How can I handle delegates in my view model?

Question

I use the code below to handle row clicks in Telerik GridView, how can I handle the delegate for this method in my view model instead of handling OnRowMouseDown in my view?

EventManager.RegisterClassHandler(typeof(GridViewRow), GridViewRow.MouseLeftButtonDownEvent, new RoutedEventHandler(OnRowMouseDown), true);

The parameter new RoutedEventHandler(OnRowMouseDown) is a delegate .

Answer 1

You must handle the actual event using an event handler with a specific signature.

What you can do is to call a method of your view model from the event handler, ie in OnRowMouseDown :

var viewModel = DataContext as YourViewModel;
viewModel.SomeMethod();

The call to EventManager.RegisterClassHandler(typeof(GridViewRow), GridViewRow.MouseLeftButtonDownEvent, new RoutedEventHandler(OnRowMouseDown), true); in the view stays the same and so does the signature of OnRowMouseDown . You just move the logic from the event handler to the view model. This is what MVVM is all about basically.