
PrintIndexAndValues( myPatternsArray );
myPatternsArray = myDtfi.GetAllDateTimePatterns('D');
Console.WriteLine( "The patterns for 'D':" );
PrintIndexAndValues( myPatternsArray );
myPatternsArray = myDtfi.GetAllDateTimePatterns('f');
Console.WriteLine( "The patterns for 'f':" );
PrintIndexAndValues( myPatternsArray );
myPatternsArray = myDtfi.GetAllDateTimePatterns('F');
Console.WriteLine( "The patterns for 'F':" );
PrintIndexAndValues( myPatternsArray );
myPatternsArray = myDtfi.GetAllDateTimePatterns('r');
Console.WriteLine( "The patterns for 'r':" );
PrintIndexAndValues( myPatternsArray );
myPatternsArray = myDtfi.GetAllDateTimePatterns('R');
Console.WriteLine( "The patterns for 'R':" );
PrintIndexAndValues( myPatternsArray );
}
public static void PrintIndexAndValues( String[] myArray ) {
int i = 0;
foreach ( string s in myArray )
Console.WriteLine( "\t[{0}]:\t{1}", i++, s );
Console.WriteLine();
}
}
/*
This code produces the following output.
ALL the patterns:
[0]: MM/dd/yyyy
[1]: dddd, dd MMMM yyyy
[2]: dddd, dd MMMM yyyy HH:mm
[3]: dddd, dd MMMM yyyy hh:mm tt
[4]: dddd, dd MMMM yyyy H:mm
[5]: dddd, dd MMMM yyyy h:mm tt
[6]: dddd, dd MMMM yyyy HH:mm:ss
[7]: MM/dd/yyyy HH:mm
[8]: MM/dd/yyyy hh:mm tt
[9]: MM/dd/yyyy H:mm
[10]: MM/dd/yyyy h:mm tt
[11]: MM/dd/yyyy HH:mm:ss
[12]: MMMM dd
[13]: MMMM dd
[14]: ddd, dd MMM yyyy HH':'mm':'ss 'GMT'
[15]: ddd, dd MMM yyyy HH':'mm':'ss 'GMT'
[16]: yyyy'-'MM'-'dd'T'HH':'mm':'ss
[17]: HH:mm
[18]: hh:mm tt
[19]: H:mm
[20]: h:mm tt
[21]: HH:mm:ss
[22]: yyyy'-'MM'-'dd HH':'mm':'ss'Z'
[23]: dddd, dd MMMM yyyy HH:mm:ss
[24]: yyyy MMMM
[25]: yyyy MMMM
The patterns for 'd':
[0]: MM/dd/yyyy
The patterns for 'D':
[0]: dddd, dd MMMM yyyy
The patterns for 'f':
[0]: dddd, dd MMMM yyyy HH:mm
[1]: dddd, dd MMMM yyyy hh:mm tt
[2]: dddd, dd MMMM yyyy H:mm
[3]: dddd, dd MMMM yyyy h:mm tt
The patterns for 'F':
[0]: dddd, dd MMMM yyyy HH:mm:ss
The patterns for 'r':
[0]: ddd, dd MMM yyyy HH':'mm':'ss 'GMT'
The patterns for 'R':
[0]: ddd, dd MMM yyyy HH':'mm':'ss 'GMT'
*/
Imports System.Globalization
Public Class SamplesDateTimeFormatInfo
Public Shared Sub Main()
' Creates a new DateTimeFormatinfo.
Dim myDtfi As New DateTimeFormatInfo()
' Gets and prints all the patterns.
