codesai_carlos_windows_apps_best_2.cs

public static void Navigate<T>(Window w, object context){
 ((Frame) w.Context).Navigate(typeof(T), 
   new NavigationParameters{
       ViewModel = GetViewModel<T>(),
       Context = context ?? GetContext<T>()
 });
}

private static object GetViewModel<T>(){
    if (typeof (T) == typeof(Vehicle)){
        return Factory.CreateVehicleViewModel();
    }
    ...
    throw new NotImplementedException("Can't navigate to such page");
}