LookupNamespace Method

XmlValidatingReader.LookupNamespace Method

Resolves a namespace prefix in the current element's scope.

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

public override string LookupNamespace (
	string prefix
)
public String LookupNamespace (
	String prefix
)
public override function LookupNamespace (
	prefix : String
) : String
Not applicable.

Parameters

prefix

The prefix whose namespace Uniform Resource Identifier (URI) you want to resolve. To match the default namespace, pass an empty string.

Return Value

The namespace URI to which the prefix maps or a null reference (Nothing in Visual Basic) if no matching prefix is found.

NoteNote:

The XmlValidatingReader class is obsolete in Microsoft .NET Framework version 2.0. You can create a validating XmlReader instance by using the XmlReaderSettings class and the Create method. For more information, see Validating XML Data with XmlReader.

In the following XML string, if the reader is positioned on the href attribute, the prefix a is resolved by calling reader.LookupNamespace("a", true). The returned string is urn:456.

 <root xmlns:a="urn:456">
  <item>
  <ref href="a:b"/>
  </item>
 </root>

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

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0, 1.1, 1.0

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