Abstracting the Navigation Service
This section begins with a brief note about its inclusion. I did not intend to show the abstraction of the navigation service. When I began work on the sample for this chapter, however, and I reached the point of needing to navigate from the sign-in page to the timeline page, I felt that it would make for a nice demonstration of a custom testable navigation service.
The custom navigation service abstracts the navigation mechanism provided by the System.Windows.Controls.Frame component or the System.Windows.Navigation.NavigationService (available via the NavigationService property of the Page class).
A custom INavigationService interface is used to navigate in a UI technology agnostic manner, and it allows the ...
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