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POAccess my Views from bound ItemsControl
 

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    <p>I have a typical MVVM scenario: I have an <code>ItemsControl</code> bound to an <code>ObservableCollection</code> of StepsViewModels. I define a DataTemplate so that StepViewModels are rendered as StepViews. The same happens in the StepView: I have an <code>ItemsControl</code> to an <code>ObservableCollection</code> of ParameterViewModels with a DataTemplate to render them as ParameterViews.</p> <p>My problem is: I have to refresh the <code>ItemsControl</code> to render items added and remove items. I can refresh the <code>ItemsControl</code> with StepViews, because I have access to it and can call ItemsControl.Items.Refresh(). But how can I access the StepViews so I can call a Refresh method? ItemsControl Items are StepViewModels...</p> <p>Here is the code:</p> <pre><code>&lt;UserControl x:Class="mylib.EditorView" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:my="clr-namespace:mylib"&gt; &lt;UserControl.Resources&gt; &lt;DataTemplate DataType="{x:Type my:StepViewModel}"&gt; &lt;my:StepView HorizontalAlignment="Stretch"/&gt; &lt;/DataTemplate&gt; &lt;/UserControl.Resources&gt; &lt;Grid&gt; &lt;Grid.RowDefinitions&gt; &lt;RowDefinition Height="27"/&gt; &lt;RowDefinition Height="*"/&gt; &lt;/Grid.RowDefinitions&gt; &lt;ScrollViewer VerticalScrollBarVisibility="Auto" Grid.Row="1" VerticalAlignment="Top"&gt; &lt;StackPanel Orientation="Vertical"&gt; &lt;TextBlock Name="lblHelpRefresh" Margin="0 7 0 7" Visibility="{Binding HelpVisible}" VerticalAlignment="Center" HorizontalAlignment="Center" FontSize="9pt" Foreground="#949494" Text="Please click refresh to reload this list"/&gt; &lt;ItemsControl Name="stkStepContent" ItemsSource="{Binding Steps}"/&gt; &lt;/StackPanel&gt; &lt;/ScrollViewer&gt; &lt;/Grid&gt; &lt;/UserControl&gt; </code></pre> <p>How can I access the StepView controls that render the stkStepContent Items?</p>
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    1. COIf you use ObservableCollections there's usually no need to explicitly refresh; the bindings detect when the collection has changed and update themselves.
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      1. USAlex Paven
    2. COI'm pretty much sure that `ItemsControl` needs an explicit Refresh to update the render. The ItemsControl ItemsSource is binded to an ObservableCollection and the refresh is needed.
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    3. COAs Alex said - if you're using ObservableCollection you shouldn't need to refresh.
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      1. USGrokys
 

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