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XmlTextReader.ReadAttributeValue Method

Parses the attribute value into one or more Text, EntityReference, or EndEntity nodes.

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

public override bool ReadAttributeValue ()
public boolean ReadAttributeValue ()
public override function ReadAttributeValue () : boolean
Not applicable.

Return Value

true if there are nodes to return. false if the reader is not positioned on an attribute node when the initial call is made or if all the attribute values have been read. An empty attribute, such as, misc="", returns true with a single node with a value of String.Empty.

NoteNote:

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

Use this method after calling MoveToAttribute to read through the text or entity reference nodes that make up the attribute value. The Depth of the attribute value nodes is one plus the depth of the attribute node; it increments and decrements by one when you step into and out of general entity references.

The following example reads an attribute with text and entity nodes.

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

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

    try
    {
       //Create the XML fragment to be parsed.
       string xmlFrag ="<book genre='novel' misc='sale-item &h; 1987'></book>";
 
       //Create the XmlParserContext.
       XmlParserContext context;
       string subset = "<!ENTITY h 'hardcover'>";
       context = new XmlParserContext(null, null, "book", null, null, subset, "", "", XmlSpace.None);
        
       //Create the reader.
       reader = new XmlTextReader(xmlFrag, XmlNodeType.Element, context);
  
       //Read the misc attribute. The attribute is parsed
       //into multiple text and entity reference nodes.
       reader.MoveToContent();
       reader.MoveToAttribute("misc");
       while (reader.ReadAttributeValue()){
          if (reader.NodeType==XmlNodeType.EntityReference)
            Console.WriteLine("{0} {1}", reader.NodeType, reader.Name);
          else
             Console.WriteLine("{0} {1}", reader.NodeType, reader.Value);
        } 
     } 
     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)
    {
        XmlTextReader reader = null;

        try {
            //Create the XML fragment to be parsed.
            String xmlFrag = "<book genre='novel' misc='sale-item &h; 1987'>" 
                + "</book>";
            //Create the XmlParserContext.
            XmlParserContext context;
            String subset = "<!ENTITY h 'hardcover'>";
            context = new XmlParserContext(null, null, "book", null, null, 
                subset, "", "", XmlSpace.None);
            //Create the reader.
            reader = new XmlTextReader(xmlFrag, XmlNodeType.Element, context);
            //Read the misc attribute. The attribute is parsed
            //into multiple text and entity reference nodes.
            reader.MoveToContent();
            reader.MoveToAttribute("misc");
            while (reader.ReadAttributeValue()) {
                if (reader.get_NodeType().Equals(XmlNodeType.EntityReference)) {
                    Console.WriteLine("{0} {1}", reader.get_NodeType(), reader.
                    get_Name());
                }
                else {
                    Console.WriteLine("{0} {1}", reader.get_NodeType(),
                        reader.get_Value());
                }
            }
        }
        finally {
            if (reader != null) {
                reader.Close();
            }
        }
    } //main
} //End class Sample 

Windows 98, Windows Server 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 Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0, 1.0

XNA Framework

Supported in: 1.0

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