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XmlNamespaceManager.LookupNamespace Method

Microsoft Silverlight will reach end of support after October 2021. Learn more.

Gets the namespace URI for the specified prefix.

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

Syntax

'Declaration
Public Overridable Function LookupNamespace ( _
    prefix As String _
) As String

public virtual string LookupNamespace(
    string prefix
)

Parameters

  • prefix
    Type: System.String
    The prefix whose namespace URI you want to resolve. To match the default namespace, pass String.Empty.

Return Value

Type: System.String
Returns the namespace URI for prefix or nulla null reference (Nothing in Visual Basic) if there is no mapped namespace. The returned string is atomized.
For more information on atomized strings, see XmlNameTable.

Implements

IXmlNamespaceResolver.LookupNamespace(String)

Examples

Dim output As New StringBuilder()

Dim xmlFrag As String = _
      "<root>" & _
        "<data>" & _
         "<items>" & _
          "<item id='1'>" & _
          "</item>" & _
         "</items>" & _
        "</data>" & _
        "</root>"

Using reader As XmlReader = XmlReader.Create(New StringReader(xmlFrag))
    Dim nsmanager As New XmlNamespaceManager(reader.NameTable)
    nsmanager.AddNamespace("msbooks", "www.microsoft.com/books")
    nsmanager.PushScope()
    nsmanager.AddNamespace("msstore", "www.microsoft.com/store")

    Dim prefix As String
    For Each prefix In nsmanager
        output.AppendLine(("Prefix" + prefix + _
                           " Namespace=" + nsmanager.LookupNamespace(prefix)))
    Next prefix
End Using
OutputTextBlock.Text = output.ToString()


                StringBuilder output = new StringBuilder();

                // Create the string containing the XML to read.
                String xmlFrag =
                    @"<root>
                        <data>
                            <items>
                                <item id='1'>
                                </item>
                            </items>
                        </data>
                        </root>";

                using (XmlReader reader = XmlReader.Create(new StringReader(xmlFrag)))
                {
                    XmlNamespaceManager nsmanager = new XmlNamespaceManager(reader.NameTable);
                    nsmanager.AddNamespace("msbooks", "www.microsoft.com/books");
                    nsmanager.PushScope();
                    nsmanager.AddNamespace("msstore", "www.microsoft.com/store");

                    foreach (String prefix in nsmanager)
                    {
                        output.AppendLine("Prefix" + prefix + " Namespace=" +
                            nsmanager.LookupNamespace(prefix));
                    }
                }
                OutputTextBlock.Text = output.ToString();

Version Information

Silverlight

Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

XNA Framework

Supported in: Xbox 360, Windows Phone OS 7.0

Platforms

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.