这是典型的App.xaml.cs代码
protected override void OnLaunched(LaunchActivatedEventArgs e)
{
#if DEBUG
if (System.Diagnostics.Debugger.IsAttached)
{
//this.DebugSettings.EnableFrameRateCounter = true;
}
#endif
rootFrame = Window.Current.Content as Frame;
// Do not repeat app initialization when the Window already has content,
// just ensure that the window is active
if (rootFrame == null)
{
// Create a Frame to act as the navigation context and navigate to the first page
rootFrame = new Frame();
rootFrame.NavigationFailed += OnNavigationFailed;
rootFrame.Navigated += OnNavigated;
if (e.PreviousExecutionState == ApplicationExecutionState.Terminated)
{
//TODO: Load state from previously suspended application
}
// Place the frame in the current Window
Window.Current.Content = rootFrame;
// Register a handler for BackRequested events and set the
// visibility of the Back button
SystemNavigationManager.GetForCurrentView().BackRequested += OnBackRequested;
SystemNavigationManager.GetForCurrentView().AppViewBackButtonVisibility =
rootFrame.CanGoBack ?
AppViewBackButtonVisibility.Visible :
AppViewBackButtonVisibility.Collapsed;
}
if (e.PrelaunchActivated == false)
{
if (rootFrame.Content == null)
{
// When the navigation stack isn't restored navigate to the first page,
// configuring the new page by passing required information as a navigation
// parameter
rootFrame.Navigate(typeof(SignInPage), e.Arguments);
}
// Ensure the current window is active
Window.Current.Activate();
}
}
调用rootFrame.Navigate(typeof(SignInPage), e.Arguments);
时,会创建SignInPage
。在SignInPage.xaml.cs
中,可能会有以下代码:this.Frame.Navigate(typeof(FramePage));
。来自Frame
的{{1}}与this.Frame.
相同吗?如果是,rootFrame
类的时间和地点从Page
分配了根框架?
答案 0 :(得分:2)
是的,这是Frame
个对象,因为Page
引用了控制其内容的框架。换句话说,导航到页面的Frame
。
<强>帧强>
获取页面内容的控制框架。
此属性会自动在导航中设置,并且首先在Page
方法的OnNavigatedTo
对象中提供。