BaseURI Property

XmlValidatingReader.BaseURI Property

Gets the base URI of the current node.

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

public override string BaseURI { get; }

Property Value

Type: System.String
The base URI of the current node.


The XmlValidatingReader class is obsolete in .NET Framework 2.0. You can create a validating XmlReader instance by using the XmlReaderSettings class and the Create method. For more information, see the Remarks section of the XmlReader reference page.

A networked XML document is comprised of chunks of data aggregated by using various World Wide Web Consortium (W3C) standard inclusion mechanisms and therefore contains nodes that come from different places. document type definition (DTD) entities are an example of this, but this is not limited to DTDs. The base URI tells you where these nodes came from. If there is no base URI for the nodes being returned (for example, they were parsed from an in-memory string), String.Empty is returned.

The following example parses a file and displays the base URI of each node.

using System;
using System.IO;
using System.Xml;

public class Sample
  public static void Main()
    XmlValidatingReader reader = null;
    XmlTextReader txtreader = null;

        //Create the validating reader.
        txtreader = new XmlTextReader("http://localhost/uri.xml");
        reader = new XmlValidatingReader(txtreader);
        reader.ValidationType = ValidationType.None;

        //Parse the file and display the base URI for each node. 
        while (reader.Read())
            Console.WriteLine("({0}) {1}", reader.NodeType, reader.BaseURI);

       if (reader!=null)
} // End class

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

<!-- XML fragment -->
<!DOCTYPE book [<!ENTITY s SYSTEM "tmp/style.xml">]>
<book genre="novel">
  <title>Pride And Prejudice</title>

The style.xml file contains the XML text <style>hardcover</style>.

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1

.NET Framework Client Profile

Supported in: 4, 3.5 SP1
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