XmlValidatingReader.HasValue Property

Definition

Namespace:

System.Xml

Assembly:

System.Xml.ReaderWriter.dll

Source:

XmlValidatingReader.cs

Gets a value indicating whether the current node can have a Value other than String.Empty.

public:
 virtual property bool HasValue { bool get(); };

public override bool HasValue { get; }

member this.HasValue : bool

Public Overrides ReadOnly Property HasValue As Boolean

Property Value

Boolean

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

Examples

The following example reads in XML with various data types and displays each of the nodes.

#using <System.Xml.dll>

using namespace System;
using namespace System::IO;
using namespace System::Xml;
int main()
{
   
   //Create the validating reader.
   XmlTextReader^ txtreader = gcnew XmlTextReader( "book1.xml" );
   txtreader->WhitespaceHandling = WhitespaceHandling::None;
   XmlValidatingReader^ reader = gcnew XmlValidatingReader( txtreader );
   reader->ValidationType = ValidationType::None;
   
   //Parse the file and each node and its value.
   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 );
   }

   
   //Close the reader.
   reader->Close();
}

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

public class Sample
{

  public static void Main()
  {

    //Create the validating reader.
    XmlTextReader txtreader = new XmlTextReader("book1.xml");
    txtreader.WhitespaceHandling = WhitespaceHandling.None;
    XmlValidatingReader reader = new XmlValidatingReader(txtreader);
    reader.ValidationType = ValidationType.None;

    //Parse the file and each node and its value.
    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);
    }

    //Close the reader.
    reader.Close();
  }
} // End class

Imports System.IO
Imports System.Xml

public class Sample

  public shared sub  Main()
  
    'Create the validating reader.
    Dim txtreader as XmlTextReader = new XmlTextReader("book1.xml")
    txtreader.WhitespaceHandling = WhitespaceHandling.None
    Dim reader as XmlValidatingReader = new XmlValidatingReader(txtreader)
    reader.ValidationType = ValidationType.None

    'Parse the file and each node and its value.
    while (reader.Read())    
      if (reader.HasValue) then
        Console.WriteLine("({0})  {1}={2}", reader.NodeType, reader.Name, reader.Value)
      else
        Console.WriteLine("({0}) {1}", reader.NodeType, reader.Name)
      end if
    end while

    'Close the reader.
    reader.Close()
    
  end sub
end class 

Remarks

Note

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.

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.

See also

• XmlReader