149_navigationService = new NavigationService(this);

133if (f._navigationService.Content == value) 150_navigationService.BPReady += new BPReadyEventHandler(_OnBPReady); 191get { return _navigationService; } 247Invariant.Assert(frame._navigationService != null, "_navigationService should never be null here"); 250return frame._navigationService.Source; 273frame._navigationService.Navigate(uriToNavigate, null, false, true/* navigateOnSourceChanged */); 286SetCurrentValueInternal(SourceProperty, _navigationService.Source); 460_navigationService.InvalidateJournalNavigationScope(); 513return _navigationService; 669_navigationService.Refresh(); 727Invariant.Assert(_navigationService != null, "_navigationService should never be null here"); 728return ( !_navigationService.CanReloadFromUri && Content != null); 841_navigationService.AddBackEntry(state); 864return _navigationService.Navigate(source); 882return _navigationService.Navigate(source, extraData); 893return _navigationService.Navigate(content); 912return _navigationService.Navigate(content, extraData); 951_navigationService.StopLoading(); 960_navigationService.Refresh(); 973return _navigationService.CurrentSource; 1018_navigationService.Navigating += value; 1022_navigationService.Navigating -= value; 1036_navigationService.NavigationProgress += value; 1040_navigationService.NavigationProgress -= value; 1056_navigationService.NavigationFailed += value; 1060_navigationService.NavigationFailed -= value; 1079_navigationService.Navigated += value; 1083_navigationService.Navigated -= value; 1105_navigationService.LoadCompleted += value; 1109_navigationService.LoadCompleted -= value; 1123_navigationService.NavigationStopped += value; 1127_navigationService.NavigationStopped -= value; 1139_navigationService.FragmentNavigation += value; 1143_navigationService.FragmentNavigation -= value; 1223state.JournalEntry = _navigationService.MakeJournalEntry(JournalReason.NewContentNavigation); 1228state.NavSvcGuid = _navigationService.GuidId; 1246_navigationService.GuidId = state.NavSvcGuid; 1318NavigationService parentNS = _navigationService.ParentNavigationService; 1336parentJns.Journal.RemoveEntries(_navigationService.GuidId); 1340_navigationService.InvalidateJournalNavigationScope(); 1366_navigationService.InvalidateJournalNavigationScope();