re-referencing xml data to combobox in silverlight

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Hi All,

I'm stumped with this one.

on my silvelrght app, I have 2 comboboxes, that are supposed to populate from an xml data sheet. So lets say here's a data sample:

XML

<model name="Accord 4DR">
    <code name="CP2E6CE" />
    <code name="CP2F6CE" />
    <code name="CP2F7CJ" />
    <code name="CP2F8CJN" />
    <code name="CP2F8CKN" />
    <code name="CP3F8CJN" />
    <code name="CP3F8CKN" />
  </model>

  <model name="Civic 2DR">
    <code name="FG3A4CE" />
    <code name="FG3B4CE" />
    <code name="FG3A5CJ" />
    <code name="FG3B5CJ" />
    <code name="FG3B9CKN" />
    <code name="FG4A5CK" />
  </model>

For the first combobox, it populates likes this:

C#

protected override void OnNavigatedTo(NavigationEventArgs e)
       {

           XDocument xml = XDocument.Load("modelcodes.xml");
           foreach (XElement element in xml.Descendants("model"))
           {
             CarTypeCB.Items.Add(element.FirstAttribute.Value);
           }
       }

Now, the second combobox needs to populate with the descendants of whatever selection I make on SelectionChanged of the first combobox. I cant figure out what the right syntax is for basically using the SelectedItem.Value to tell it where to get the descendants from. I want to do something similar so, id say something like:

C#

private void CarTypeCB_SelectionChanged(object sender, SelectionChangedEventArgs e)
       {
           ModelCodeCB.IsEnabled = true;
           XDocument xml = XDocument.Load("modelcodes.xml");

           var query = from selection in xml.Descendants("model")
                       where (string)selection == (ModelCodeCB.SelectedValue)
                       from codes in selection.Elements("code")
                       select codes;

           foreach (XElement codes in query.Descendants("code"))
           {
               ModelCodeCB.Items.Add(codes.FirstAttribute.Value);
           }
       }

but it doesnt seem to respond and it doesn't populate the combobox. What would the proper syntax be?

Posted 29-Jul-12 14:22pm

Taysseer Kadri

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Christian Amado · Answer 1 · 2012-07-29T17:19:00

C#

private void CarTypeCB_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            ModelCodeCB.IsEnabled = true;
            XDocument xml = XDocument.Load("modelcodes.xml");
 
            var query = from selection in xml.Descendants("model")
                        where (string)selection == (ModelCodeCB.SelectedValue)
                        from codes in selection.Elements("code")
                        select codes;
             
            foreach (XElement codes in query.Descendants("code"))
            {
                ModelCodeCB.Items.Add(codes.FirstAttribute.Value);
            }
        }

Try to replace for this:

C#

private void CarTypeCB_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            ModelCodeCB.IsEnabled = true;
            XDocument xml = XDocument.Load("modelcodes.xml");
 
            var query = from selection in xml.Descendants("model")
                        where (string)selection == (ModelCodeCB.SelectedValue.ToString())
                        from codes in selection.Elements("code")
                        select codes;
             
            foreach (XElement codes in query)
            {
                ModelCodeCB.Items.Add(codes.FirstAttribute.Value);
            }
        }

Hope it helps.