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:
virtual bool ReadAttributeValue() override

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.

System_CAPS_noteNote

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.

#using <System.Xml.dll>

using namespace System;
using namespace System::IO;
using namespace System::Xml;
int main()
{
   XmlTextReader^ reader = nullptr;
   __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 = gcnew XmlParserContext( nullptr,nullptr,"book",nullptr,nullptr,subset,"","",XmlSpace::None );

      // Create the reader.
      reader = gcnew 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 != nullptr )
            reader->Close();
   }

}

.NET Framework
Available since 1.1
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