IdnMapping.GetUnicode Method (String, Int32)

Note: This method is new in the .NET Framework version 2.0.

Decodes a substring of one or more domain name labels encoded according to the Internationalizing Domain Names in Applications (IDNA) standard to a string of Unicode characters.

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

public string GetUnicode (
	string ascii,
	int index
public String GetUnicode (
	String ascii, 
	int index
public function GetUnicode (
	ascii : String, 
	index : int
) : String



One or more labels in the US-ASCII character range (U+0020 to U+007E) encoded according to the IDNA standard.


A zero-based offset into ascii that specifies the start of the substring.

Return Value

The Unicode equivalent of the IDNA substring specified by the ascii and index parameters.

Exception typeCondition


ascii is a null reference (Nothing in Visual Basic).


index is less than zero.


index is greater than the length of ascii.


ascii is invalid based on the AllowUnassigned and UseStd3AsciiRules properties, and the IDNA standard.

For more information about domain names, labels, and label separators, see the remarks for the IdnMapping.GetAscii(String,Int32,Int32) method.

Windows 98, Windows 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.

.NET Framework

Supported in: 2.0

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