Mega Code Archive
Optimizing XmlReader with a NameTable (VB)
<![CDATA[
<%@ Page Language="VB" AutoEventWireup="false" CodeFile="Default.aspx.vb" Inherits="_Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>Untitled Page</title>
</head>
<body>
<form id="form1" runat="server">
<div>
</div>
</form>
</body>
</html>
File: Default.aspx.vb
Imports System.IO
Imports System.Xml
Imports System.Xml.Schema
Partial Class _Default
Inherits System.Web.UI.Page
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) _
Handles Me.Load
Dim bookcount As Integer = 0
Dim settings As New XmlReaderSettings()
Dim nt As New NameTable()
Dim book As Object = nt.Add("book")
settings.NameTable = nt
Dim booksSchemaFile As String = Path.Combine(Request.PhysicalApplicationPath, "Data.xsd")
settings.Schemas.Add(Nothing, XmlReader.Create(booksSchemaFile))
settings.ValidationType = ValidationType.Schema
settings.ValidationFlags = XmlSchemaValidationFlags.ReportValidationWarnings
AddHandler settings.ValidationEventHandler, AddressOf settings_ValidationEventHandler
settings.IgnoreWhitespace = True
settings.IgnoreComments = True
Dim booksFile As String = _
Path.Combine(Request.PhysicalApplicationPath, "Data.xml")
Using reader As XmlReader = XmlReader.Create(booksFile, settings)
While (reader.Read())
If (reader.NodeType = XmlNodeType.Element _
And book.Equals(reader.LocalName)) Then
bookcount += 1
End If
End While
End Using
Response.Write(String.Format("Found {0} books!", bookcount))
End Sub
Sub settings_ValidationEventHandler(ByVal sender As Object, _
ByVal e As System.Xml.Schema.ValidationEventArgs)
Response.Write(e.Message)
End Sub
End Class
File: Data.xml
<?xml version='1.0'?>
<bookstore xmlns="http://example.books.com"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<book genre="A"
publicationdate="1981"
ISBN="1-11111-11-0">
<title>title 1</title>
<author>
<first-name>A</first-name>
<last-name>B</last-name>
</author>
<price>8</price>
</book>
<book genre="B"
publicationdate="1999"
ISBN="0-222-22222-2">
<title>title 2</title>
<author>
<first-name>C</first-name>
<last-name>D</last-name>
</author>
<price>11.99</price>
</book>
</bookstore>
File: Data.xsd
<?xml version="1.0" encoding="utf-8"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:tns="http://example.books.com" xmlns="http://example.books.com" targetNamespace="http://example.books.com" elementFormDefault="qualified">
<xsd:element name="bookstore" type="bookstoreType" />
<xsd:complexType name="bookstoreType">
<xsd:sequence maxOccurs="unbounded">
<xsd:element name="book" type="bookType" />
</xsd:sequence>
</xsd:complexType>
<xsd:complexType name="bookType">
<xsd:sequence>
<xsd:element name="title" type="xsd:string" />
<xsd:element name="author" type="authorName" />
<xsd:element name="price" type="xsd:decimal" />
</xsd:sequence>
<xsd:attribute name="genre" type="xsd:string" />
<xsd:attribute name="publicationdate" type="xsd:string" />
<xsd:attribute name="ISBN" type="xsd:string" />
</xsd:complexType>
<xsd:complexType name="authorName">
<xsd:sequence>
<xsd:element name="first-name" type="xsd:string" />
<xsd:element name="last-name" type="xsd:string" />
</xsd:sequence>
</xsd:complexType>
</xsd:schema>
]]>