VB.NET NumberFormatInfo類代碼示例

' 導入命名空間
Imports System.Globalization
Imports System.Text

Public Module Example
   Public Sub Main() 
      Dim sb As New StringBuilder()

      ' Loop through all the specific cultures known to the CLR.
      For Each ci In CultureInfo.GetCultures(CultureTypes.SpecificCultures) 
         ' Only show the currency symbols for cultures that speak English.
         If ci.TwoLetterISOLanguageName <> "en" Then Continue For

         ' Display the culture name and currency symbol.
         Dim nfi As NumberFormatInfo = ci.NumberFormat
         sb.AppendFormat("The currency symbol for '{0}' is '{1}'",
                         ci.DisplayName, nfi.CurrencySymbol)
         sb.AppendLine()
      Next
      Console.WriteLine(sb.ToString())
   End Sub
End Module

' 導入命名空間
Imports System.Globalization

Module Example
   Public Sub Main()
      Dim current1 As NumberFormatInfo = CultureInfo.CurrentCulture.NumberFormat
      Console.WriteLine(current1.IsReadOnly)
      
      Dim current2 As NumberFormatInfo = NumberFormatInfo.CurrentInfo
      Console.WriteLine(current2.IsReadOnly)
      
      Dim current3 As NumberFormatInfo = NumberFormatInfo.GetInstance(CultureInfo.CurrentCulture)
      Console.WriteLine(current3.IsReadOnly)
   End Sub
End Module

' 導入命名空間
Imports System.Globalization

Module Example
   Public Sub Main()
      Dim current1 As NumberFormatInfo = NumberFormatInfo.CurrentInfo
      current1 = CType(current1.Clone(), NumberFormatInfo)
      Console.WriteLine(current1.IsReadOnly)

      Dim culture2 As CultureInfo = CultureInfo.CreateSpecificCulture(CultureInfo.CurrentCulture.Name)
      Dim current2 As NumberFormatInfo = culture2.NumberFormat
      Console.WriteLine(current2.IsReadOnly)
   End Sub
End Module

' 導入命名空間
Imports System.Globalization

Module Example
   Public Sub Main()
      Dim culture As CultureInfo
      Dim nfi As NumberFormatInfo
      
      culture = CultureInfo.CurrentCulture
      nfi = culture.NumberFormat
      Console.WriteLine("Culture Name:    {0}", culture.Name)
      Console.WriteLine("User Overrides:  {0}", culture.UseUserOverride)
      Console.WriteLine("Currency Symbol: {0}", culture.NumberFormat.CurrencySymbol)
      Console.WriteLine()
            
      culture = New CultureInfo(CultureInfo.CurrentCulture.Name, False)
      Console.WriteLine("Culture Name:    {0}", culture.Name)
      Console.WriteLine("User Overrides:  {0}", culture.UseUserOverride)
      Console.WriteLine("Currency Symbol: {0}", culture.NumberFormat.CurrencySymbol)
   End Sub
End Module

' 導入命名空間
Imports System.Globalization

Module Example
   Public Sub Main()
      Dim nfi As NumberFormatInfo
      
      nfi = System.Globalization.NumberFormatInfo.InvariantInfo
      Console.WriteLine(nfi.IsReadOnly)               
      
      nfi = CultureInfo.InvariantCulture.NumberFormat
      Console.WriteLine(nfi.IsReadOnly)               
      
      nfi = New NumberFormatInfo()
      Console.WriteLine(nfi.IsReadOnly)               
   End Sub
End Module

' 導入命名空間
Imports System.Globalization

Module Example
   Public Sub Main()
      Dim culture As CultureInfo
      Dim nfi As NumberFormatInfo
      
      nfi = CultureInfo.GetCultureInfo("id-ID").NumberFormat
      Console.WriteLine("Read-only: {0}", nfi.IsReadOnly)
      
      culture = New CultureInfo("id-ID")
      nfi = NumberFormatInfo.GetInstance(culture)
      Console.WriteLine("Read-only: {0}", nfi.IsReadOnly)
      
      culture = CultureInfo.CreateSpecificCulture("id-ID")
      nfi = culture.NumberFormat
      Console.WriteLine("Read-only: {0}", nfi.IsReadOnly)
      
      culture = New CultureInfo("id-ID")
      nfi = culture.NumberFormat
      Console.WriteLine("Read-only: {0}", nfi.IsReadOnly)
   End Sub
End Module

' 導入命名空間
Imports System.Collections
Imports System.Collections.Generic
Imports System.Globalization
Imports System.Reflection

Module Example
   Public Sub Main()
      ' Get all the neutral cultures
      Dim names As New List(Of String)
      Array.ForEach(CultureInfo.GetCultures(CultureTypes.NeutralCultures),
                    Sub(culture) names.Add(culture.Name))
      names.Sort()
      For Each name In names
         ' Ignore the invariant culture.
         If name = "" Then Continue For
         
