创建框架

像任何其他控件一样创建框架：

<Frame x:Name="contentRoot"
       Navigated="OnNavigated"
       Navigating="OnNavigating" />

然后可以拦截导航/导航事件以取消导航或显示/隐藏后退按钮。

private void OnNavigating(object sender, NavigatingCancelEventArgs e)
{
    if(contentRoot.SourcePageType  == e.SourcePageType && m_currentPageParameter == e.Parameter)
   {
       // we are navigating again to the current page, we cancel the navigation
       e.Cancel    = true;
   }
}

private void OnNavigated(object sender, NavigationEventArgs e)
{
    // user has navigated to a newest page, we check if we can go back and show the back button if needed.
    // we can also alter the backstack navigation history if needed
    SystemNavigationManager.GetForCurrentView().AppViewBackButtonVisibility = (contentRoot.CanGoBack ? AppViewBackButtonVisibility.Visible : AppViewBackButtonVisibility.Collapsed);  
}