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XmlNodeReader.HasValue Property

Gets a value indicating whether the current node can have a Value.

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

public override bool HasValue { get; }
/** @property */
public boolean get_HasValue ()

public override function get HasValue () : boolean

Property Value

true if the node on which the reader is currently positioned can have a Value; otherwise, false.

NoteNote

In the Microsoft .NET Framework version 2.0, the recommended practice is to create XmlReader instances using the XmlReaderSettings class and the Create method. This allows you to take full advantage of all the new features introduced in the .NET Framework. For more information, see Creating XML Readers.

The following table lists node types that have a value to return.

Node Type

Value

Attribute

The value of the attribute.

CDATA

The content of the CDATA section.

Comment

The content of the comment.

DocumentType

The internal subset.

ProcessingInstruction

The entire content, excluding the target.

SignificantWhitespace

The white space between markup in a mixed content model.

Text

The content of the text node.

Whitespace

The white space between markup.

XmlDeclaration

The content of the declaration.

The following example displays the value for every node which can have a value.

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

public class Sample {

  public static void Main() {
  
    XmlNodeReader reader = null;

    try {
               
        // Create and load an XmlDocument.
        XmlDocument doc = new XmlDocument();
        doc.LoadXml("<?xml version='1.0' ?>" +
                    "<!DOCTYPE book [<!ENTITY h 'hardcover'>]>" +
                    "<book>" +
                    "<title>Pride And Prejudice</title>" +
                    "<misc>&h;</misc>" +
                    "</book>");

        reader = new XmlNodeReader(doc);

        // Parse the file and display each node.
        while (reader.Read()) {
           if (reader.HasValue)
             Console.WriteLine("({0})  {1}={2}", reader.NodeType, reader.Name, reader.Value);
           else
             Console.WriteLine("({0}) {1}", reader.NodeType, reader.Name);
         }           
     }

     finally {
       if (reader!=null)
         reader.Close();
     }
  }
} // End class

import System.*;
import System.IO.*;
import System.Xml.*;

public class Sample
{
    public static void main(String[] args)
    {
        XmlNodeReader reader = null;
        try {
            // Create and load an XmlDocument.
            XmlDocument doc = new XmlDocument();
            doc.LoadXml("<?xml version='1.0' ?>"
                + "<!DOCTYPE book [<!ENTITY h 'hardcover'>]>"
                + "<book>"
                + "<title>Pride And Prejudice</title>"
                + "<misc>&h;</misc>"
                + "</book>");

            reader = new XmlNodeReader(doc);

            // Parse the file and display each node.
            while (reader.Read()) {
                if (reader.get_HasValue()) {
                    Console.WriteLine("({0})  {1}={2}", reader.get_NodeType(), 
                        reader.get_Name(), reader.get_Value());
                }
                else {
                    Console.WriteLine("({0}) {1}", reader.get_NodeType(), 
                        reader.get_Name());
                }
            }
        } 
        finally {
            if (reader != null) {
                reader.Close();
            }
        }
    } //main
} //End class Sample

Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

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

.NET Framework

Supported in: 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0, 1.0

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