CultureInfo.ReadOnly Method

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

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

public static CultureInfo ReadOnly(
	CultureInfo ci


Type: System.Globalization.CultureInfo
The CultureInfo object to wrap.

Return Value

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


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.

using System;
using System.Globalization;

public class Example

   public static void Demo(System.Windows.Controls.TextBlock outputBlock)

      // Creates a CultureInfo.
      CultureInfo myCI = new CultureInfo("en-US");

      // Creates a read-only CultureInfo based on myCI.
      CultureInfo myReadOnlyCI = CultureInfo.ReadOnly(myCI);

      // Display the read-only status of each CultureInfo and their DateTimeFormat and NumberFormat properties.
      outputBlock.Text += String.Format("myCI is {0}.", myCI.IsReadOnly ? "read only" : "writable") + "\n";
      outputBlock.Text += String.Format("myCI.DateTimeFormat is {0}.", myCI.DateTimeFormat.IsReadOnly ? "read only" : "writable") + "\n";
      outputBlock.Text += String.Format("myCI.NumberFormat is {0}.", myCI.NumberFormat.IsReadOnly ? "read only" : "writable") + "\n";
      outputBlock.Text += String.Format("myReadOnlyCI is {0}.", myReadOnlyCI.IsReadOnly ? "read only" : "writable") + "\n";
      outputBlock.Text += String.Format("myReadOnlyCI.DateTimeFormat is {0}.", myReadOnlyCI.DateTimeFormat.IsReadOnly ? "read only" : "writable") + "\n";
      outputBlock.Text += String.Format("myReadOnlyCI.NumberFormat is {0}.", myReadOnlyCI.NumberFormat.IsReadOnly ? "read only" : "writable") + "\n";



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.



Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

XNA Framework

Supported in: Xbox 360, Windows Phone OS 7.0

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

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