[2005] How to update XML Innertext on empty node?

[maikeru-sama]

I have nodes that can be empty in my XML Document.

Example:

<mydoc>
<attachment></attachment>
<mydoc>

The attachment node may or may not be empty depending upon if there is an attachment.

How do I update the innertext, as of now the code below throws an null exception:

    Public Sub SetXMLArgsValue(ByVal ConfigName As String, ByVal NewValue As Integer)
        Dim Node As String
        Dim xmlDoc As New XmlDocument
        Dim xmlNode As XmlNode

        Try
            'load document
            xmlDoc.Load(Application.StartupPath & "\Config.xml")
            'set node base
            Node = "/mydoc/" & ConfigName
            'get node
            xmlNode = xmlDoc.SelectSingleNode(Node)
            'get node value
            xmlNode.InnerText = NewValue'<----exception thrown here
            'save 
            xmlDoc.Save(Application.StartupPath & "\Config.xml")
        Catch ex As Exception
            Throw New Exception(ex.Message & " - SetXMLConfigValue")
        Finally
            xmlNode = Nothing
            xmlDoc = Nothing
        End Try
    End Sub

[kleinma]

put a break point on this line:

xmlNode.InnerText = NewValue'<----exception thrown here

then run your code. When the code breaks on that line, add a watch to xmlNode, and make sure that is not is what is null.

There should not be a problem assigning innerttext to a node so long as the node is a valid node.

[maikeru-sama]

kleinma, false alarm. Seems when accessing elements this way, it is "Case Sensitive". I was passing in "GopClosed" and the element in XML is "GOPClosed".

Thanks for the help.

[techgnome]

Just for future reference. XML is and always has been case sensitive. Always. So "when accessing elements this way..." should actually read "when accessing elements in any way..."

-tg