161_navigationService = new NavigationService(this);

145if (f._navigationService.Content == value) 162_navigationService.BPReady += new BPReadyEventHandler(_OnBPReady); 203get { return _navigationService; } 259Invariant.Assert(frame._navigationService != null, "_navigationService should never be null here"); 262return frame._navigationService.Source; 285frame._navigationService.Navigate(uriToNavigate, null, false, true/* navigateOnSourceChanged */); 298SetCurrentValueInternal(SourceProperty, _navigationService.Source); 472_navigationService.InvalidateJournalNavigationScope(); 525return _navigationService; 681_navigationService.Refresh(); 739Invariant.Assert(_navigationService != null, "_navigationService should never be null here"); 740return ( !_navigationService.CanReloadFromUri && Content != null); 853_navigationService.AddBackEntry(state); 876return _navigationService.Navigate(source); 894return _navigationService.Navigate(source, extraData); 905return _navigationService.Navigate(content); 924return _navigationService.Navigate(content, extraData); 963_navigationService.StopLoading(); 972_navigationService.Refresh(); 985return _navigationService.CurrentSource; 1030_navigationService.Navigating += value; 1034_navigationService.Navigating -= value; 1048_navigationService.NavigationProgress += value; 1052_navigationService.NavigationProgress -= value; 1068_navigationService.NavigationFailed += value; 1072_navigationService.NavigationFailed -= value; 1091_navigationService.Navigated += value; 1095_navigationService.Navigated -= value; 1117_navigationService.LoadCompleted += value; 1121_navigationService.LoadCompleted -= value; 1135_navigationService.NavigationStopped += value; 1139_navigationService.NavigationStopped -= value; 1151_navigationService.FragmentNavigation += value; 1155_navigationService.FragmentNavigation -= value; 1235state.JournalEntry = _navigationService.MakeJournalEntry(JournalReason.NewContentNavigation); 1240state.NavSvcGuid = _navigationService.GuidId; 1258_navigationService.GuidId = state.NavSvcGuid; 1330NavigationService parentNS = _navigationService.ParentNavigationService; 1348parentJns.Journal.RemoveEntries(_navigationService.GuidId); 1352_navigationService.InvalidateJournalNavigationScope(); 1378_navigationService.InvalidateJournalNavigationScope();