在WPF应用程序中使用MVVM和DDD而不需要太多类

I have a WPF application where I want to apply MVVM for the presentation layer and DDD for the whole application. I am very confused with how I should apply the architecture. Can you give me some advises as it feels like I have completely messed up at the moment with the following design try:I have a WPF application where I want to apply