149_navigationService = new NavigationService(this);

133if (f._navigationService.Content == value) 150_navigationService.BPReady += new BPReadyEventHandler(_OnBPReady); 191get { return _navigationService; } 246Invariant.Assert(frame._navigationService != null, "_navigationService should never be null here"); 249return frame._navigationService.Source; 272frame._navigationService.Navigate(uriToNavigate, null, false, true/* navigateOnSourceChanged */); 285SetCurrentValueInternal(SourceProperty, _navigationService.Source); 459_navigationService.InvalidateJournalNavigationScope(); 512return _navigationService; 665_navigationService.Refresh(); 723Invariant.Assert(_navigationService != null, "_navigationService should never be null here"); 724return ( !_navigationService.CanReloadFromUri && Content != null); 837_navigationService.AddBackEntry(state); 860return _navigationService.Navigate(source); 878return _navigationService.Navigate(source, extraData); 889return _navigationService.Navigate(content); 908return _navigationService.Navigate(content, extraData); 947_navigationService.StopLoading(); 956_navigationService.Refresh(); 969return _navigationService.CurrentSource; 1014_navigationService.Navigating += value; 1018_navigationService.Navigating -= value; 1032_navigationService.NavigationProgress += value; 1036_navigationService.NavigationProgress -= value; 1052_navigationService.NavigationFailed += value; 1056_navigationService.NavigationFailed -= value; 1075_navigationService.Navigated += value; 1079_navigationService.Navigated -= value; 1101_navigationService.LoadCompleted += value; 1105_navigationService.LoadCompleted -= value; 1119_navigationService.NavigationStopped += value; 1123_navigationService.NavigationStopped -= value; 1135_navigationService.FragmentNavigation += value; 1139_navigationService.FragmentNavigation -= value; 1216JournalEntry = _navigationService.MakeJournalEntry(JournalReason.NewContentNavigation), 1221NavSvcGuid = _navigationService.GuidId, 1240_navigationService.GuidId = state.NavSvcGuid; 1306NavigationService parentNS = _navigationService.ParentNavigationService; 1322parentJns?.Journal.RemoveEntries(_navigationService.GuidId); 1325_navigationService.InvalidateJournalNavigationScope(); 1351_navigationService.InvalidateJournalNavigationScope();