How to Bind WPF UI Events to ViewModel Commands?

Bind UI events to ViewModel commands in WPF

When refactoring your application to follow the MVVM pattern, it becomes critical to move UI event handling from the code-behind to the ViewModel. Understanding how to bind UI events to commands is critical to implementing MVVM effectively.

To do this, consider using the EventTrigger class in the Windows.Interactivity namespace in conjunction with the InvokeCommandAction class. Here is an example:

<code class="language-xml"><ListBox ...>
  <i:Interaction.Triggers>
    <i:EventTrigger EventName="SelectionChanged">
      <i:InvokeCommandAction Command="{Binding SelectedItemChangedCommand}" />
    </i:EventTrigger>
  </i:Interaction.Triggers>
</ListBox></code>

This method allows you to bind the SelectionChanged event directly to the command defined in the ViewModel. You can use the EventTrigger and InvokeCommandAction classes by referencing System.Windows.Interactivity in your project.

Remember to use "xmlns:i="clr-namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity" to set the appropriate namespace. This technology allows you to seamlessly bind UI events to ViewModel commands, thereby enhancing separation of concerns and following the MVVM architectural pattern.

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