LookupPrefix Method
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IXmlNamespaceResolver.LookupPrefix Method (String)

 

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.

System_CAPS_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.

Universal Windows Platform
Available since 4.5
.NET Framework
Available since 2.0
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1
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