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BOOK: Visual Basic 2005 with .NET 3.0 Programmer's Reference ISBN: 978-0-470-13705-5
This is the forum to discuss the Wrox book Visual Basic 2005 with .NET 3.0 Programmer's Reference by Rod Stephens; ISBN: 9780470137055
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Old January 5th, 2010, 02:40 AM
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Exclamation how to add nodes to an existing xml file using vb.net

hi friends,
I have an xml file and i add a node to it using the following code.

Dim NodeToCreateOrReplace_2 As XmlNodeList = LoadXmlDoc_2.GetElementsByTagName("SB")
Dim NodeToCreateOrReplace As XmlNodeList = LoadXmlDoc.GetElementsByTagName("SB")
Dim newnode As XmlNode, currNode
'XmlNodeList NodeToCreateOrReplace = LoadXmlDoc.GetElementsByTagName(XmlTagNameTxtBx.Te xt);
For Each selectednode As XmlNode In NodeToCreateOrReplace
Dim node As XmlNode = selectednode.SelectSingleNode("SBN")
For Each selectednode1 As XmlNode In LoadXmlDoc_2
Dim node_2 As XmlNode = selectednode.SelectSingleNode("SBN")
If node.InnerText = node_2.InnerText Then
' newnode = LoadXmlDoc.CreateElement("SB")
Dim docFrag As XmlDocumentFragment = doc.CreateDocumentFragment()
docFrag.InnerXml = selectednode1.OuterXml
currNode = LoadXmlDoc.DocumentElement("SBS").SelectSingleNode ("SB")
currNode.InsertAfter(LoadXmlDoc.ImportNode(docFrag , True), currNode.lastChild)

End If

im getting error "The element list has changed. The enumeration operation failed to continue."
please help.
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Old January 5th, 2010, 09:53 AM
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I think that error means that you are modifying the structure over which you are looping. For Each gets confused if the list of objects it's looping over changes while it is trying to loop.

You can avoid that if you convert the For Each loop into a For i loop. Or you can make a separate collection holding the nodes over which you need to loop and then loop through that collection instead of the one that you are modifying.

What are you trying to make the code do?

Rod Stephens, Microsoft MVP

Essential Algorithms: A Practical Approach to Computer Algorithms

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