DateTimeFormatInfo.GetAllDateTimePatterns Metodo
Definizione
Importante
Alcune informazioni sono relative alla release non definitiva del prodotto, che potrebbe subire modifiche significative prima della release definitiva. Microsoft non riconosce alcuna garanzia, espressa o implicita, in merito alle informazioni qui fornite.
Restituisce i modelli standard nei quali possono essere formattati i valori di data e ora.
Overload
| GetAllDateTimePatterns() |
Restituisce tutti i modelli standard nei quali possono essere formattati i valori di data e ora. |
| GetAllDateTimePatterns(Char) |
Restituisce tutti i modelli standard nei quali possono essere formattati i valori di data e ora mediante la stringa di formato standard specificato. |
GetAllDateTimePatterns()
- Origine:
- DateTimeFormatInfo.cs
- Origine:
- DateTimeFormatInfo.cs
- Origine:
- DateTimeFormatInfo.cs
Restituisce tutti i modelli standard nei quali possono essere formattati i valori di data e ora.
public:
cli::array <System::String ^> ^ GetAllDateTimePatterns();public string[] GetAllDateTimePatterns ();member this.GetAllDateTimePatterns : unit -> string[]Public Function GetAllDateTimePatterns () As String()Restituisce
String[]
Matrice che contiene i modelli standard nei quali possono essere formattati i valori di data e ora.
Esempio
Nell'esempio seguente vengono visualizzate le stringhe di formato data e ora per le impostazioni cultura invarianti, nonché la stringa di risultato generata quando tale stringa di formato viene usata per formattare una determinata data.
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
L'esempio crea un'istanza di un DateTimeFormatInfo oggetto che rappresenta le impostazioni cultura invarianti chiamando il DateTimeFormatInfo costruttore. Potrebbe anche recuperare un oggetto DateTimeFormatInfo che rappresenta le impostazioni cultura invarianti dalla InvariantInfo proprietà.
Commenti
Questo metodo restituisce una matrice che contiene tutte le stringhe di formato personalizzate corrispondenti alle stringhe di formato standard. Per un elenco delle stringhe di formato standard, vedere Stringhe di formato data e ora standard.
È possibile usare le stringhe di formato personalizzate nella matrice restituita dal GetAllDateTimePatterns metodo nelle operazioni di formattazione. Tuttavia, se si esegue questa operazione, la rappresentazione di stringa di un valore di data e ora restituita in tale operazione di formattazione non può essere sempre analizzata correttamente dai Parse metodi e TryParse . Pertanto, non è possibile presupporre che le stringhe di formato personalizzate restituite dal GetAllDateTimePatterns metodo possano essere usate per i valori di data e ora di round trip. L'esempio seguente illustra questo problema. Recupera un DateTimeFormatInfo oggetto che contiene informazioni di formattazione per le impostazioni cultura italia (italiano). Passa ogni stringa di formato personalizzata nella matrice restituita dal GetAllDateTimePatterns() metodo al DateTime.ToString(String) metodo per creare la rappresentazione stringa di una data e dell'ora. Questo esempio tenta quindi di analizzare questo valore chiamando il DateTime.TryParse(String, DateTime) metodo . Come illustrato dall'output dell'esempio, alcune delle stringhe di formato personalizzate non generano un valore di data e ora che ha esito positivo.
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.
Per analizzare la rappresentazione stringa di una data e dell'ora che può essere espressa in diversi formati personalizzati predefiniti, chiamare uno dei metodi seguenti:
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)
Le stringhe di formato personalizzate nella matrice restituite dal metodo dipendono dal GetAllDateTimePatterns calendario corrente delle impostazioni cultura per cui l'oggetto DateTimeFormatInfo fornisce informazioni di formattazione. Se il calendario cambia, la matrice restituita da questo metodo cambia anche.
Vedi anche
Si applica a
GetAllDateTimePatterns(Char)
- Origine:
- DateTimeFormatInfo.cs
- Origine:
- DateTimeFormatInfo.cs
- Origine:
- DateTimeFormatInfo.cs
Restituisce tutti i modelli standard nei quali possono essere formattati i valori di data e ora mediante la stringa di formato standard specificato.
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()Parametri
- format
- Char
Stringa di formato standard.
Restituisce
String[]
Matrice contenente i modelli standard nei quali possono essere formattati i valori data e ora mediante la stringa di formato specificato.
Eccezioni
format non è una stringa in formato standard valido.
Esempio
Nell'esempio seguente vengono visualizzati i modelli di data e ora per il calendario corrente.
#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'
'
Commenti
Questo metodo restituisce una matrice contenente le stringhe di formato personalizzate corrispondenti a una determinata stringa di formato standard. Per un elenco delle stringhe di formato standard, vedere Stringhe di formato data e ora standard.
È possibile usare le stringhe di formato personalizzate nella matrice restituita dal GetAllDateTimePatterns metodo nelle operazioni di formattazione. Tuttavia, se si esegue questa operazione, la rappresentazione di stringa di un valore di data e ora restituita in tale operazione di formattazione non può essere sempre analizzata correttamente dai Parse metodi e TryParse . Pertanto, non è possibile presupporre che le stringhe di formato personalizzate restituite dal GetAllDateTimePatterns metodo possano essere usate per i valori di data e ora di round trip. L'esempio seguente illustra questo problema. Recupera un DateTimeFormatInfo oggetto che contiene informazioni di formattazione per le impostazioni cultura russia (russo). Chiama il GetAllDateTimePatterns(Char) metodo per ogni stringa di formato standard e quindi passa ogni stringa di formato personalizzata nella matrice restituita al DateTime.ToString(String) metodo per creare la rappresentazione stringa di una data e dell'ora. Questo esempio tenta quindi di analizzare questo valore chiamando il DateTime.TryParse(String, DateTime) metodo . Come illustrato dall'output dell'esempio, alcune delle stringhe di formato personalizzate non generano un valore di data e ora che ha esito positivo.
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.
Per analizzare la rappresentazione stringa di una data e dell'ora che può essere espressa in diversi formati personalizzati predefiniti, chiamare uno dei metodi seguenti:
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)
Le stringhe di formato personalizzate nella matrice restituite dal metodo dipendono dal GetAllDateTimePatterns calendario corrente delle impostazioni cultura per cui l'oggetto DateTimeFormatInfo fornisce informazioni di formattazione. Se il calendario cambia, la matrice restituita da questo metodo cambia anche.
Vedi anche
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