DateTime.ToString 方法 (IFormatProvider) (System)

.NET Framework 類別庫

DateTime.ToString 方法 (IFormatProvider)

使用指定的特定文化特性的格式資訊，將這個執行個體的值轉換為它的對等字串表示。

命名空間： System
組件： mscorlib (在 mscorlib.dll 中)

語法

Visual Basic (宣告)

Public Function ToString ( _
    provider As IFormatProvider _
) As String

Visual Basic (使用方式)

Dim instance As DateTime
Dim provider As IFormatProvider
Dim returnValue As String

returnValue = instance.ToString(provider)

public string ToString (
    IFormatProvider provider
)

C++

public:
virtual String^ ToString (
    IFormatProvider^ provider
) sealed

public final String ToString (
    IFormatProvider provider
)

JScript

public final function ToString (
    provider : IFormatProvider
) : String

參數

provider: IFormatProvider，提供特定文化特性的格式資訊。

傳回值

依照 provider 指定這個執行個體值的字串表示。

備註

這個執行個體是使用一般格式規範 'G' 格式化的，如同在格式化概觀主題中所描述。傳回值和 <ToString ("G", null) 傳回的值相同。

provider 參數通常是 DateTimeFormatInfo 物件，或是包含 DateTimeFormatInfo 物件的 CultureInfo 執行個體。如果 provider 是 Null 參照 (即 Visual Basic 中的 Nothing)，則會使用目前文化特性相關的 DateTimeFormatInfo。如需詳細資訊，請參閱 CultureInfo.CurrentCulture。

範例

下列範例中，程式碼會使用不因國別而異的 DateTimeFormatInfo，透過不同方式來格式化 DateTime。

Visual Basic

Option Explicit
Option Strict

Imports System
Imports System.Globalization

Public Class MainClass
    
    Public Shared Sub Main()
        Dim dt As DateTime = DateTime.Now
        Dim myformat() As String =  {"d", "D", _
                                    "f", "F", _
                                    "g", "G", _
                                    "m", _
                                    "r", _
                                    "s", _
                                    "t", "T", _
                                    "u", "U", _
                                    "y", _
                                    "dddd, MMMM dd yyyy", _
                                    "ddd, MMM d ""'""yy", _
                                    "dddd, MMMM dd", _
                                    "M/yy", _
                                    "dd-MM-yy"}
        Dim mydate As String
        Dim i As Integer
        For i = 0 To myformat.Length - 1
            mydate = dt.ToString(myformat(i), DateTimeFormatInfo.InvariantInfo)
            Console.WriteLine(String.Concat(myformat(i), " :", mydate))
        Next i

    ' Output.
    '
    ' d :08/17/2000
    ' D :Thursday, August 17, 2000
    ' f :Thursday, August 17, 2000 16:32
    ' F :Thursday, August 17, 2000 16:32:32
    ' g :08/17/2000 16:32
    ' G :08/17/2000 16:32:32
    ' m :August 17
    ' r :Thu, 17 Aug 2000 23:32:32 GMT
    ' s :2000-08-17T16:32:32
    ' t :16:32
    ' T :16:32:32
    ' u :2000-08-17 23:32:32Z
    ' U :Thursday, August 17, 2000 23:32:32
    ' y :August, 2000
    ' dddd, MMMM dd yyyy :Thursday, August 17 2000
    ' ddd, MMM d "'"yy :Thu, Aug 17 '00
    ' dddd, MMMM dd :Thursday, August 17
    ' M/yy :8/00
    ' dd-MM-yy :17-08-00
    End Sub 'Main 
End Class 'MainClass

 using System;
 using System.Globalization; 
 
public class MainClass { 
    public static void Main(string[] args)  {
        DateTime dt = DateTime.Now;
        String[] format = {
            "d", "D",
            "f", "F",
            "g", "G",
            "m",
            "r",
            "s",
            "t", "T",
            "u", "U",
            "y",
            "dddd, MMMM dd yyyy",
            "ddd, MMM d \"'\"yy",
            "dddd, MMMM dd",
            "M/yy",
            "dd-MM-yy",
        };
        String date;
        for (int i = 0; i < format.Length; i++) {
            date = dt.ToString(format[i], DateTimeFormatInfo.InvariantInfo);
            Console.WriteLine(String.Concat(format[i], " :" , date));
        }
  
   /** Output.
    *
    * d :08/17/2000
    * D :Thursday, August 17, 2000
    * f :Thursday, August 17, 2000 16:32
    * F :Thursday, August 17, 2000 16:32:32
    * g :08/17/2000 16:32
    * G :08/17/2000 16:32:32
    * m :August 17
    * r :Thu, 17 Aug 2000 23:32:32 GMT
    * s :2000-08-17T16:32:32
    * t :16:32
    * T :16:32:32
    * u :2000-08-17 23:32:32Z
    * U :Thursday, August 17, 2000 23:32:32
    * y :August, 2000
    * dddd, MMMM dd yyyy :Thursday, August 17 2000
    * ddd, MMM d "'"yy :Thu, Aug 17 '00
    * dddd, MMMM dd :Thursday, August 17
    * M/yy :8/00
    * dd-MM-yy :17-08-00
    */
    }
}

