148_navigationService = new NavigationService(this);

132if (f._navigationService.Content == value) 149_navigationService.BPReady += new BPReadyEventHandler(_OnBPReady); 190get { return _navigationService; } 245Invariant.Assert(frame._navigationService != null, "_navigationService should never be null here"); 248return frame._navigationService.Source; 271frame._navigationService.Navigate(uriToNavigate, null, false, true/* navigateOnSourceChanged */); 284SetCurrentValueInternal(SourceProperty, _navigationService.Source); 458_navigationService.InvalidateJournalNavigationScope(); 511return _navigationService; 664_navigationService.Refresh(); 722Invariant.Assert(_navigationService != null, "_navigationService should never be null here"); 723return ( !_navigationService.CanReloadFromUri && Content != null); 836_navigationService.AddBackEntry(state); 859return _navigationService.Navigate(source); 877return _navigationService.Navigate(source, extraData); 888return _navigationService.Navigate(content); 907return _navigationService.Navigate(content, extraData); 946_navigationService.StopLoading(); 955_navigationService.Refresh(); 968return _navigationService.CurrentSource; 1013_navigationService.Navigating += value; 1017_navigationService.Navigating -= value; 1031_navigationService.NavigationProgress += value; 1035_navigationService.NavigationProgress -= value; 1051_navigationService.NavigationFailed += value; 1055_navigationService.NavigationFailed -= value; 1074_navigationService.Navigated += value; 1078_navigationService.Navigated -= value; 1100_navigationService.LoadCompleted += value; 1104_navigationService.LoadCompleted -= value; 1118_navigationService.NavigationStopped += value; 1122_navigationService.NavigationStopped -= value; 1134_navigationService.FragmentNavigation += value; 1138_navigationService.FragmentNavigation -= value; 1215JournalEntry = _navigationService.MakeJournalEntry(JournalReason.NewContentNavigation), 1220NavSvcGuid = _navigationService.GuidId, 1239_navigationService.GuidId = state.NavSvcGuid; 1305NavigationService parentNS = _navigationService.ParentNavigationService; 1321parentJns?.Journal.RemoveEntries(_navigationService.GuidId); 1324_navigationService.InvalidateJournalNavigationScope(); 1350_navigationService.InvalidateJournalNavigationScope();