Here is a sample project that you download: https://github.com/keithgemeinhart/ArcGis.Wpf.DragDropDemoA couple of key points .... I use the GalaSoft MVVM Light library to get an implementation of EventToCommand. The provides a mechanism for mapping an event to a command in the view model. For example:<i:Interaction.Triggers > <i:EventTrigger EventName="Loaded"> <cmd:EventToCommand Command="{Binding MapLoadedCommand, Source={StaticResource DragDropViewModel}}" PassEventArgsToCommand="True"/> </i:EventTrigger> </i:Interaction.Triggers>
This maps the Loaded event on the map to the MapLoadedCommand in the DragDropViewModel. That's a key event because we need a means for getting a map reference into the view model. So my solution was to capture the map reference as a parameter of the map's Loaded event. Here is the implementation in the view model. The last line in the method extracts the map reference from the RoutedEventArgs Source property.private void MapLoaded(object parameter) { // See if the event sent the map in the event args var p1 = parameter as System.Windows.RoutedEventArgs; if (p1 == null) { throw new NullReferenceException("Cannot capture map reference."); return; } _map = p1.Source as Map; }
If you have any questions, just let me know.
