XmlReader.NamespaceURI Property

Definition

Namespace:

System.Xml

Assemblies:

netstandard.dll, System.Xml.ReaderWriter.dll

Source:

XmlReader.cs

When overridden in a derived class, gets the namespace URI (as defined in the W3C Namespace specification) of the node on which the reader is positioned.

C#

public abstract string NamespaceURI { get; }

Property Value

String

The namespace URI of the current node; otherwise an empty string.

Exceptions

InvalidOperationException

An XmlReader method was called before a previous asynchronous operation finished. In this case, InvalidOperationException is thrown with the message "An asynchronous operation is already in progress."

Examples

The following example displays the local name of each node, and, if they exist, the prefix and namespace URI.

C#

XmlReader reader = XmlReader.Create("book2.xml");

// Parse the file.  If they exist, display the prefix and
// namespace URI of each node.
while (reader.Read()) {
  if (reader.IsStartElement()) {
    if (reader.Prefix==String.Empty)
                {
                    Console.WriteLine("<{0}>", reader.LocalName);
                }
                else {
      Console.Write("<{0}:{1}>", reader.Prefix, reader.LocalName);
      Console.WriteLine(" The namespace URI is " + reader.NamespaceURI);
    }
  }
}
reader.Close();

The example uses the file, book2.xml, as input.

XML

<book xmlns:bk='urn:samples'>
  <title>Pride And Prejudice</title>
  <bk:genre>novel</bk:genre>
</book>

Remarks

This property is relevant to Element and Attribute nodes only.

Applies to