Prism & Silverlight: Part 10 - A Larger Example - "Email Client"

Hi Mike,

At around 30 minues you go and create your own commands for ListBoxSelectionChanged and TreeViewSelectionChanged - what are your opinions on using, for example, a TwoWay Binding to the ListBox SelectedItem property to the view model instead and then publish the event in the Setter?  Not such a nice solution perhaps but possibly easier in many of these cases.  Here's what I did for the MailListViewModel which seems to work fine:

Adding a binding as follows:

<ListBox SelectedItem="{Binding SelectedItem, Mode=TwoWay}"

 ScrollViewer.HorizontalScrollBarVisibility="Hidden" 

ItemsSource="{Binding Emails}">

Then had the following property on the view model:

private object _selectedItem=null; 

public object SelectedItem { 

   get { return _selectedItem; } 

   set { 

        _selectedItem = value; 

        EmailSelectionChangedEvent evt = eventAggregator.GetEvent<EmailSelectionChangedEvent>(); 

        MailViewModel viewModel = (MailViewModel)value; 

        evt.Publish(viewModel == null ? null : viewModel.Email); 

       } 

}

Can you see any problems with this approach?

One other thought - you use converters in some of the views - I know that some MVVM guys think that you should never need a converter in the View since the ViewModel should prepare the data correctly for it.  I also know there are lots of discussions about MVVM currently and nothing really baked into the framework or tools to answer all the current questions - but just wondered what your opinion was.

Fantastic set of videos by the way - really detailed and incredibly useful - many thanks for the work you have put into them; I for one really appreciate the hands-on "live code" approach that you take...

Cheers

Ian