Xmlvalidatingreader sample code

11-Sep-2017 11:34

The Xml Reader class has many other members, as shown in Table 3.1. That is, this class is marked with the Must Inherit modifier; you cannot create an instance of Xml Reader in your own application. You can't directly create an Xml Node object that represents an entity from a particular XML document. Attributes If Not atts Is Nothing Then For int J = 0 To atts. To String str Node = str Node & ": " & _ atts(int J).

Generally, you'll use the Xml Text Reader class instead. Instead, you can retrieve Xml Node objects from an Xml Document object. Count - 1 str Node = "" For int I = 1 To Depth 1 str Node &= " " Next str Node = str Node & _ atts(int J).

Here's the raw XML file: The Document Object Model, or DOM, is an Internet standard for representing the information contained in an HTML or XML document as a tree of nodes. Close() End Sub The DOM includes nodes for everything in the XML file, including the XML declaration and any whitespace (such as the line feeds and carriage returns that separate lines of the files).

Like many other Internet standards, the DOM is an official standard of the World Wide Web Consortium, better known as the W3C. In its simplest form, the DOM defines an XML document as consisting as a tree of nodes. On the other hand, the node tree doesn't include XML attributes, though you can retrieve them from the parent elements.

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The class implements a Read method that returns the next XML node to the calling application. Table 3.2 shows the important members of the Xml Node class. Add(str Node) ' Now add the attributes, if any atts = xnod. Add(str Node) Next End If ' And recursively walk ' the children of this node Dim xnodworking As Xml Node If xnod. First Child While Not Is Nothing(xnodworking) Add Children(xnodworking, Depth 1) xnodworking = xnodworking.

You'll see later in the chapter that this is reflected in the classes provided by the . The Xml Reader class is designed to provide forward-only, read-only access to an XML file. If you instantiate an Xml Node object to represent a particular portion of an XML document, you can alter the properties of the object and then write the changes back to the original file.

This class treats an XML file similar to the way a cursor treats a resultset from a database. The DOM provides two-way access to the underlying XML in this case. Xml namespace also contains a set of classes that represent particular types of nodes: Xml Attribute, Xml Comment, Xml Element, and so on. The Xml Node class has a rich interface of properties and methods.

The Xml Text Reader class implements Xml Reader for use with text streams. Click Dim int I As Integer Dim int J As Integer Dim str Node As String ' Create a new Xml Text Reader on the file Dim xtr As Xml Text Reader = _ New Xml Text Reader("Books.xml") ' Walk through the entire XML file Do While xtr. The Xml Document object represents an entire XML document.

Here's how you might use this class to dump the nodes of an XML file to a List Box control: Private Sub btn Read Xml_Click( _ By Val sender As System. By combining the Xml Node and Xml Document objects, you can navigate through the DOM representation of an XML document. Click Dim int I As Integer Dim int J As Integer Dim str Node As String ' Create a new Xml Text Reader on the file Dim xtr As Xml Text Reader = _ New Xml Text Reader("Books.xml") ' Load the XML file to an Xml Document xtr. None Dim xd As Xml Document = New Xml Document() xd. Text) Then str Node = "" For int I = 1 To Depth str Node &= " " Next str Node = str Node & xnod.

The class implements a Read method that returns the next XML node to the calling application. Table 3.2 shows the important members of the Xml Node class. Add(str Node) ' Now add the attributes, if any atts = xnod. Add(str Node) Next End If ' And recursively walk ' the children of this node Dim xnodworking As Xml Node If xnod. First Child While Not Is Nothing(xnodworking) Add Children(xnodworking, Depth 1) xnodworking = xnodworking.You'll see later in the chapter that this is reflected in the classes provided by the . The Xml Reader class is designed to provide forward-only, read-only access to an XML file. If you instantiate an Xml Node object to represent a particular portion of an XML document, you can alter the properties of the object and then write the changes back to the original file.This class treats an XML file similar to the way a cursor treats a resultset from a database. The DOM provides two-way access to the underlying XML in this case. Xml namespace also contains a set of classes that represent particular types of nodes: Xml Attribute, Xml Comment, Xml Element, and so on. The Xml Node class has a rich interface of properties and methods.The Xml Text Reader class implements Xml Reader for use with text streams. Click Dim int I As Integer Dim int J As Integer Dim str Node As String ' Create a new Xml Text Reader on the file Dim xtr As Xml Text Reader = _ New Xml Text Reader("Books.xml") ' Walk through the entire XML file Do While xtr. The Xml Document object represents an entire XML document. Here's how you might use this class to dump the nodes of an XML file to a List Box control: Private Sub btn Read Xml_Click( _ By Val sender As System. By combining the Xml Node and Xml Document objects, you can navigate through the DOM representation of an XML document. Click Dim int I As Integer Dim int J As Integer Dim str Node As String ' Create a new Xml Text Reader on the file Dim xtr As Xml Text Reader = _ New Xml Text Reader("Books.xml") ' Load the XML file to an Xml Document xtr. None Dim xd As Xml Document = New Xml Document() xd. Text) Then str Node = "" For int I = 1 To Depth str Node &= " " Next str Node = str Node & xnod. Xml Validating Reader implements the Xml Reader class and provides support for data validation. Schemas property to have the reader validate using schema files cached in an Xml Schema Collection. Validation Type property specifies what type of validation the reader should perform. To read XML data from an Xml Node, use Xml Node Reader.