IXmlNamespaceResolver.LookupNamespace(String) Method

Definition

Namespace:

System.Xml

Assembly:

System.Xml.ReaderWriter.dll

Gets the namespace URI mapped to the specified prefix.

public:
 System::String ^ LookupNamespace(System::String ^ prefix);

public string? LookupNamespace (string prefix);

abstract member LookupNamespace : string -> string

Public Function LookupNamespace (prefix As String) As String

Parameters

prefix

String

The prefix whose namespace URI you wish to find.

Returns

String

The namespace URI that is mapped to the prefix; null if the prefix is not mapped to a namespace URI.

Remarks

Note

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).