IXmlNamespaceResolver.LookupPrefix Method

Gets the prefix that is mapped to the specified namespace URI.

Namespace:  System.Xml
Assembly:  System.Xml (in System.Xml.dll)

string LookupPrefix(
	string namespaceName
)

Parameters

namespaceName
Type: System.String
The namespace URI whose prefix you wish to find.

Return Value

Type: System.String
The prefix that is mapped to the namespace URI; null if the namespace URI is not mapped to a prefix.

It is possible for a namespace URI to be mapped to multiple prefixes. Because the prefixes are not mapped in a predictable manner, you should not depend on getting back a particular prefix when a namespace URI is mapped to more than one prefix.

NoteNote

Namespace URI to prefix mappings can change from node to node in an XML document. You cannot depend on the result of a lookup being consistent from one node to the next.

The following table describes how the default and built-in namespaces are handled by the LookupPrefix method.

Namespace

Return value

http://www.w3.org/XML/1998/namespace

xml

http://www.w3.org/2000/xmlns/

xmlns

An empty namespace.

A default namespace that has not been defined.

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

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