Dim myPatternsArray As String() = myDtfi.GetAllDateTimePatterns()
Console.WriteLine("ALL the patterns:")
PrintIndexAndValues(myPatternsArray)
' Gets and prints the pattern(s) associated with some of the format characters.
myPatternsArray = myDtfi.GetAllDateTimePatterns("d"c)
Console.WriteLine("The patterns for 'd':")
PrintIndexAndValues(myPatternsArray)
myPatternsArray = myDtfi.GetAllDateTimePatterns("D"c)
Console.WriteLine("The patterns for 'D':")
PrintIndexAndValues(myPatternsArray)
myPatternsArray = myDtfi.GetAllDateTimePatterns("f"c)
Console.WriteLine("The patterns for 'f':")
PrintIndexAndValues(myPatternsArray)
myPatternsArray = myDtfi.GetAllDateTimePatterns("F"c)
Console.WriteLine("The patterns for 'F':")
PrintIndexAndValues(myPatternsArray)
myPatternsArray = myDtfi.GetAllDateTimePatterns("r"c)
Console.WriteLine("The patterns for 'r':")
PrintIndexAndValues(myPatternsArray)
myPatternsArray = myDtfi.GetAllDateTimePatterns("R"c)
Console.WriteLine("The patterns for 'R':")
PrintIndexAndValues(myPatternsArray)
End Sub
Public Shared Sub PrintIndexAndValues(myArray() As String)
Dim i As Integer = 0
Dim s As String
For Each s In myArray
Console.WriteLine(ControlChars.Tab + "[{0}]:" + ControlChars.Tab _
+ "{1}", i, s)
i += 1
Next s
Console.WriteLine()
End Sub
End Class
' This code produces the following output.
'
' ALL the patterns:
' [0]: MM/dd/yyyy
' [1]: dddd, dd MMMM yyyy
' [2]: dddd, dd MMMM yyyy HH:mm
' [3]: dddd, dd MMMM yyyy hh:mm tt
' [4]: dddd, dd MMMM yyyy H:mm
' [5]: dddd, dd MMMM yyyy h:mm tt
' [6]: dddd, dd MMMM yyyy HH:mm:ss
' [7]: MM/dd/yyyy HH:mm
' [8]: MM/dd/yyyy hh:mm tt
' [9]: MM/dd/yyyy H:mm
' [10]: MM/dd/yyyy h:mm tt
' [11]: MM/dd/yyyy HH:mm:ss
' [12]: MMMM dd
' [13]: MMMM dd
' [14]: ddd, dd MMM yyyy HH':'mm':'ss 'GMT'
' [15]: ddd, dd MMM yyyy HH':'mm':'ss 'GMT'
' [16]: yyyy'-'MM'-'dd'T'HH':'mm':'ss
' [17]: HH:mm
' [18]: hh:mm tt
' [19]: H:mm
' [20]: h:mm tt
' [21]: HH:mm:ss
' [22]: yyyy'-'MM'-'dd HH':'mm':'ss'Z'
' [23]: dddd, dd MMMM yyyy HH:mm:ss
' [24]: yyyy MMMM
' [25]: yyyy MMMM
'
' The patterns for 'd':
' [0]: MM/dd/yyyy
'
' The patterns for 'D':
' [0]: dddd, dd MMMM yyyy
'
' The patterns for 'f':
' [0]: dddd, dd MMMM yyyy HH:mm
' [1]: dddd, dd MMMM yyyy hh:mm tt
' [2]: dddd, dd MMMM yyyy H:mm
' [3]: dddd, dd MMMM yyyy h:mm tt
'
' The patterns for 'F':
' [0]: dddd, dd MMMM yyyy HH:mm:ss
'
' The patterns for 'r':
' [0]: ddd, dd MMM yyyy HH':'mm':'ss 'GMT'
'
' The patterns for 'R':
' [0]: ddd, dd MMM yyyy HH':'mm':'ss 'GMT'
'
注解
此方法返回一个数组，其中包含对应于特定标准格式字符串的自定义格式字符串。 有关 标准格式字符串 的列表，请参阅标准日期和时间格式字符串。
可以在格式化操作中使用 方法返回 GetAllDateTimePatterns 的数组中的自定义格式字符串。 但是，如果这样做，则无法始终通过 Parse 和 TryParse 方法成功分析该格式设置操作中返回的日期和时间值的字符串表示形式。 因此，不能假定 方法返回 GetAllDateTimePatterns 的自定义格式字符串可用于往返日期和时间值。 以下示例阐释了此问题。 它检索一个 DateTimeFormatInfo 对象，该对象包含俄罗斯 (俄罗斯) 区域性的格式设置信息。 它为每个标准格式字符串调用 GetAllDateTimePatterns(Char) 方法，然后将返回的数组 DateTime.ToString(String) 中的每个自定义格式字符串传递给 方法，以创建日期和时间的字符串表示形式。 然后，此示例尝试通过调用 DateTime.TryParse(String, DateTime) 方法来分析此值。 如示例输出所示，某些自定义格式字符串不会生成成功往返的日期和时间值。
