how to reference drageventArgs in xaml as command parameter with silverlight

Question

Hi,

on my silverlight 4 app I am trying to link up the drop event on a list box to my viewmodel. I am using expression blend 4's event trigger and invokecommandaction to hook up the drop event. Setting break points on my viewmodel, I can see the relevant function is fired when I drag a file onto the list box, however I cant seem to get access to the drageventArgs. I tried sending the entire listbox as a command parameter, and that doesn't work.

Any ideas?

Thanks

Answer 1

I’m looking at exactly this issue at the moment. After a little research I found this http://www.silverlightshow.net/news/Silverlight-Commands-Hacks-Passing-EventArgs-as-CommandParameter-to-DelegateCommand-triggered-by-EventTrigger-.aspx

So in the meantime I’ve decided to use MVVM Light’s EventToCommand class which is similar to InvokeCommandAction but allows you to pass in the event args as the command parameter. (http://www.galasoft.ch/mvvm/getstarted/)

-- seems to work fine

<i:Interaction.Triggers>
        <i:EventTrigger EventName="Drop">
            <infra:EventToCommand  PassEventArgsToCommand="True"
                                           Command="{Binding Path=LinkOrderCommand}" />
        </i:EventTrigger>
    </i:Interaction.Triggers>