XPathResultType.Number : XPath « XML « VB.Net






XPathResultType.Number

  
Imports System
Imports System.Xml
Imports System.Xml.XPath

Public Class MainClass

    Public Shared Sub Main()
        Dim document As XPathDocument = New XPathDocument("contosoBooks.xml")
        Dim navigator As XPathNavigator = document.CreateNavigator()

        Dim expression1 As XPathExpression = XPathExpression.Compile(".//bk:price/text()*10")  ' Returns a number.
        Dim expression2 As XPathExpression = XPathExpression.Compile("bk:bookstore/bk:book/bk:price")  ' Returns a nodeset.

        Dim manager As XmlNamespaceManager = New XmlNamespaceManager(navigator.NameTable)
        manager.AddNamespace("bk", "http://www.yourname.com/books")

        expression1.SetContext(manager)
        expression2.SetContext(manager)

        Evaluate(expression1, navigator)
        Evaluate(expression2, navigator)

    End Sub

    Public Shared Sub Evaluate(ByVal expression As XPathExpression, ByVal navigator As XPathNavigator)

        Select Case expression.ReturnType
            Case XPathResultType.Number
                Console.WriteLine(navigator.Evaluate(expression))
                Exit Sub

        End Select

    End Sub
End Class

'<bookstore xmlns="http://www.yourname.com/books">
'    <book genre="autobiography" publicationdate="1999-12-12" ISBN="1-111111-11-1">
'        <title>A</title>
'        <author>
'            <first-name>X</first-name>
'            <last-name>Y</last-name>
'        </author>
'        <price>8.99</price>
'    </book>
'    <book genre="novel" publicationdate="2000-01-01" ISBN="0-201-63361-2">
'        <title>Java</title>
'        <author>
'            <first-name>Q</first-name>
'            <last-name>Q</last-name>
'        </author>
'        <price>11.99</price>
'    </book>
'    <book genre="philosophy" publicationdate="1991-02-15" ISBN="1-861001-57-6">
'        <title>C#</title>
'        <author>
'            <name>Author</name>
'        </author>
'        <price>9.99</price>
'    </book>
'</bookstore>

   
    
  








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1.Use XPath to do a 'select' commandUse XPath to do a 'select' command
2.Using XPathNavigator to select single node
3.XPathResultType.NodeSet
4.XPathResultType.Boolean
5.XPathResultType.String
6.Use the XPath return type to determine how to process the XPath expression