using System;
using System.Globalization;
public class Example
{
public static void Main()
{
CultureInfo culture = CultureInfo.CreateSpecificCulture("ru-RU");
char[] formats = { 'd', 'D', 'f', 'F', 'g', 'G', 'm', 'o',
'r', 's', 't', 'T', 'u', 'U', 'y' };
DateTime date1 = new DateTime(2011, 02, 01, 7, 30, 45, 0);
DateTime date2;
int total = 0;
int noRoundTrip = 0;
foreach (var fmt in formats) {
total = 0;
noRoundTrip = 0;
foreach (var pattern in culture.DateTimeFormat.GetAllDateTimePatterns(fmt)) {
total++;
if (! DateTime.TryParse(date1.ToString(pattern), out date2)) {
noRoundTrip++;
Console.WriteLine("Unable to parse {0:" + pattern + "} (format '{1}')",
date1, pattern);
}
}
if (noRoundTrip > 0)
Console.WriteLine("{0}: Unable to round-trip {1} of {2} format strings.\n",
fmt, noRoundTrip, total);
else
Console.WriteLine("{0}: All custom format strings round trip.\n", fmt);
}
}
}
// The example displays the following output:
// d: All custom format strings round trip.
//
// Unable to parse 1 February 2011 г. (format 'd MMMM yyyy 'г.'')
// Unable to parse 01 February 2011 г. (format 'dd MMMM yyyy 'г.'')
// D: Unable to round-trip 2 of 2 format strings.
//
// Unable to parse 1 February 2011 г. 7:30 (format 'd MMMM yyyy 'г.' H:mm')
// Unable to parse 1 February 2011 г. 07:30 (format 'd MMMM yyyy 'г.' HH:mm')
// Unable to parse 01 February 2011 г. 7:30 (format 'dd MMMM yyyy 'г.' H:mm')
// Unable to parse 01 February 2011 г. 07:30 (format 'dd MMMM yyyy 'г.' HH:mm')
// f: Unable to round-trip 4 of 4 format strings.
//
// Unable to parse 1 February 2011 г. 7:30:45 (format 'd MMMM yyyy 'г.' H:mm:ss')
// Unable to parse 1 February 2011 г. 07:30:45 (format 'd MMMM yyyy 'г.' HH:mm:ss')
// Unable to parse 01 February 2011 г. 7:30:45 (format 'dd MMMM yyyy 'г.' H:mm:ss')
// Unable to parse 01 February 2011 г. 07:30:45 (format 'dd MMMM yyyy 'г.' HH:mm:ss')
// F: Unable to round-trip 4 of 4 format strings.
//
// g: All custom format strings round trip.
//
// G: All custom format strings round trip.
//
// m: All custom format strings round trip.
//
// o: All custom format strings round trip.
//
// r: All custom format strings round trip.
//
// s: All custom format strings round trip.
//
// t: All custom format strings round trip.
//
// T: All custom format strings round trip.
//
// u: All custom format strings round trip.
//
// Unable to parse 1 February 2011 г. 7:30:45 (format 'd MMMM yyyy 'г.' H:mm:ss')
// Unable to parse 1 February 2011 г. 07:30:45 (format 'd MMMM yyyy 'г.' HH:mm:ss')
// Unable to parse 01 February 2011 г. 7:30:45 (format 'dd MMMM yyyy 'г.' H:mm:ss')
// Unable to parse 01 February 2011 г. 07:30:45 (format 'dd MMMM yyyy 'г.' HH:mm:ss')
// U: Unable to round-trip 4 of 4 format strings.
//
// y: All custom format strings round trip.
