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POBinding in multiple views to ObservableCollection of selected items (MVVM, SL5)
 

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  1. POBinding in multiple views to ObservableCollection of selected items (MVVM, SL5)
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    <p>I'm using MVVM with Silverlight 5. What I want to achieve is to select items in a <code>ListBox</code> in one view (e.g. ListView.xaml) and display the selected items in a <code>ListBox</code> in another view (e.g. SelectionView.xaml).</p> <p>My selected items are in an <code>ObservableCollection&lt;MyItem&gt;</code> (called <code>SelectedItems</code>) that is created via attached behaviour as described <a href="https://stackoverflow.com/questions/1297643/sync-selecteditems-in-a-muliselect-listbox-with-a-collection-in-viewmodel">in this answer</a></p> <p>The problem seems to be that I am using two different XAML files. If I bind a <code>ListBox</code> to <code>SelectedItems</code> in the same XAML file where the selection happens, the items show up in another <code>ListBox</code> in the same view without problems. But in a different file, the <code>ListBox</code> stays empty.</p> <p>Both views use the same <code>ViewModel</code> as DataContext.</p> <p>I would be very happy about some pointers in the right direction. I'm new to SL so perhaps I'm missing something obvious.</p> <p>This is the code that works:</p> <p>ListView.xaml</p> <pre><code>&lt;UserControl x:Class="Silverlight5App.View.Content.ListView" xmlns:viewModel="clr-namespace:Silverlight5App.ViewModel" xmlns:behaviours="clr-namespace:Silverlight5App.Behaviours"&gt; &lt;UserControl.Resources&gt; &lt;viewModel:XYPlotViewModel x:Key="ViewModelTest" /&gt; &lt;/UserControl.Resources&gt; &lt;Grid x:Name="LayoutRoot" DataContext="{Binding Source={StaticResource ViewModelTest}}"&gt; &lt;StackPanel&gt; &lt;ListBox ItemsSource="{Binding Path=XYPoints}" behaviours:SelectedItems.Items="{Binding SelectedItems}" Name="XYPointsListbox" SelectionMode="Extended" &gt; &lt;ListBox.ItemTemplate&gt; &lt;DataTemplate&gt; &lt;Grid&gt; &lt;Grid.ColumnDefinitions&gt; &lt;ColumnDefinition Width="100" /&gt; &lt;ColumnDefinition Width="100" /&gt; &lt;ColumnDefinition Width="100" /&gt; &lt;/Grid.ColumnDefinitions&gt; &lt;TextBlock Grid.Column="0" Margin="2" Text="{Binding id}" /&gt; &lt;TextBlock Grid.Column="1" Margin="2" Text="{Binding x}" /&gt; &lt;TextBlock Grid.Column="2" Margin="2" Text="{Binding y}" /&gt; &lt;/Grid&gt; &lt;/DataTemplate&gt; &lt;/ListBox.ItemTemplate&gt; &lt;/ListBox&gt; &lt;ListBox ItemsSource="{Binding SelectedItems}" Name="XYPointsListboxSelection"&gt; &lt;ListBox.ItemTemplate&gt; &lt;DataTemplate&gt; &lt;Grid&gt; &lt;Grid.ColumnDefinitions&gt; &lt;ColumnDefinition Width="100" /&gt; &lt;ColumnDefinition Width="100" /&gt; &lt;ColumnDefinition Width="100" /&gt; &lt;/Grid.ColumnDefinitions&gt; &lt;TextBlock Grid.Column="0" Margin="2" Text="{Binding id}" /&gt; &lt;TextBlock Grid.Column="1" Margin="2" Text="{Binding x}" /&gt; &lt;TextBlock Grid.Column="2" Margin="2" Text="{Binding y}" /&gt; &lt;/Grid&gt; &lt;/DataTemplate&gt; &lt;/ListBox.ItemTemplate&gt; &lt;/ListBox&gt; &lt;/StackPanel&gt; &lt;/Grid&gt; &lt;/UserControl&gt; </code></pre> <p>and this code just gives an empty listbox:</p> <p>SelectionView.xaml</p> <pre><code> &lt;UserControl x:Class="Silverlight5App.View.Content.SelectionView" xmlns:viewModel="clr-namespace:Silverlight5App.ViewModel" xmlns:behaviours="clr-namespace:Silverlight5App.Behaviours"&gt; &lt;UserControl.Resources&gt; &lt;viewModel:XYPlotViewModel x:Key="ViewModelTest" /&gt; &lt;/UserControl.Resources&gt; &lt;Grid x:Name="LayoutRoot" DataContext="{Binding Source={StaticResource ViewModelTest}}" &gt; &lt;StackPanel&gt; &lt;ListBox ItemsSource="{Binding Path=SelectedItems}" Name="XYPointsListboxSelection2"&gt; &lt;ListBox.ItemTemplate&gt; &lt;DataTemplate&gt; &lt;Grid&gt; &lt;Grid.ColumnDefinitions&gt; &lt;ColumnDefinition Width="100" /&gt; &lt;ColumnDefinition Width="100" /&gt; &lt;ColumnDefinition Width="100" /&gt; &lt;/Grid.ColumnDefinitions&gt; &lt;TextBlock Grid.Column="0" Margin="2" Text="{Binding id}" /&gt; &lt;TextBlock Grid.Column="1" Margin="2" Text="{Binding x}" /&gt; &lt;TextBlock Grid.Column="2" Margin="2" Text="{Binding y}" /&gt; &lt;/Grid&gt; &lt;/DataTemplate&gt; &lt;/ListBox.ItemTemplate&gt; &lt;/ListBox&gt; &lt;/StackPanel&gt; &lt;/Grid&gt; &lt;/UserControl&gt; </code></pre> <p>PS: syntax highlighting is set to language-all: lang-xml but doesn't seem to work?</p>
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