(VB.NET) Iterate over Direct Child Nodes by Index

Demonstrates some ways to iterate over direct child nodes by index.

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

<root>
    <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>
</root>

Download: Chilkat .NET Assemblies

Dim xml As New Chilkat.Xml()
Dim child As Chilkat.Xml

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


'  The NumChildren property contains the number of direct
'  child nodes.  Note: The child nodes under "xyz" are NOT
'  direct children of "root".  Therefore, the "root" node has
'  7 direct children
TextBox1.Text = TextBox1.Text & "NumChildren = " _
     & xml.NumChildren & vbCrLf

'  Iterate over the direct children by index. The first child
'  is at index 0.
Dim i As Long
For i = 0 To xml.NumChildren - 1
    '   access the tag and content directly by index:
    TextBox1.Text = TextBox1.Text & i & ": " _
         & xml.GetChildTagByIndex(i) & " : " & xml.GetChildContentByIndex(i) & vbCrLf

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

'  Do the same as the above loop, but get the child node
'  and access the Tag and Content properties:
For i = 0 To xml.NumChildren - 1
    child = xml.GetChild(i)
    TextBox1.Text = TextBox1.Text & i & ": " _
         & child.Tag & " : " & child.Content & vbCrLf

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

'  Do the same as the above loop, but instead of creating
'  a new object instance for each child, call GetChild2 to
'  update the object's reference instead.
For i = 0 To xml.NumChildren - 1
    '  Navigate to the Nth child.
    xml.GetChild2(i)
    TextBox1.Text = TextBox1.Text & i & ": " _
         & xml.Tag & " : " & xml.Content & vbCrLf
    '  Navigate back up to the parent:
    xml.GetParent2()
Next
TextBox1.Text = TextBox1.Text & "-----" & vbCrLf

'  Notice that the Content of the "xyz" node is empty.  This is correct.
'  The "xyz" node has no Content, but 2 direct children.