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XNamespace.Xmlns Property

Gets the XNamespace object that corresponds to the xmlns URI (http://www.w3.org/2000/xmlns/).

Namespace:  System.Xml.Linq
Assembly:  System.Xml.Linq (in System.Xml.Linq.dll)
public static XNamespace Xmlns { get; }

Property Value

Type: System.Xml.Linq.XNamespace
The XNamespace that corresponds to the xmlns URI (http://www.w3.org/2000/xmlns/).

When you declare namespaces, the namespace attributes themselves are in the xmlns namespace. The W3C standard specifies that this namespace does not have to be declared as an attribute in the XML tree. It is a reserved namespace that is always automatically available in the XML parser.

The following example shows how to add a namespace to an XML tree. The namespace for the attribute that declares the namespace is the namespace returned by this property.

XNamespace aw = "http://www.adventure-works.com";
XElement root = new XElement(aw + "Root",
    new XAttribute(XNamespace.Xmlns + "aw", "http://www.adventure-works.com"),
    new XElement(aw + "Child", "content")
);
Console.WriteLine(root);

In Visual Basic, the preferred idiom is:

[vb]

Imports <xmlns:aw='http://www.adventure-works.com'>

Module Module1
    Sub Main()
        Dim root As XElement = _
            <aw:Root>
                <aw:Child>content</aw:Child>
            </aw:Root>
        Console.WriteLine(root)
    End Sub
End Module

This example produces the following output:

<aw:Root xmlns:aw="http://www.adventure-works.com">
  <aw:Child>content</aw:Child>
</aw:Root>

.NET Framework

Supported in: 4.5.1, 4.5, 4, 3.5

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

.NET for Windows Store apps

Supported in: Windows 8

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone 8, Silverlight 8.1

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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