在OnNavigatingFrom上取消导航时停止wp7 out转换

Question

在某些情况下，在我应用程序中，我必须取消后退导航。我是用代码来做的：

    protected override void OnNavigatingFrom(NavigatingCancelEventArgs e)
    {
        if (e.NavigationMode == NavigationMode.Back)
        {
            if (WaitPanelGrid.Visibility == System.Windows.Visibility.Visible)
            {
                e.Cancel = true;
            }
        }
        base.OnNavigatingFrom(e);
    }

一切都很好，只有一件事例外:在这个页面中，我有一些过渡：

<toolkit:TransitionService.NavigationInTransition>
    <toolkit:NavigationInTransition>
        <toolkit:NavigationInTransition.Backward>
            <toolkit:TurnstileTransition Mode="BackwardIn" />
        </toolkit:NavigationInTransition.Backward>
        <toolkit:NavigationInTransition.Forward>
            <toolkit:TurnstileTransition Mode="ForwardIn" />
        </toolkit:NavigationInTransition.Forward>
    </toolkit:NavigationInTransition>
</toolkit:TransitionService.NavigationInTransition>
<toolkit:TransitionService.NavigationOutTransition>
    <toolkit:NavigationOutTransition>
        <toolkit:NavigationOutTransition.Backward>
            <toolkit:TurnstileTransition Mode="BackwardOut" />
        </toolkit:NavigationOutTransition.Backward>
        <toolkit:NavigationOutTransition.Forward>
            <toolkit:TurnstileTransition Mode="ForwardOut" />
        </toolkit:NavigationOutTransition.Forward>
    </toolkit:NavigationOutTransition>
</toolkit:TransitionService.NavigationOutTransition>

并在OnNavigatingFrom停止应用程序中调用Cancel从导航返回，但过渡仍在工作，所以在最后我只是黑屏，因为页面没有改变，但它是动画和移动到屏幕后面的某个地方。

我的问题是:如何取消导航和过渡？

Answer 1

摘自this article

禁用导航过渡

如果要禁用页面的导航过渡，请在页面上将TransitionService.NavigationInTransition和TransitionService.NavigationOutTransition设置为null。如果您想恢复这些值，只需预先存储它们，然后重新设置它们。

PhoneApplicationFrame frame = (PhoneApplicationFrame)Application.Current.RootVisual;

PhoneApplicationPage page = (PhoneApplicationPage)frame.Content;

// Save the transitions

NavigationInTransition oldIn = TransitionService.GetNavigationInTransition(page);

NavigationOutTransition oldOut = TransitionService.GetNavigationOutTransition(page);

// Clear the transitions

TransitionService.SetNavigationInTransition(page, null);

TransitionService.SetNavigationOutTransition(page, null);

// Restore the transitions

TransitionService.SetNavigationInTransition(page, oldIn);

TransitionService.SetNavigationOutTransition(page, oldOut);