WPF MVVM：命令很简单。如何使用RoutedEvent连接View和ViewModel

Suppose I have a view implemented as a DataTempate inside a resource Dictionary. And I have a corresponding ViewModel. Binding Commands are easy. But what if my View contains a control such as a ListBox, and I need to Publish an application wide event (Using Prism's Event Aggreagtor) based on the Item being Changed on the List.Suppose I have a view implemented as a DataTemp