Implementing the MVVM Pattern
There are two general approaches to MVVM viewmodel and view creation: view-first and viewmodel-first. The first approach sees the creation of the view before the viewmodel. Conversely, in the viewmodel-first approach, it is the viewmodel that creates the view. Both approaches have their pros and cons. Viewmodel-first potentially offers complete independence from the UI, allowing an app to be executed entirely without a UI; yet it suffers from various implementation challenges. View-first is far simpler to implement when page navigation is used, as is the case in a Silverlight for Windows Phone app.
This book uses the view-first approach exclusively.
MVVM in a XAML app relies on the assignment of a viewmodel to the ...
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