reading elements based on dynamic names, c#, linq to xml, part II

My xml file is set up like this:

<ord>
  <item>
    <sku>123456</sku>
  </item>
</ord>

With the help of kaufMed in another question, I am able to set up a configuration file to tell my application:  You can find item number at <ord><item><sku> then use that information to read my xml file dynamically.,

The code looks like this:

            string itemNo = @"//ord/item/sku";

            try
            {
                foreach (string XMLFileName in FilesIn)
                {
                    XDocument xDoc = XDocument.Load(XMLFileName);

                    foreach (var node in xDoc.XPathSelectElements(itemNo))
                        MessageBox.Show(node.Value);

which successfully returns all the skus in the file.


In reality, a given file will have more than one order, a given order will have more than one item, and descending from the item element, there are other elements besides sku that I need to read.

Is there any way I can enhance the above code to look at a specific occurence of the given node?  Is there any way I can, for example, recognize that I have three orders in the file, then read for each order individually (they do have an order number attribute not shown above, like this:  <ord> OrderNumber=998889), and then look at the item elements within that specific order?

Thanks in advance for any thoughts you might have.
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g_johnsonAsked:
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Pierre FrançoisConnect With a Mentor Senior consultantCommented:
When you compute
xDoc.XPathSelectElements(itemNo)

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you get a list of nodes. You can store that as a variable and count how many nodes it has.

XmlNodeList nodelist = xDoc.XPathSelectElements(itemNo);
MessageBox.Show("Number of orders: " + nodelist.Count.ToString);
foreach (var node in nodelist) { ... ; }

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Instead of parsing the whole list, you can restrict your XPath query to the specific order you want to retrieve. In that case, your XPathSelectElements call could look like
xDoc.XPathSelectElement("//ord/item/sku[2]")

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for selecting the second order. Caution: XPathSelectElement returns a node, XPathSelectElements returns a list of one or more nodes.

Selecting order number 998889 in the way described above happens with next XPath:
xDoc.XPathSelectElements("//ord[contains(text(), "OrderNumber=998889")]/item/sku")

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but this is dangerous: OrderNumber=9988896666 will also be matched. If the XML file had tags like <order number="998889">, the XPath would be more robust and more beautiful:
xDoc.XPathSelectElements("//ord[@number="998889"]/item/sku")

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but since you have no control on the XML structure, this is no more than wishful thinking.
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käµfm³d 👽Commented:
Can you update your example XML to reflect this scenario?
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masterpassConnect With a Mentor Commented:
Have a look here

http://www.java2s.com/Code/CSharp/XML/ReadXMLnodeusingtheXMLpath.htm

using the [@nodeattribute='value'] along with the xpath can solve this issue!

Hope this helps!
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g_johnsonAuthor Commented:
I will be checking out all of the suggestions as soon as I can turn my attention back to this project.  Thanks for your input and patience.
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g_johnsonAuthor Commented:
This helps tremendously and I think will solve my problem.  If not, I will use the looping technique shown by masterpass
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