绑定到ResourceDictionary XAML中DataTemplate中的ContextMenuOpening

Question

I have a ResourceDictionary that contains a <DataTemplate> with a <TextBox> in it. The problem is how to use a binding to connect the ContextMenuOpening event of the TextBox . I have tried creating a DependencyProperty through DependencyProperty.Register with a name that matches the Binding in the ContextMenuOpening event, but at runtime the error is:

A 'Binding' cannot be set on the 'AddContextMenuOpeningHandler' property of type 'TextBox'. A 'Binding' can only be set on a DependencyProperty of a DependencyObject.

ResourceDictionary XAML:

<DataTemplate>
   <Grid>
       <TextBox ContextMenuOpening="{Binding ??WHAT GOES HERE?? }"  />
   </Grid>       
</DataTemplate>

Is what I'm trying to do even possible because of the XAML being in the ResourceDictionary rather than in the XAML of a UserControl?

Answer 1

Is what I'm trying to do even possible because of the XAML being in the ResourceDictionary rather than in the XAML of a UserControl?

Yes, you could add a code-behind file to a ResourceDictionary as described here:

Is it possible to set code behind a resource dictionary in WPF for event handling?

Once you have added the code-behind file you could handle the event as usual:

<TextBox ContextMenuOpening="TextBox_ContextMenuOpening"  />

---

private void TextBox_ContextMenuOpening(object sender, ContextMenuEventArgs e)
{
    //do your thing...
}