         ListSimilarChildCultures(name)        
      Next
   End Sub

   Private Sub ListSimilarChildCultures(name As String)
      ' Create the neutral NumberFormatInfo object.
      Dim nfi As NumberFormatInfo = CultureInfo.GetCultureInfo(name).NumberFormat
      ' Retrieve all specific cultures of the neutral culture.
      Dim cultures() As CultureInfo = Array.FindAll(CultureInfo.GetCultures(CultureTypes.SpecificCultures), 
                               Function(culture) culture.Name.StartsWith(name + "-", StringComparison.OrdinalIgnoreCase))
      ' Create an array of NumberFormatInfo properties
      Dim properties() As PropertyInfo = GetType(NumberFormatInfo).GetProperties(BindingFlags.Instance Or BindingFlags.Public)
      Dim hasOneMatch As Boolean = False

      For Each ci In cultures
         Dim match As Boolean = True     
         ' Get the NumberFormatInfo for a specific culture.
         Dim specificNfi As NumberFormatInfo = ci.NumberFormat
         ' Compare the property values of the two.
         For Each prop In properties
            ' We're not interested in the value of IsReadOnly.     
            If prop.Name = "IsReadOnly" Then Continue For
            
            ' For arrays, iterate the individual elements to see if they are the same.
            If prop.PropertyType.IsArray Then 
               Dim nList As IList = CType(prop.GetValue(nfi, Nothing), IList)
               Dim sList As IList = CType(prop.GetValue(specificNfi, Nothing), IList)
               If nList.Count <> sList.Count Then
                  match = false
                  Exit For
               End If 

               For ctr As Integer = 0 To nList.Count - 1
                  If Not nList(ctr).Equals(sList(ctr)) 
                     match = false
                     Exit For
                  End If     
               Next
            Else If Not prop.GetValue(specificNfi).Equals(prop.GetValue(nfi))
               match = false
               Exit For   
            End If        
         Next
         If match Then
            Console.WriteLine("NumberFormatInfo object for '{0}' matches '{1}'", 
                                      name, ci.Name)
            hasOneMatch = true
         End If                                       
      Next
      If Not hasOneMatch Then
         Console.WriteLine("NumberFormatInfo object for '{0}' --> No Match", name)            
      End If
      
      Console.WriteLine()
   End Sub
End Module

' 導入命名空間
Imports System.Globalization

Public Class CurrentCultureFormatProvider : Implements IFormatProvider
   Public Function GetFormat(formatType As Type) As Object _
                   Implements IFormatProvider.GetFormat
      Console.WriteLine("Requesting an object of type {0}", 
                        formatType.Name)
      If formatType Is GetType(NumberFormatInfo) Then
         Return NumberFormatInfo.CurrentInfo
      Else If formatType Is GetType(DateTimeFormatInfo) Then
         Return DateTimeFormatInfo.CurrentInfo
      Else
         Return Nothing
      End If
   End Function
End Class

Module Example
   Public Sub Main()
      Dim amount As Decimal = 1203.541d
      Dim value As String = amount.ToString("C2", New CurrentCultureFormatProvider())
      Console.WriteLine(value)
      Console.WriteLine()
      Dim composite As String = String.Format(New CurrentCultureFormatProvider, 
                                              "Date: {0}   Amount: {1}   Description: {2}",
                                              Date.Now, 1264.03d, "Service Charge")
      Console.WriteLine(composite)
      Console.WriteLine()
   End Sub
End Module

' 導入命名空間
Imports System.Globalization

Module Example
   Public Sub Main()
      Dim formatStrings() As String = { "C2", "E1", "F", "G3", "N", 
                                        "#,##0.000", "0,000,000,000.0##" }
      Dim culture As CultureInfo = CultureInfo.CreateSpecificCulture("en-US")
      Dim values() As Decimal = { 1345.6538d, 1921651.16d }
      
      For Each value In values
         For Each formatString In formatStrings
            Dim resultString As String = value.ToString(formatString, culture)
            Console.WriteLine("{0,-18} -->  {1}", formatString, resultString)
         Next
         Console.WriteLine()      
      Next   
   End Sub
End Module

Module Example
   Public Sub Main()
      Dim values() As Decimal = { 1345.6538d, 1921651.16d }
      
      For Each value In values
         Dim resultString As String = value.ToString()
         Console.WriteLine(resultString)
         Console.WriteLine()      
      Next   
   End Sub
End Module

' 導入命名空間
Imports System.Globalization

Module Example
   Public Sub Main()
      ' Retrieve a writable NumberFormatInfo object.
      Dim enUS As CultureInfo = CultureInfo.CreateSpecificCulture("en-US")
      Dim nfi As NumberFormatInfo = enUS.NumberFormat

      ' Use the ISO currency symbol instead of the native currency symbol.
      nfi.CurrencySymbol =  (New RegionInfo(enUS.Name)).ISOCurrencySymbol
      ' Change the positive currency pattern to <code><space><value>.
      nfi.CurrencyPositivePattern = 2
      ' Change the negative currency pattern to <code><space><sign><value>.     
      nfi.CurrencyNegativePattern = 12
      
      ' Produce the result strings by calling ToString.
      Dim values() As Decimal = { 1065.23d, 19.89d, -.03d, -175902.32d }
      For Each value In values
         Console.WriteLine(value.ToString("C", enUS))
      Next      
      Console.WriteLine()
      
