protected override void OnNavigatingFrom(NavigatingCancelEventArgs e)
 {
     base.OnNavigatingFrom(e);
     SystemNavigationManager.GetForCurrentView().AppViewBackButtonVisibility = AppViewBackButtonVisibility.Collapsed;
     SystemNavigationManager.GetForCurrentView().BackRequested -= this.Zoom_BackRequested;
     SemanticZoom.ViewChangeStarted -= SemanticZoom_ViewChangeStarted;
 }

 protected override void OnNavigatingFrom(NavigatingCancelEventArgs e)
 {
     ((BIRCViewModel)currentDataContext).GetSelectedConnection().OnAddHistory -= MainPage_OnAddHistory;
     ((BIRCViewModel)currentDataContext).OnBeforeServerSelectionChanged -= CurrentDataContext_OnBeforeServerSelectionChanged;
     ((BIRCViewModel)currentDataContext).OnAfterServerSelectionChanged -= CurrentDataContext_OnAfterServerSelectionChanged;
     Loaded -= MainPage_Loaded;
 }

 protected override void OnNavigatingFrom(NavigatingCancelEventArgs e)
 {
     if (ScenarioDisableButton.IsEnabled)
     {
         ScenarioDisable();
     }
 }

 // Cleanup scenario when it is about to be unloaded.
 protected override void OnNavigatingFrom(NavigatingCancelEventArgs e)
 {
     if (m_scenario1ViewModel != null)
     {
         m_scenario1ViewModel.ScenarioCleanup();
     }
 }

 public NavigatingCancelEventArgsWrapper([NotNull] NavigatingCancelEventArgs args, string parameter, bool bringToFront)
 {
     Should.NotBeNull(args, nameof(args));
     _args = args;
     _parameter = parameter;
     _bringToFront = bringToFront;
 }

        protected override async void OnNavigatingFrom(NavigatingCancelEventArgs e)
        {
            base.OnNavigatingFrom(e);
            Debug.WriteLine(e.SourcePageType);
            if (!isSave)//e.parameter 是否放弃
            {
                if (e.Parameter == null)
                {
                    e.Cancel = true;
                    MessageDialog dialog = new MessageDialog("你尚未保存更改，是否放弃");
                    dialog.Commands.Add(new UICommand("放弃") { Id = true });
                    dialog.Commands.Add(new UICommand("继续编辑") { Id = false });
                    var result = await dialog.ShowAsync();
                    if ((bool)result.Id)
                    {
                        e.Cancel = false;
                        Frame.Navigate(e.SourcePageType, true);
                    }
                    else
                    {
                        e.Cancel = true;

                    }
                }
            }
            else
            {

            }
        }

        private async void OnNavigating(object sender, NavigatingCancelEventArgs e)
        {
            await QmunicateLoggerHolder.Log(QmunicateLogLevel.Debug, "OnNavigating. SourcePageType=" + e.SourcePageType + " Mode=" + e.NavigationMode);
            var handler = Navigating;
            if (handler != null)
            {
                handler.Invoke(sender, e);
            }

            //if (!e.Cancel)
            //{
            //    switch (e.NavigationMode)
            //    {
            //        case NavigationMode.Back:
            //            NavigatedFrom(e);
            //            break;
            //        case NavigationMode.Forward:
            //            break;
            //        case NavigationMode.New:
            //            NavigatedFrom(e);
            //            break;
            //        case NavigationMode.Refresh:
            //            break;
            //    }
            //}
        }

 protected override void OnNavigatingFrom(NavigatingCancelEventArgs e)
 {
     // Before we navigate away from the page, we want to generate a new _persistedPosition string. This string contains the key of the item at the top of the 
     // viewing window (generated by the function GetKey) and the offset of that item.
     RestoreScrollPositionSample._persistedPosition = ListViewPersistenceHelper.GetRelativeScrollPosition(this.ItemsListView, this.GetKey);
     base.OnNavigatingFrom(e);
 }

        protected override void OnNavigatingFrom(NavigatingCancelEventArgs e)
        {
            CashFlowUserControl.Dispose();
            CategorySpreadingUserControl.Dispose();

            base.OnNavigatingFrom(e);
        }

 protected override void OnNavigatingFrom(NavigatingCancelEventArgs e)
 {
     base.OnNavigatingFrom(e);
     RossPathDisplay.CleanUp();
     //viewModel.CleanUpForPageChange();
     this.viewModel = null;
 }

 private void ComponentActivatorOnNavigating(object sender, NavigatingCancelEventArgs e)
 {
     if (e.NavigationMode == NavigationMode.New)
     {
         _storageCoordinator.Save(StorageMode.Temporary);
     }
 }

        protected override void OnNavigatingFrom(NavigatingCancelEventArgs e)
        {
            controller.RemoveListener(listener);
            controller.Dispose();

            base.OnNavigatingFrom(e);
        }

 public NavigatingEventArgs(DeferralManager manager, NavigatingCancelEventArgs e, Page page, object parameter) : this(manager)
 {
     NavigationMode = e.NavigationMode;
     PageType = e.SourcePageType;
     Page = page;
     Parameter = parameter;
 }

 protected override void OnNavigatingFrom(NavigatingCancelEventArgs e)
 {
     base.OnNavigatingFrom(e);
     var viewModel = DataContext as INavigationAware;
     if (viewModel != null)
         viewModel.OnNavigatingFrom(new NavigatingCancelContext(true, (NavigationMode)e.NavigationMode, () => e.Cancel, (cancel) => e.Cancel = cancel));
 }

 public NavigatingArgs(NavigatingCancelEventArgs e)
 {
     NavigationMode = e.NavigationMode.ToNavigationModes();
     NavigationTransitionInfo = e.NavigationTransitionInfo;
     Parameter = e.Parameter;
     SourcePageType = e.SourcePageType;
 }

 protected override void OnNavigatingFrom(NavigatingCancelEventArgs e)
 {
     if (Animating)
     {
         CompositionTarget.Rendering -= AdvanceAnimation;
     }
 }

 public NavigatingEventArgs(NavigatingCancelEventArgs e, Page page)
 {
     this.Page = page;
     this.NavigationMode = e.NavigationMode;
     this.PageType = e.SourcePageType;
     this.Parameter = e.Parameter?.ToString();
 }

        protected override void OnNavigatingFrom(NavigatingCancelEventArgs e)
        {
            SpreadingPlotView.Model = null;
            SpreadingPlotView = null;

            base.OnNavigatingFrom(e);
        }

        protected override void OnNavigatingFrom(NavigatingCancelEventArgs e)
        {
            // Remove the back button handle
            (App.Current as App).BackRequested -= App_BackRequested;

            base.OnNavigatingFrom(e);
        }

 protected override void OnNavigatingFrom(NavigatingCancelEventArgs e)
 {
     if (!(e.Parameter is bool))
         return;
     bool navigatingRight = (bool)e.Parameter;
     EntranceAnimation.FromHorizontalOffset = navigatingRight ? -300 : 300;
 }