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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
)

Parameters

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

Return Value

Type: System.String
The namespace URI to which the prefix maps or null if no matching prefix is found.

NoteNote

The XmlValidatingReader class is obsolete in .NET Framework version 2.0.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>

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

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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