Imports System.Globalization
Module Example
Public Sub Main()
Dim culture As CultureInfo = CultureInfo.CreateSpecificCulture("ru-RU")
Dim formats() As String = { "d", "D", "f", "F", "g", "G", "m",
"o", "r", "s", "t", "T", "u", "U", "y" }
Dim date1 = New DateTime(2011, 02, 01, 7, 30, 45, 0)
Dim date2 As DateTime
Dim total, noRoundTrip As Integer
For Each fmt In formats
total = 0 : noRoundTrip = 0
For Each pattern In culture.DateTimeFormat.GetAllDateTimePatterns(CChar(fmt))
total += 1
If Not DateTime.TryParse(date1.ToString(pattern), date2)
noRoundTrip += 1
Console.WriteLine("Unable to parse {0:" + pattern + "} (format '{1}')",
date1, pattern)
End If
Next
If noRoundTrip > 0 Then
Console.WriteLine("{0}: Unable to round-trip {1} of {2} format strings.",
fmt, noRoundTrip, total)
Console.WriteLine()
Else
Console.WriteLine("{0}: All custom format strings round trip.", fmt)
Console.WriteLine()
End If
Next
End Sub
End Module
' The example displays the following output:
' d: All custom format strings round trip.
'
' Unable to parse 1 February 2011 г. (format 'd MMMM yyyy 'г.'')
' Unable to parse 01 February 2011 г. (format 'dd MMMM yyyy 'г.'')
' D: Unable to round-trip 2 of 2 format strings.
'
' Unable to parse 1 February 2011 г. 7:30 (format 'd MMMM yyyy 'г.' H:mm')
' Unable to parse 1 February 2011 г. 07:30 (format 'd MMMM yyyy 'г.' HH:mm')
' Unable to parse 01 February 2011 г. 7:30 (format 'dd MMMM yyyy 'г.' H:mm')
' Unable to parse 01 February 2011 г. 07:30 (format 'dd MMMM yyyy 'г.' HH:mm')
' f: Unable to round-trip 4 of 4 format strings.
'
' Unable to parse 1 February 2011 г. 7:30:45 (format 'd MMMM yyyy 'г.' H:mm:ss')
' Unable to parse 1 February 2011 г. 07:30:45 (format 'd MMMM yyyy 'г.' HH:mm:ss')
' Unable to parse 01 February 2011 г. 7:30:45 (format 'dd MMMM yyyy 'г.' H:mm:ss')
' Unable to parse 01 February 2011 г. 07:30:45 (format 'dd MMMM yyyy 'г.' HH:mm:ss')
' F: Unable to round-trip 4 of 4 format strings.
'
' g: All custom format strings round trip.
'
' G: All custom format strings round trip.
'
' m: All custom format strings round trip.
'
' o: All custom format strings round trip.
'
' r: All custom format strings round trip.
'
' s: All custom format strings round trip.
'
' t: All custom format strings round trip.
'
' T: All custom format strings round trip.
'
' u: All custom format strings round trip.
'
' Unable to parse 1 February 2011 г. 7:30:45 (format 'd MMMM yyyy 'г.' H:mm:ss')
' Unable to parse 1 February 2011 г. 07:30:45 (format 'd MMMM yyyy 'г.' HH:mm:ss')
' Unable to parse 01 February 2011 г. 7:30:45 (format 'dd MMMM yyyy 'г.' H:mm:ss')
' Unable to parse 01 February 2011 г. 07:30:45 (format 'dd MMMM yyyy 'г.' HH:mm:ss')
' U: Unable to round-trip 4 of 4 format strings.
'
' y: All custom format strings round trip.
若要分析可以用许多预定义自定义格式表示的日期和时间的字符串表示形式，请调用以下方法之一：
DateTime.ParseExact(String, String[], IFormatProvider, DateTimeStyles)
DateTimeOffset.ParseExact(String, String[], IFormatProvider, DateTimeStyles)
DateTime.TryParseExact(String, String[], IFormatProvider, DateTimeStyles, DateTime)
DateTimeOffset.TryParseExact(String, String[], IFormatProvider, DateTimeStyles, DateTimeOffset)
方法返回 GetAllDateTimePatterns 的数组中的自定义格式字符串取决于对象提供格式信息的区域性的 DateTimeFormatInfo 当前日历。 如果日历更改，此方法返回的数组也会更改。
另请参阅
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