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CultureInfo.ReadOnly Method

Returns a read-only wrapper around the specified CultureInfo object.

Namespace:  System.Globalization
Assemblies:   mscorlib (in mscorlib.dll)
  System.Globalization (in System.Globalization.dll)

'Declaration
Public Shared Function ReadOnly ( _
	ci As CultureInfo _
) As CultureInfo

Parameters

ci
Type: System.Globalization.CultureInfo

The CultureInfo object to wrap.

Return Value

Type: System.Globalization.CultureInfo
A read-only CultureInfo wrapper around ci.

ExceptionCondition
ArgumentNullException

ci is null.

This wrapper prevents any modifications to ci, or the objects returned by the ci.DateTimeFormat and ci.NumberFormat properties.

The following example shows that the ReadOnly method helps protect the DateTimeFormatInfo and NumberFormatInfo instances associated with the CultureInfo.

Imports System
Imports System.Globalization


Public Class SamplesCultureInfo

   Public Shared Sub Main()

      ' Creates a CultureInfo. 
      Dim myCI As New CultureInfo("en-US")

      ' Creates a read-only CultureInfo based on myCI. 
      Dim myReadOnlyCI As CultureInfo = CultureInfo.ReadOnly(myCI)

      ' Display the read-only status of each CultureInfo and their DateTimeFormat and NumberFormat properties. 
      If myCI.IsReadOnly Then 
         Console.WriteLine("myCI is read only.")
      Else
         Console.WriteLine("myCI is writable.")
      End If 

      If myCI.DateTimeFormat.IsReadOnly Then 
         Console.WriteLine("myCI.DateTimeFormat is read only.")
      Else
         Console.WriteLine("myCI.DateTimeFormat is writable.")
      End If 

      If myCI.NumberFormat.IsReadOnly Then 
         Console.WriteLine("myCI.NumberFormat is read only.")
      Else
         Console.WriteLine("myCI.NumberFormat is writable.")
      End If 

      If myReadOnlyCI.IsReadOnly Then 
         Console.WriteLine("myReadOnlyCI is read only.")
      Else
         Console.WriteLine("myReadOnlyCI is writable.")
      End If 

      If myReadOnlyCI.DateTimeFormat.IsReadOnly Then 
         Console.WriteLine("myReadOnlyCI.DateTimeFormat is read only.")
      Else
         Console.WriteLine("myReadOnlyCI.DateTimeFormat is writable.")
      End If 

      If myReadOnlyCI.NumberFormat.IsReadOnly Then 
         Console.WriteLine("myReadOnlyCI.NumberFormat is read only.")
      Else
         Console.WriteLine("myReadOnlyCI.NumberFormat is writable.")
      End If 

   End Sub 'Main 

End Class 'SamplesCultureInfo


' This code produces the following output. 

' myCI is writable. 
' myCI.DateTimeFormat is writable. 
' myCI.NumberFormat is writable. 
' myReadOnlyCI is read only. 
' myReadOnlyCI.DateTimeFormat is read only. 
' myReadOnlyCI.NumberFormat is read only.

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

XNA Framework

Supported in: 3.0, 2.0, 1.0

Portable Class Library

Supported in: Portable Class Library

Supported in: Windows Phone 8.1

Supported in: Windows Phone Silverlight 8.1

Supported in: Windows Phone Silverlight 8
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