LookupPrefix Method
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XmlNamespaceManager.LookupPrefix Method

[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]

Finds the prefix declared for the given namespace URI.

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

'Declaration
Public Overridable Function LookupPrefix ( _
	uri As String _
) As String

Parameters

uri
Type: System.String
The namespace to resolve for the prefix.

Return Value

Type: System.String
The matching prefix. If there is no mapped prefix, the method returns String.Empty. If a null value is supplied, then Nothing is returned.

Implements

IXmlNamespaceResolver.LookupPrefix(String)

This method finds the mapped prefix by walking the stack (that is, it looks globally). The supplied string must be atomized for the lookup to succeed. In other words, the supplied string object must exist in the XmlNamespaceManager's NameTable.

The returned string is also atomized. For more information on atomized strings, see XmlNameTable.


Dim output As New StringBuilder()
' Create the XmlNamespaceManager.
Dim nt As New NameTable()
Dim nsmgr As New XmlNamespaceManager(nt)

' Add prefix/namespace pairs to the XmlNamespaceManager.
nsmgr.AddNamespace("", "www.wideworldimporters.com") 'Adds a default namespace.
nsmgr.AddNamespace("europe", "www.wideworldimporters.com/europe")

Dim prefix As String = nsmgr.LookupPrefix("www.wideworldimporters.com/europe")
output.AppendLine((" Before removing prefix: " + prefix))
nsmgr.RemoveNamespace(prefix, "www.wideworldimporters.com/europe")
output.Append((" Before removing prefix: " + nsmgr.LookupPrefix("www.wideworldimporters.com/europe")))

OutputTextBlock.Text = output.ToString()


Windows Phone OS

Supported in: 8.1, 8.0, 7.1, 7.0

Windows Phone

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