What the best way to use command binding under Microsoft.Toolkit.MVVM
Solution 1:
the simple answer is the type of the object in button Command is ICommand and in the ListView the SelectionChanged is an event and not ICommand , this why you need to use eventTrigger which is an "addon"
if you look at it from MVVM perspective the button is here to bind a command the ListView has SelectedItems collection that you can bind to and not the event , but that's more of a choice you need to make (I think that your code looks fine once you are used to it)