IXmlNamespaceResolver.LookupPrefix(String) Method
Definition
Important
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Gets the prefix that is mapped to the specified namespace URI.
public:
System::String ^ LookupPrefix(System::String ^ namespaceName);
public string LookupPrefix (string namespaceName);
public string? LookupPrefix (string namespaceName);
abstract member LookupPrefix : string -> string
Public Function LookupPrefix (namespaceName As String) As String
Parameters
- namespaceName
- String
The namespace URI whose prefix you wish to find.
Returns
The prefix that is mapped to the namespace URI; null
if the namespace URI is not mapped to a prefix.
Remarks
It is possible for a namespace URI to be mapped to multiple prefixes. Because the prefixes are not mapped in a predictable manner, you should not depend on getting back a particular prefix when a namespace URI is mapped to more than one prefix.
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 LookupPrefix method.
Namespace | Return value |
---|---|
http://www.w3.org/XML/1998/namespace | xml |
http://www.w3.org/2000/xmlns/ | xmlns |
An empty namespace. | A default namespace that has not been defined. |
Applies to
.NET
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