GetUnicode Method (String, Int32, Int32)
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IdnMapping.GetUnicode Method (String, Int32, Int32)

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 function GetUnicode(
	ascii : String, 
	index : int, 
	count : int
) : String


Type: System.String

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

Type: System.Int32

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

Type: System.Int32

The number of characters to convert in the substring that starts at the position specified by ascii and index.

Return Value

Type: System.String
The Unicode equivalent of the IDNA substring specified by the ascii, index, and count parameters.


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


index or count is less than zero.


index is greater than the length of ascii.


index is greater than the length of ascii minus count.


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.

The following code example uses the GetAscii(String, Int32, Int32) method to convert a domain name to a domain name that complies with the IDNA standard. The GetUnicode(String, Int32, Int32) method then converts the standardized domain name back into the original domain name, except that the original label separators are replaced with the standard label separator.

No code example is currently available or this language may not be supported.

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

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

.NET Framework

Supported in: 3.5, 3.0, 2.0

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