XmlReader.LookupNamespace Method (System.Xml)

LookupNamespace Method

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Microsoft Visual Studio 2008/.NET Framework 3.5

Other versions are also available for the following:

.NET Framework Class Library

XmlReader..::.LookupNamespace Method

When overridden in a derived class, resolves a namespace prefix in the current element's scope.

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

Syntax

Visual Basic (Declaration)

Public MustOverride Function LookupNamespace ( _
    prefix As String _
) As String

Visual Basic (Usage)

Dim instance As XmlReader
Dim prefix As String
Dim returnValue As String

returnValue = instance.LookupNamespace(prefix)

public abstract string LookupNamespace(
    string prefix
)

Visual C++

public:
virtual String^ LookupNamespace(
    String^ prefix
) abstract

JScript

public abstract function LookupNamespace(
    prefix : String
) : String

Parameters

prefix: Type: System..::.String
The prefix whose namespace 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 nullNothingnullptra null reference (Nothing in Visual Basic) if no matching prefix is found.

Remarks

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

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

Platforms

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC, Xbox 360, Zune

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Version Information

.NET Framework

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

.NET Compact Framework

Supported in: 3.5, 2.0, 1.0

XNA Framework

Supported in: 3.0, 2.0, 1.0

Reference

XmlReader Class

XmlReader Members

System.Xml Namespace

Other Resources

Reading XML with the XmlReader