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POWPF binding Ancestor object as CommandParameter
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  1. POWPF binding Ancestor object as CommandParameter
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    copied!<p>I have a Custom usercontrol that I want to enlarge. I tested this whit a function call on MouseDoubleClick and it worked fine. Code:</p> <pre><code>XAML &lt;cc:UserControl ItemsSource="{Binding Path=DataItem}" MouseDoubleClick="UserControl_MouseDoubleClick" /&gt; CodeBehind c# private void UserControl_MouseDoubleClick(object sender, MouseButtonEventArgs e) { MainWindowViewModel.Instance.LightBoxCommand.Execute(sender); } </code></pre> <p>Now i want to do it with MVVM pattern and in a menu like this:</p> <pre><code>XAML &lt;cc:UserControl ItemsSource="{Binding Path=DataItem}" MouseDoubleClick="UserControl_MouseDoubleClick" &gt; &lt;cc:UserControl.ContextMenu&gt; &lt;ContextMenu&gt; &lt;MenuItem Header="_Enlarge" Command="{Binding Path=EnlargeCommand, RelativeSource={RelativeSource AncestorType={x:Type cc:UserControl}}}" CommandParameter="{Binding Path=.}" /&gt; &lt;/MenuItem&gt; &lt;/ContextMenu&gt; &lt;/cc:UserControl.ContextMenu&gt; &lt;/cc:UserControl&gt; MVVM C# private ICommand _enlargeCommand; public ICommand EnlargeCommand { get { if (_enlargeCommand == null) _enlargeCommand = new RelayCommand(n =&gt; {MainWindowViewModel.Instance.LightBoxCommand.Execute(n); }); return _enlargeCommand; } } </code></pre> <p>The problem is that I'm not quite sure how to bind to the parent object, i want to send the whole UserControl to the "LightBoxCommand". Any ideas? </p> <p>c# Lightboxcommand</p> <pre><code>public Visibility LightBoxVisible { get; set; } public bool IsLightBoxVisible { get; set; } public UserControl CurrentLightBoxItem { get; set; } private ICommand _lightBoxCommand; public ICommand LightBoxCommand { get { if (_lightBoxCommand == null) _lightBoxCommand = new RelayCommand(n =&gt; { if (IsLightBoxVisible == true) LightBoxVisible = Visibility.Hidden; else { LightBoxVisible = Visibility.Visible; CurrentLightBoxItem = ((UserControl)n).Copy(); NotifyPropertyChanged("CurrentLightBoxItem"); } IsLightBoxVisible = !IsLightBoxVisible; NotifyPropertyChanged("LightBoxVisible"); }); return _lightBoxCommand; } } </code></pre>
 

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