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POBinding ComboBox with LINQ XML
 

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    <p>Excuse me for my poor English, that is not my native language.</p> <p>I'm a beginner (since 3 days) with WPF and LINQ, and a casual user of C#.</p> <p>Yesterday, i've trying all the day to solve my probleme and read several documentation, but a bug in my code persist.</p> <p>I pass a XElement to a control who bind its content, but i've a but in the ComboBox</p> <p>Here is the XML of the XElement :</p> <pre><code>&lt;racine&gt; &lt;element nom="Element 1"&gt; &lt;rubrique nom="Element 1 - rubrique 1"&gt; &lt;etat valeur="Hors service"&gt; &lt;option valeur="En service" /&gt; &lt;option valeur="Hors service service" /&gt; &lt;/etat&gt; &lt;observation&gt;lorem ipsum&lt;/observation&gt; &lt;/rubrique&gt; &lt;rubrique nom="Element 1 - rubrique 2"&gt; &lt;etat&gt; &lt;/etat&gt; &lt;observation&gt;titi toto&lt;/observation&gt; &lt;/rubrique&gt; &lt;/element&gt; &lt;element nom="Element 2"&gt; &lt;rubrique nom="Element 2 - rubrique 1"&gt; &lt;etat valeur="foo"&gt; &lt;/etat&gt; &lt;observation&gt;youpi&lt;/observation&gt; &lt;/rubrique&gt; &lt;rubrique nom="Element 2 - rubrique 2"&gt; &lt;etat valeur="bar"&gt; &lt;option valeur="En service" /&gt; &lt;/etat&gt; &lt;observation&gt;&lt;/observation&gt; &lt;/rubrique&gt; &lt;/element&gt; &lt;/racine&gt; </code></pre> <p>Here is the code behind of my control MonControle.xaml.cs :</p> <pre><code>using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Windows; using System.Windows.Controls; using System.Windows.Data; using System.Windows.Documents; using System.Windows.Input; using System.Windows.Media; using System.Windows.Media.Imaging; using System.Windows.Navigation; using System.Windows.Shapes; using System.Xml.Linq; using System.ComponentModel; using System.Collections.ObjectModel; using System.Collections.Specialized; namespace MonProjet.Controles { /// &lt;summary&gt; /// Logique d'interaction pour MonControle.xaml /// &lt;/summary&gt; public partial class MonControle : UserControl { XElement xRacine; ObservableCollection&lt;XElement&gt; xElementsObservable = new ObservableCollection&lt;XElement&gt;(); public MonControle() { InitializeComponent(); DataContext = xElementsObservable; } #region Propriété Attribus [Category("Configuration"), Browsable(false), Description("Element XML racine")] public XElement xRacine { get { return xRacine; } set { this.xRacine = value; MajXElementsObservable(); } } #endregion private void MajXElementsObservable() { var requette = from xElements in xRacine.Descendants("element") select (XElement)xElements; xElementsObservable.Clear(); foreach (XElement xElement in requette) { xElementsObservable.Add(xElement); } } } } </code></pre> <p>And here is the xaml for MonControle.xaml :</p> <pre><code>&lt;UserControl x:Class="MonProjet.Controles.MonControle" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Height="Auto" Width="Auto"&gt; &lt;!-- http://www.youdev.net/post/2008/09/23/WPF-SplitContainer-2.aspx http://www.youdev.net/post/2009/03/19/WPF-SplitContainer-Part-2.aspx --&gt; &lt;Grid&gt; &lt;Grid.ColumnDefinitions&gt; &lt;ColumnDefinition Width="25*"/&gt; &lt;ColumnDefinition Width="Auto" MinWidth="4"/&gt; &lt;ColumnDefinition Width="75*"/&gt; &lt;/Grid.ColumnDefinitions&gt; &lt;DockPanel Grid.Column="0" LastChildFill="True"&gt; &lt;ListBox Name="lbxElements" ItemsSource="{Binding UpdateSourceTrigger=PropertyChanged}" DisplayMemberPath="Attribute[nom].Value" /&gt; &lt;/DockPanel&gt; &lt;GridSplitter Grid.Column="1" ResizeBehavior="PreviousAndNext" Width="4" VerticalAlignment="Stretch"/&gt; &lt;DockPanel Grid.Column="2" LastChildFill="True" DataContext="{Binding Path=SelectedItem.Elements[rubrique], ElementName=lbxElements, UpdateSourceTrigger=PropertyChanged}"&gt; &lt;ListBox ItemsSource="{Binding UpdateSourceTrigger=PropertyChanged}" IsSynchronizedWithCurrentItem="True"&gt; &lt;ListBox.ItemTemplate&gt; &lt;DataTemplate&gt; &lt;GroupBox Header="{Binding Path=Attribute[nom].Value}"&gt; &lt;StackPanel Orientation="Horizontal"&gt; &lt;!-- http://stackoverflow.com/questions/561166/binding-wpf-combobox-to-a-custom-list --&gt; &lt;ComboBox MinWidth="75" IsEditable="True" ItemsSource="{Binding Path=Element[etat].Elements[option], UpdateSourceTrigger=PropertyChanged}" DisplayMemberPath="Attribute[valeur].Value" SelectedValuePath="Attribute[valeur].Value" SelectedValue="{Binding Path=Element[etat].Element[option].Attribute[valeur].Value}" /&gt; &lt;TextBox MinWidth="150" AcceptsReturn="False" AcceptsTab="False" TextWrapping="NoWrap" Text="{Binding Path=Element[observation].Value, UpdateSourceTrigger=PropertyChanged}" /&gt; &lt;/StackPanel&gt; &lt;/GroupBox&gt; &lt;/DataTemplate&gt; &lt;/ListBox.ItemTemplate&gt; &lt;/ListBox&gt; &lt;/DockPanel&gt; &lt;/Grid&gt; &lt;/UserControl&gt; </code></pre> <p>My questions are :</p> <ul> <li><p>When the control load, it's ok, but if I switch betwen element in the left ListBox, value of the ComboBox change... A try many thing, do a lot of test, but impossible to fix it !</p></li> <li><p>Impossible to enter value who are not in the list of , but i want be able to do it. As well, I do many test, but I can't solve the problem</p></li> <li><p>Last but not least : i want rise a event when the ObservableCollection is changed for write the XML file, but impossible to catch an event... I've tried something like xElementsObservable.CollectionChanged += new NotifyCollectionChangedEventHandler(XElementsObservable_CollectionChanged); but it do not work...</p></li> </ul> <p>Thanks by advance for your help !</p>
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