C++

using namespace System;
using namespace System::Globalization;
void main()
{
   DateTime dt = DateTime::Now;
   array<String^>^format = {L"d",L"D",L"f",L"F",L"g",L"G",L"m",L"r",L"s",L"t",L"T",L"u",L"U",L"y",L"dddd, MMMM dd yyyy",L"ddd, MMM d \"'\"yy",L"dddd, MMMM dd",L"M/yy",L"dd-MM-yy"};
   String^ date;
   for ( int i = 0; i < format->Length; i++ )
   {
      date = dt.ToString( format[ i ], DateTimeFormatInfo::InvariantInfo );
      Console::WriteLine( String::Concat( format[ i ], L" :", date ) );

   }
   
   /** Output.
       *
       * d :08/17/2000
       * D :Thursday, August 17, 2000
       * f :Thursday, August 17, 2000 16:32
       * F :Thursday, August 17, 2000 16:32:32
       * g :08/17/2000 16:32
       * G :08/17/2000 16:32:32
       * m :August 17
       * r :Thu, 17 Aug 2000 23:32:32 GMT
       * s :2000-08-17T16:32:32
       * t :16:32
       * T :16:32:32
       * u :2000-08-17 23:32:32Z
       * U :Thursday, August 17, 2000 23:32:32
       * y :August, 2000
       * dddd, MMMM dd yyyy :Thursday, August 17 2000
       * ddd, MMM d "'"yy :Thu, Aug 17 '00
       * dddd, MMMM dd :Thursday, August 17
       * M/yy :8/00
       * dd-MM-yy :17-08-00
       */
}

import System.*;
import System.Globalization.*;

public class MainClass
{
    public static void main(String[] args)
    {
        DateTime dT = DateTime.get_Now();
        String format[] =  { "d", "D", "f", "F", "g", "G", "m", "r", "s", "t", 
            "T", "u", "U", "y", "dddd, MMMM dd yyyy", "ddd, MMM d \"'\"yy", 
            "dddd, MMMM dd", "M/yy", "dd-MM-yy" };
        String date;
        for (int i = 0; i < format.get_Length(); i++) {
            date = dT.ToString(format[i], DateTimeFormatInfo.get_InvariantInfo());
            Console.WriteLine(String.Concat(format[i], " :", date));
        }
    } //main 
} //MainClass 

 /** Output.
    *
    * d :08/17/2000
    * D :Thursday, August 17, 2000
    * f :Thursday, August 17, 2000 16:32
    * F :Thursday, August 17, 2000 16:32:32
    * g :08/17/2000 16:32
    * G :08/17/2000 16:32:32
    * m :August 17
    * r :Thu, 17 Aug 2000 23:32:32 GMT
    * s :2000-08-17T16:32:32
    * t :16:32
    * T :16:32:32
    * u :2000-08-17 23:32:32Z
    * U :Thursday, August 17, 2000 23:32:32
    * y :August, 2000
    * dddd, MMMM dd yyyy :Thursday, August 17 2000
    * ddd, MMM d "'"yy :Thu, Aug 17 '00
    * dddd, MMMM dd :Thursday, August 17
    * M/yy :8/00
    * dd-MM-yy :17-08-00
    */

JScript

import System;
import System.Globalization; 
 

var dt : DateTime = DateTime.Now;
var format : String[] = [
    "d", "D",
    "f", "F",
    "g", "G",
    "m",
    "r",
    "s",
    "t", "T",
    "u", "U",
    "y",
    "dddd, MMMM dd yyyy",
    "ddd, MMM d \"'\"yy",
    "dddd, MMMM dd",
    "M/yy",
    "dd-MM-yy",
    ];
var date : String;
for (var i : int = 0; i < format.Length; i++) {
    date = dt.ToString(format[i], DateTimeFormatInfo.InvariantInfo);
    Console.WriteLine(format[i] + " :" + date);
}

  
   /** Output.
    *
    * d :08/17/2000
    * D :Thursday, August 17, 2000
    * f :Thursday, August 17, 2000 16:32
    * F :Thursday, August 17, 2000 16:32:32
    * g :08/17/2000 16:32
    * G :08/17/2000 16:32:32
    * m :August 17
    * r :Thu, 17 Aug 2000 23:32:32 GMT
    * s :2000-08-17T16:32:32
    * t :16:32
    * T :16:32:32
    * u :2000-08-17 23:32:32Z
    * U :Thursday, August 17, 2000 23:32:32
    * y :August, 2000
    * dddd, MMMM dd yyyy :Thursday, August 17 2000
    * ddd, MMM d "'"yy :Thu, Aug 17 '00
    * dddd, MMMM dd :Thursday, August 17
    * M/yy :8/00
    * dd-MM-yy :17-08-00
    */

平台

Windows 98、 Windows 2000 SP4、 Windows CE、 Windows Millennium Edition、 Windows Mobile for Pocket PC、 Windows Mobile for Smartphone、 Windows Server 2003、 Windows XP Media Center Edition、 Windows XP Professional x64 Edition、 Windows XP SP2、 Windows XP Starter Edition

.NET Framework 並不支援各種平台的所有版本。如需支援平台版本的相關資訊，請參閱系統需求一節的內容。

版本資訊

.NET Framework

支援版本：2.0、1.1、1.0

.NET Compact Framework

支援版本：2.0、1.0

請參閱

參考

DateTime 結構
DateTime 成員
System 命名空間
DateTimeFormatInfo
CultureInfo