The System.Xml.XmlReader Class

Supported Versions

Public Members

Overview

This important abstract class represents the an XML 1.0-compliant reader object that can be used for forward-only access to XML streams. The following three specialized classes implement XmlReader:

-         XmlNodeReader

-         XmlTextReader

-         XmlValidatingReader

XmlReader also allows custom variations of the the class to be created. 

Example (VB.NET): How to pass an XmlTextReader object to an XmlReader parameter.

In the following example, we create an XmlTextReader object in a separate subroutine, and then pass it to the UseTheReader subroutine's XmlReader typed objXmlReader parameter. This routine subsequently uses the XmlReader object to read through the sample XML document.

    Private Sub Button1_Click(...)

        Dim objXmlReader As New System.Xml.XmlTextReader("C:\sample.xml")

        UseTheReader(objXmlReader)

    End Sub

    Sub UseTheReader(ByVal objXmlReader As System.Xml.XmlReader)

        Dim strValues As String

        While objXmlReader.Read()

            objXmlReader.MoveToContent()

            If objXmlReader.NodeType = XmlNodeType.Text Then

                strValues &= objXmlReader.Value & CrLf

            End If

        End While

        TextBox1.Text = strValues

    End Sub