(VB.NET) XML SearchForAttribute Method

Demonstrates the SearchForAttribute method.

The input XML, available at http://www.chilkatsoft.com/data/fruitSearch.xml, is this:

<root>
    <searchRoot>
        <fruit color="red">apple</fruit>
        <fruit color="green">pear</fruit>
        <veg color="orange">carrot</veg>
        <meat animal="cow">beef</meat>
        <xyz>
            <fruit color="blue">blueberry</fruit>
            <veg color="green">broccoli</veg>
        </xyz>
        <fruit color="purple">grape</fruit>
        <cheese color="yellow">cheddar</cheese>
    </searchRoot>
    <fruit color="red">strawberry</fruit>
    <fruit color="orange">peach</fruit>
    <root></root>
</root>

Download: Chilkat .NET Assemblies

Dim xml As New Chilkat.Xml()
Dim xSearchRoot As Chilkat.Xml
Dim xBeginAfter As Chilkat.Xml
Dim xFound As Chilkat.Xml

Dim success As Boolean
'  The sample input XML is available at http://www.chilkatsoft.com/data/fruitSearch.xml
success = xml.LoadXmlFile("fruitSearch.xml")
If (success <> true) Then
    TextBox1.Text = TextBox1.Text & xml.LastErrorText & vbCrLf
    Exit Sub
End If


'  Search the sub-tree rooted at "searchRoot"
xSearchRoot = xml.FindChild("searchRoot")

'  Search for all "fruit" nodes having a color attribute
'  where the name of the color ends in "e"
xBeginAfter = Nothing
xFound = xSearchRoot.SearchForAttribute(xBeginAfter,"fruit","color","*e")
While Not (xFound Is Nothing )

    TextBox1.Text = TextBox1.Text & xFound.Content _
         & ": " & xFound.GetAttrValue("color") & vbCrLf


    xBeginAfter = xFound
    xFound = xSearchRoot.SearchForAttribute(xBeginAfter,"fruit","color","*e")
End While

'  The correct output is:
'  grape: purple
'  blueberry: blue



TextBox1.Text = TextBox1.Text & "--------------------------" & vbCrLf

'  ---------------------------------------------------------------------------------
'  Now do the same, but instead use SearchForAttribute2
'  which updates the internal reference of the caller instead
'  of returning the found node.
Dim xSearch As Chilkat.Xml

xBeginAfter = xSearchRoot.GetSelf()
xSearch = xSearchRoot.GetSelf()

success = xSearch.SearchForAttribute2(xBeginAfter,"fruit","color","*e")
While success = true

    TextBox1.Text = TextBox1.Text & xSearch.Content _
         & ": " & xSearch.GetAttrValue("color") & vbCrLf

    '  Copy the internal references so that the next search
    '  begins after the found node.
    xBeginAfter.CopyRef(xSearch)
    xSearch.CopyRef(xSearchRoot)

    success = xSearch.SearchForAttribute2(xBeginAfter,"fruit","color","*e")
End While