Convert.ToString 方法 (DateTime, IFormatProvider)

2013/12/13

将指定的 DateTime 的值转换为它的等效 String 表示形式。

Namespace:  System
程序集:  mscorlib(位于 mscorlib.dll 中)

声明
Public Shared Function ToString ( _
	value As DateTime, _
	provider As IFormatProvider _
) As String

参数

value
类型: System.DateTime
DateTime
provider
类型: System.IFormatProvider
IFormatProvider 接口实现,提供区域性特定的格式设置信息。

返回值

类型: System.String
等效于 value 的值的 String

此实现与 DateTime.ToString 相同。

下面的代码示例使用 ToString 方法通过 IFormatProvider 对象将 DateTime 值转换为 String


' Example of the Convert.ToString( DateTime ) and 
' Convert.ToString( DateTime, IFormatProvider ) methods.
Imports System.Globalization

Module Example

   Sub DisplayDateNCultureName(ByVal outputBlock As System.Windows.Controls.TextBlock, ByVal testDate As DateTime, _
       ByVal cultureName As String)

      ' Create the CultureInfo object for the specified culture,
      ' and use it as the IFormatProvider when converting the date.
      Dim culture As CultureInfo = New CultureInfo(cultureName)
      Dim dateString As String = _
          Convert.ToString(testDate, culture)

      ' Bracket the culture name, and display the name and date.
      outputBlock.Text &= String.Format("   {0,-12}{1}", _
          String.Concat("[", cultureName, "]"), dateString) & vbCrLf
   End Sub

   Public Sub Demo(ByVal outputBlock As System.Windows.Controls.TextBlock)
      ' Specify the date to be formatted under various cultures.
      Dim tDate As DateTime = _
          New DateTime(2003, 4, 15, 20, 30, 40, 333)

      outputBlock.Text &= String.Format("This example of " & vbCrLf & _
          "   Convert.ToString( DateTime ) and " & vbCrLf & _
          "   Convert.ToString( DateTime, IFormatProvider )" & _
          vbCrLf & "generates the following output. It " & _
          "creates CultureInfo objects " & vbCrLf & "for " & _
          "several cultures and formats " & _
          "a DateTime value with each." & vbCrLf) & vbCrLf

      ' Format the date without an IFormatProvider.
      outputBlock.Text &= String.Format("   {0,-12}{1}", _
          Nothing, "No IFormatProvider") & vbCrLf
      outputBlock.Text &= String.Format("   {0,-12}{1}", _
          Nothing, "------------------") & vbCrLf
      outputBlock.Text &= String.Format("   {0,-12}{1}" & vbCrLf, _
          String.Concat( _
              "[", CultureInfo.CurrentCulture.Name, "]"), _
          Convert.ToString(tDate)) & vbCrLf

      ' Format the date with IFormatProvider for several cultures.
      outputBlock.Text &= String.Format("   {0,-12}{1}", _
          "Culture", "With IFormatProvider") & vbCrLf
      outputBlock.Text &= String.Format("   {0,-12}{1}", _
          "-------", "--------------------") & vbCrLf

      DisplayDateNCultureName(outputBlock, tDate, "")
      DisplayDateNCultureName(outputBlock, tDate, "en-US")
      DisplayDateNCultureName(outputBlock, tDate, "es-AR")
      DisplayDateNCultureName(outputBlock, tDate, "fr-FR")
      DisplayDateNCultureName(outputBlock, tDate, "hi-IN")
      DisplayDateNCultureName(outputBlock, tDate, "ja-JP")
      DisplayDateNCultureName(outputBlock, tDate, "nl-NL")
      DisplayDateNCultureName(outputBlock, tDate, "ru-RU")
      DisplayDateNCultureName(outputBlock, tDate, "ur-PK")
   End Sub
End Module

' This example of
'    Convert.ToString( DateTime ) and
'    Convert.ToString( DateTime, IFormatProvider )
' generates the following output. It creates CultureInfo objects
' for several cultures and formats a DateTime value with each.
' 
'                No IFormatProvider
'                ------------------
'    [en-US]     4/15/2003 8:30:40 PM
' 
'    Culture     With IFormatProvider
'    -------     --------------------
'    []          04/15/2003 20:30:40
'    [en-US]     4/15/2003 8:30:40 PM
'    [es-AR]     15/04/2003 08:30:40 p.m.
'    [fr-FR]     15/04/2003 20:30:40
'    [hi-IN]     15-04-2003 20:30:40
'    [ja-JP]     2003/04/15 20:30:40
'    [nl-NL]     15-4-2003 20:30:40
'    [ru-RU]     15.04.2003 20:30:40
'    [ur-PK]     15/04/2003 8:30:40 PM


Windows Phone OS

受以下版本支持: 8.0, 7.1, 7.0

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