XmlNodeReader.HasValue Property

 
System_CAPS_noteNote

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

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

Public Overrides ReadOnly Property HasValue As Boolean

Property Value

Type: System.Boolean

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

System_CAPS_noteNote

In the .NET Framework 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 the Remarks section in 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.

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

Option Explicit
Option Strict

Imports System
Imports System.IO
Imports System.Xml

Public Class Sample
    Public Shared Sub Main()
        Dim reader As XmlNodeReader = Nothing

        Try
            'Create and load an XmlDocument.
            Dim doc As 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 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

        Finally
            If Not (reader Is Nothing) Then
                reader.Close()
            End If
        End Try
    End Sub 'Main ' End class
End Class 'Sample 

.NET Framework
Available since 1.1
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