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LookupPrefix Method
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IXmlNamespaceResolver.LookupPrefix Method

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

Namespace:  System.Xml
Assemblies:   System.Xml (in System.Xml.dll)
  System.Xml.ReaderWriter (in System.Xml.ReaderWriter.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: 4.6, 4.5, 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

XNA Framework

Supported in: 3.0, 2.0, 1.0

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone Silverlight 8.1, Windows Phone Silverlight 8

Portable Class Library

Supported in: Portable Class Library
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