Question

I’m using Silverlight, but I’d be interested in a WPF answer as well

I have a list that is databound to an linked list of “Favorites”. Each favorite contains a name and a phone number.

The list is bound to a DataTemplate that describes the graphical aspects. In the this template is a button – Dial. When you click on that button I want the Dial() method of the Favorite to be called. Right now the Dial method of the page/window is called.

If this is not possible is there a way I can get the Favorite to somehow be attached to the Button? such that I know which Favorite was associated with the button press?

the below XAML does not work, Text=”{Binding Name}” works great as it binds to the Name property on the Favorite, but Click=”{Binding Dial}” does not call Dial() on the Favorite.

    <DataTemplate x:Key="DataTemplate1">
        <StackPanel d:DesignWidth="633" Orientation="Horizontal" Height="93">
            <Button x:Name="DialButton" Content="Edit" Click="{Binding Dial}"/>
            <TextBlock x:Name="TextBlock" TextWrapping="Wrap" Text="{Binding Name}" FontSize="64" Height="Auto" FontFamily="Segoe WP SemiLight"/>                                      
        </StackPanel>
    </DataTemplate>

Answer 1

So it should go:

<Button CommandParameter="{Binding}" Command="{Binding Dial}"/>

Then you will receive the data object as the command parameter. In this scenario you must provide a Property that is called Dial and returns an ICommand-implementation. If the property is not available on your data-object but on the main class (code-behind), you must look for it within the binding, use for this the RelativeSource keyword.

---

Another way is to make a click handler. In the click handler you can cast the sender to a Button (or FrameworkElement) and then get the data object from the DataContext. I assume you tried to create such a solution.

private void Button_Click(object sender, RoutedEventArgs e) {
    Button btn = (Button)sender;
    MyObject obj = btn.DataContext as MyObject; 
    if(null != obj){
         obj.Dial();
         // or Dial(obj);
    }
}

The markup must be as follows:

<Button x:Name="DialButton" Content="Edit" Click="Button_Click"/> 

The main difference is, that I removed the binding from the Click-Event and registered an event-handler.

---

A third solution would be, to register a handler in the code behind for the Button.ClickEvent. The principle is similiar as in the second example.

I don’t know silverlight very well. Perhaps there are the things a little bit other.