IXmlNamespaceResolver.LookupNamespace(String) Method

Definition

Namespace:: System.Xml

Assembly:: System.Xml.ReaderWriter.dll

Assembly:: System.Xml.dll

Assembly:: netstandard.dll

Gets the namespace URI mapped to the specified prefix.

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

public string LookupNamespace (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).

Applies to