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POHow to execute command from GridViewItem Tap event (XAML)
 

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  1. POHow to execute command from GridViewItem Tap event (XAML)
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    <p>I am trying to follow the MVVM pattern in my Windows 8.1 store app (XAML).</p> <p>I want to navigate to a new view when a GridViewItem is clicked / tapped in the UI. I wanted to do this without code behind events to promote testability (using MVVM Light).</p> <p>In order to allow my UI to bind to a view model command I have been looking at the Microsoft Behaviors SDK (XAML) added via Add References -> Windows -> Extensions.</p> <p>The following code in my view compiles but blows up when I tap the grid view item. Unfortunately it offers little help &amp; just throws an unhandled win32 exception [3476]. </p> <p>Can somebody please help shed some light on the problem?</p> <p>Namespaces used are;</p> <pre><code>xmlns:interactivity="using:Microsoft.Xaml.Interactivity" xmlns:core="using:Microsoft.Xaml.Interactions.Core" &lt;GridView x:Name="itemGridView" AutomationProperties.AutomationId="ItemGridView" AutomationProperties.Name="Grouped Items" ItemsSource="{Binding Source={StaticResource GroupedSource}}" IsSwipeEnabled="True" IsTapEnabled="True"&gt; &lt;GridView.ItemTemplate&gt; &lt;DataTemplate&gt; &lt;Grid Margin="0" Height="230"&gt; &lt;StackPanel Orientation="Vertical" HorizontalAlignment="Stretch"&gt; &lt;Image Source="{Binding Image}" Stretch="UniformToFill" HorizontalAlignment="Center" VerticalAlignment="Center" /&gt; &lt;StackPanel VerticalAlignment="Bottom" Height="45" Margin="0,-45,0,0"&gt; &lt;StackPanel.Background&gt; &lt;SolidColorBrush Color="Black" Opacity="0.75" /&gt; &lt;/StackPanel.Background&gt; &lt;TextBlock FontSize="16" Margin="2" Text="{Binding Name}" TextWrapping="Wrap" VerticalAlignment="Bottom" /&gt; &lt;/StackPanel&gt; &lt;/StackPanel&gt; &lt;interactivity:Interaction.Behaviors&gt; &lt;core:EventTriggerBehavior EventName="Tapped"&gt; &lt;core:InvokeCommandAction Command="{Binding DataContext.SummaryCatagorySelectedCommand, ElementName=LayoutRoot}" /&gt; &lt;/core:EventTriggerBehavior&gt; &lt;/interactivity:Interaction.Behaviors&gt; &lt;/Grid&gt; &lt;/DataTemplate&gt; &lt;/GridView.ItemTemplate&gt; </code></pre> <p>Edit. As requested, I've added the view model, containing specifically the command I want to fire from my behavior.</p> <pre><code>public class ViewModel : ViewModelBase { public RelayCommand&lt;string&gt; SummaryCatagorySelectedCommand { get; set; } public ViewModel() { // } } </code></pre>
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    1. COSo what is the viewModel and where have you bind with viewmodel with view?
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      1. POHow to execute command from GridViewItem Tap event (XAML)
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