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IXmlNamespaceResolver.LookupNamespace Method

Gets the namespace URI mapped to the specified prefix.

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

abstract LookupNamespace : 
        prefix:string -> string

Parameters

prefix
Type: System.String

The prefix whose namespace URI you wish to find.

Return Value

Type: System.String
The namespace URI that is mapped to the prefix; a null reference (Nothing in Visual Basic) if the prefix is not mapped to a namespace URI.

NoteNote

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 LookupNamespace method.

Prefix

Return Value

xml

http://www.w3.org/XML/1998/namespace

xmlns

http://www.w3.org/2000/xmlns/

String.Empty (A default namespace has been assigned).

The currently assigned default namespace.

String.Empty (The default namespace has not been explicitly assigned).

String.Empty (The blank prefix is associated with elements that are not in any namespace).

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

XNA Framework

Supported in: 3.0, 2.0, 1.0

Portable Class Library

Supported in: Portable Class Library

Supported in: Windows Phone 8.1

Supported in: Windows Phone Silverlight 8.1

Supported in: Windows Phone Silverlight 8
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