System.Xml.IXmlNamespaceResolver.LookupPrefix Method

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

Syntax

public string LookupPrefix (string namespaceName)

Parameters

namespaceName
The namespace URI whose prefix you wish to find.

Returns

The prefix that is mapped to the namespace URI; null if the namespace URI is not mapped to a prefix.

Remarks

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.

Note:

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 IXmlNamespaceResolver.LookupPrefix(string) method.

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.

Requirements

Namespace: System.Xml
Assembly: System.Xml (in System.Xml.dll)
Assembly Versions: 2.0.0.0, 4.0.0.0
Since: .NET 2.0