Resolves a namespace prefix in the current element's scope.
(in System.Xml.dll)
Visual Basic (Declaration)
Public Overrides Function LookupNamespace ( _
prefix As String _
) As String
Dim instance As XmlTextReader
Dim prefix As String
Dim returnValue As String
returnValue = instance.LookupNamespace(prefix)
public override string LookupNamespace(
string prefix
)
public:
virtual String^ LookupNamespace(
String^ prefix
) override
public override 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. This string does not have to be atomized.
Return Value
Type:
System..::.StringThe namespace URI to which the prefix maps or nullNothingnullptra null reference (Nothing in Visual Basic) if no matching prefix is found.
| Exception | Condition |
|---|
| ArgumentNullException | The Namespaces property is set to true and the prefix value is nullNothingnullptra null reference (Nothing in Visual Basic). |
.gif) Note: |
|---|
In the .NET Framework version 2.0 release, the recommended practice is to create XmlReader instances using the XmlReader..::.Create method. This allows you to take full advantage of the new features introduced in this release. For more information, see Creating XML Readers. |
In the following XML, 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>
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.
.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
Other Resources