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POMVVM WPF ObservableCollection : Error addign items, ItemsSource binding
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  1. POMVVM WPF ObservableCollection : Error addign items, ItemsSource binding
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    copied!<p>I'm having troubles adding items to an ObservableCollection while using a listbox with ItemsSource. I add dummy data for testing in my viewmodels constructor.</p> <p>My viewmodel: </p> <pre><code>public class KabaDeviceListViewModel : KabaBase { private ObservableCollection&lt;KabaDeviceDetailViewModel&gt; _details; public ObservableCollection&lt;KabaDeviceDetailViewModel&gt; KabaDevices { get { return _details; } set { if (value != _details) { _details = value; OnPropertyChanged("KabaDevices"); } } } public KabaDeviceListViewModel() { ObservableCollection&lt;KabaDeviceDetailViewModel&gt; _details = new ObservableCollection&lt;KabaDeviceDetailViewModel&gt;(); KabaDevice kd1 = new KabaDevice("localhost A", "127.0.0.1", true); KabaDeviceDetailViewModel dvm = new KabaDeviceDetailViewModel(kd1); _details.Add(dvm); KabaDevice kd2 = new KabaDevice("localhost B", "127.0.0.1", true); KabaDeviceDetailViewModel dvm2 = new KabaDeviceDetailViewModel(kd2); _details.Add(dvm2); this.KabaDevices = _details; } } </code></pre> <p>So far so good, but an error occurs in XAML code here, on ItemsSource of the listbox. I don't see what I'm doing wrong. I use VS2010 and .NET 4.0.</p> <pre><code>&lt;UserControl x:Class="KabaTest.View.KabaDeviceListView" ... xmlns:myViewModels="clr-namespace:KabaTest.ViewModel" xmlns:myViews="clr-namespace:KabaTest.View"&gt; &lt;UserControl.DataContext&gt; &lt;myViewModels:KabaDeviceListViewModel/&gt; &lt;/UserControl.DataContext&gt; &lt;Grid&gt; &lt;ListBox Margin="5" ItemsSource="{Binding Path=KabaDevices, Mode=TwoWay}" &gt; ScrollViewer.HorizontalScrollBarVisibility="Disabled" &gt; &lt;ListBox.ItemsPanel&gt; &lt;ItemsPanelTemplate&gt; &lt;WrapPanel IsItemsHost="True" Orientation="Horizontal" /&gt; &lt;/ItemsPanelTemplate&gt; &lt;/ListBox.ItemsPanel&gt; &lt;ListBox.ItemTemplate&gt; &lt;DataTemplate DataType="{x:Type myViewModels:KabaDeviceDetailViewModel}" &gt; &lt;myViews:KabaDeviceDetailView DataContext="{Binding }"/&gt; &lt;/DataTemplate&gt; &lt;/ListBox.ItemTemplate&gt; &lt;/ListBox&gt; &lt;/Grid&gt; </code></pre> <p></p> <p>The InnerException at ItemsSource is : {"Operation is not valid while ItemsSource is in use. Access and modify elements with ItemsControl.ItemsSource instead."}. Thanks for your help!</p>
 

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