ReadAttributeValue Method

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 Overrides Function ReadAttributeValue As Boolean

Return Value

Type: System.Boolean

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.


Starting with the .NET Framework 2.0, we recommend that you create XmlReader instances by using the XmlReader.Create method to take advantage of new functionality.

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.

Imports System
Imports System.IO
Imports System.Xml

public class Sample

  public shared sub Main()

    Dim reader as XmlTextReader = nothing

       'Create the XML fragment to be parsed.
       Dim xmlFrag as string ="<book genre='novel' misc='sale-item &h; 1987'></book>"

       'Create the XmlParserContext.
       Dim context as XmlParserContext 
       Dim subset as string = "<!ENTITY h 'hardcover'>"
       context = new XmlParserContext(nothing, nothing, "book", nothing, nothing, 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.
       while (reader.ReadAttributeValue())
          if (reader.NodeType = XmlNodeType.EntityReference)
            Console.WriteLine("{0} {1}", reader.NodeType, reader.Name)
             Console.WriteLine("{0} {1}", reader.NodeType, reader.Value)
          end if
        end while

       if Not reader Is Nothing
      End if
      end try
  end sub
end class 

.NET Framework
Available since 1.1
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