Cannot parse XML using Xpath

Question

i have problem parsing XML files. I managed to read some sample xml files using xpath but i cannot read my XML file. Whatever i enter as xpath expression, it cannot parse the file.

Here is the xml file i am trying to read

<?xml version="1.0"?>
<WLANProfile xmlns="http://www.microsoft.com/networking/WLAN/profile/v1">
<name>dino</name>
<SSIDConfig>
   <SSID>
      <hex>64696E6F</hex>
      <name>dino</name>
   </SSID>
</SSIDConfig>
<connectionType>ESS</connectionType>
<connectionMode>auto</connectionMode>
<MSM>
   <security>
      <authEncryption>
         <authentication>open</authentication>
         <encryption>WEP</encryption>
         <useOneX>false</useOneX>
      </authEncryption>
      <sharedKey>
         <keyType>networkKey</keyType>
         <protected>true</protected>
         <keyMaterial>01000000D08C9DDF0115D1118C7A00C04FC297EB010000000C046798E62AF24993A8197E7DBF7BDC00000000020000000000106600000001000020000000E64B73274BEAB7199AB89DB1CFED12146D88E9B5EF36823E780F33E9B67E2CDC000000000E80000000020000200000002BF0125DD33F628A7D7B1C867298C62DEF53C6712E8ED4051491F317B0A1710A100000003748D54F3C408A3E076006C03174B10440000000BF822418926AF8663A6FE9619C34C765009EB9D8B23104FEBE049EB1E5B96F8BD61D3E8056885958616E5C50CE9FDF6DC4517B4405C0C45EA392327964301508</keyMaterial>
      </sharedKey>
   </security>
</MSM>
</WLANProfile>

For example, i want to get keyMaterial. This is the code

string fileloc = String.Format("{0}/dino.xml", destination);

        label3.Text = fileloc; // path check

        XPathDocument doc = new XPathDocument(fileloc);
        XPathNavigator nav = doc.CreateNavigator();

        XPathExpression expr;
        expr = nav.Compile("/WLANProfile/MSM/security/sharedKey/keyMaterial");
        XPathNodeIterator iterator = nav.Select(expr);

        listBox1.Items.Clear();
        try
        {
            while (iterator.MoveNext())
            {
                XPathNavigator nav2 = iterator.Current.Clone();
                listBox1.Items.Add("keyMaterial: " + nav2.Value);
            }
        }
        catch (Exception ex)
        {
            label2.Text = ex.Message;

So, where is the problem? listBox is empty whatever i enter as nav.Compile.

I would like to use xPath. If we can't get it to parse, then i will use XDocument. — nighthawk
– nighthawk, Commented Mar 22, 2012 at 15:34
Try to add namespace to expression. It looks like lack of namespace casing the problem — Marcin
– Marcin, Commented Mar 22, 2012 at 16:41

Marcin · Accepted Answer · 2012-03-22 16:51:26Z

1

Try following with your code, I've checked and it is working:

XPathDocument doc = new XPathDocument(fileloc);
XPathNavigator nav = doc.CreateNavigator();

XmlNamespaceManager manager = new XmlNamespaceManager(nav.NameTable);
manager.AddNamespace("bk", "http://www.microsoft.com/networking/WLAN/profile/v1");


XPathNodeIterator iterator = nav.Select("/bk:WLANProfile/bk:MSM/bk:security/bk:sharedKey/bk:keyMaterial", manager);

answered Mar 22, 2012 at 16:51

Marcin

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L.B · Accepted Answer · 2012-03-22 15:12:08Z

1

If you want to use XDocument

XDocument xDoc = XDocument.Load(.....);
XNamespace ns = XNamespace.Get("http://www.microsoft.com/networking/WLAN/profile/v1");
var key = xDoc.Descendants(ns+"keyMaterial").First();

answered Mar 22, 2012 at 15:12

L.B

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1 Comment

nighthawk Over a year ago

I was getting some errors later so i added First.Value. Now works fine but i will use xpath.

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