      ' Produce the result strings by calling a composite formatting method.
      For Each value In values
         Console.WriteLine(String.Format(enUS, "{0:C}", value))      
      Next
   End Sub
End Module

' 導入命名空間
Imports System.Globalization

Module Example
   Public Sub Main()
      ' Instantiate a read-only NumberFormatInfo object.
      Dim enUS As CultureInfo = CultureInfo.CreateSpecificCulture("en-US")
      Dim nfi As NumberFormatInfo = enUS.NumberFormat

      ' Modify the relevant properties.
      nfi.NumberGroupSeparator = "-"
      nfi.NumberGroupSizes = { 3, 2, 4}
      nfi.NumberDecimalDigits = 0
      
      Dim ids() As Integer = { 111223333, 999776666 }
      
      ' Produce the result string by calling ToString.
      For Each id In ids
         Console.WriteLine(id.ToString("N", enUS))
      Next 
      Console.WriteLine()
      
      ' Produce the result string using composite formatting.
      For Each id In ids
         Console.WriteLine(String.Format(enUS, "{0:N}", id))
      Next
   End Sub
End Module

' 導入命名空間
Imports System.Globalization

Module Example
   Public Sub Main()
      Dim values() As String = { "1,034,562.91", "9 532 978,07" }
      Dim cultureNames() As String = { "en-US", "fr-FR", "" }
      
      For Each value In values
         For Each cultureName In cultureNames
            Dim culture As CultureInfo = CultureInfo.CreateSpecificCulture(cultureName)
            Dim name As String = If(culture.Name = "", "Invariant", culture.Name)
            Try
               Dim amount As Decimal = Decimal.Parse(value, culture)
               Console.WriteLine("'{0}' --> {1} ({2})", value, amount, name)
            Catch e As FormatException
               Console.WriteLine("'{0}': FormatException ({1})",
                                 value, name)
            End Try   
         Next
         Console.WriteLine()
      Next
   End Sub
End Module

' 導入命名空間
Imports System.Globalization

Module Example
   Public Sub Main()
      Dim stdCulture As CultureInfo = CultureInfo.GetCultureInfo("en-US")
      Dim custCulture As CultureInfo = CultureInfo.CreateSpecificCulture("en-US") 
            
      Dim value As String = "310,16"
      Try
         Console.WriteLine("{0} culture reflects user overrides: {1}", 
                           stdCulture.Name, stdCulture.UseUserOverride)
         Dim amount As Decimal = Decimal.Parse(value, stdCulture)
         Console.WriteLine("'{0}' --> {1}", value, amount.ToString(CultureInfo.InvariantCulture))                                                                                        
      Catch e As FormatException
         Console.WriteLine("Unable to parse '{0}'", value)
      End Try   
      Console.WriteLine()
                                            
      Try
         Console.WriteLine("{0} culture reflects user overrides: {1}", 
                           custCulture.Name, custCulture.UseUserOverride)
         Dim amount As Decimal = Decimal.Parse(value, custCulture)
         Console.WriteLine("'{0}' --> {1}", value, amount.ToString(CultureInfo.InvariantCulture))                                                                                        
      Catch e As FormatException
         Console.WriteLine("Unable to parse '{0}'", value)
      End Try   
   End Sub
End Module

' 導入命名空間
Imports System.Collections.Generic
Imports System.Globalization
Imports System.IO
Imports System.Threading

Module Example
   Public Sub Main()
      Thread.CurrentThread.CurrentCulture = CultureInfo.CreateSpecificCulture("en-US")
      PersistData()
      
      Thread.CurrentThread.CurrentCulture = CultureInfo.CreateSpecificCulture("en-GB")
      RestoreData()
   End Sub
   
   Private Sub PersistData()
      ' Define an array of floating-point values.
      Dim values() As Double = { 160325.972, 8631.16, 1.304e5, 98017554.385, 
                                 8.5938287084321676e94 }
      Console.WriteLine("Original values: ")
      For Each value In values
         Console.WriteLine(value.ToString("R", CultureInfo.InvariantCulture))
      Next
         
      ' Serialize an array of doubles to a file 
      Dim sw As New StreamWriter(".\NumericData.bin")
      For ctr As Integer = 0 To values.Length - 1
         sw.Write(values(ctr).ToString("R"))
         If ctr < values.Length - 1 Then sw.Write("|")
      Next
      sw.Close()
      Console.WriteLine()
   End Sub
   
   Private Sub RestoreData()   
      ' Deserialize the data
      Dim sr AS New StreamReader(".\NumericData.bin")
      Dim data As String = sr.ReadToEnd()
      sr.Close()
      
      Dim stringValues() As String = data.Split("|"c)
      Dim newValueList As New List(Of Double)
      
      For Each stringValue In stringValues
         Try
            newValueList.Add(Double.Parse(stringValue))
         Catch e As FormatException
            newValueList.Add(Double.NaN)
         End Try   
      Next                                   

      Console.WriteLine("Restored values:")
      For Each newValue In newValueList
         Console.WriteLine(newValue.ToString("R", NumberFormatInfo.InvariantInfo))
      Next
   End Sub
End Module