如何在Windows 8的启动画面中添加进度环？
我需要激活启动画面，并使用C＃和XAML在Windows 8 metro应用程序中添加进度环。 我添加了扩展的启动画面，但它根本没有显示！ 谁能告诉我怎么做？
using System; using System.Collections.Generic; using System.IO; using System.Linq; using Windows.ApplicationModel; using Windows.ApplicationModel.Activation; using Windows.Foundation; using Windows.Foundation.Collections; using Windows.UI.Xaml; using Windows.UI.Xaml.Controls; using Windows.UI.Xaml.Controls.Primitives; using Windows.UI.Xaml.Data; using Windows.UI.Xaml.Input; using Windows.UI.Xaml.Media; using Windows.UI.Xaml.Navigation; using SplashScreenSample; // The Blank Application template is documented at http://go.microsoft.com/fwlink/? LinkId=234227 namespace App1 { /// /// Provides application-specific behavior to supplement the default Application class. /// sealed partial class App : Application { /// /// Initializes the singleton application object. This is the first line of authored code /// executed, and as such is the logical equivalent of main() or WinMain(). /// public App() { this.InitializeComponent(); this.Suspending += OnSuspending; } /// /// Invoked when the application is launched normally by the end user. Other entry points /// will be used when the application is launched to open a specific file, to display /// search results, and so forth. /// /// Details about the launch request and process. protected override void OnLaunched(LaunchActivatedEventArgs args) { // Do not repeat app initialization when already running, just ensure that // the window is active /* if (args.PreviousExecutionState != ApplicationExecutionState.Running) { bool loadState = (args.PreviousExecutionState == ApplicationExecutionState.Terminated); ExtendedSplash extendedSplash = new ExtendedSplash(args.SplashScreen, loadState); Window.Current.Content = extendedSplash; } Window.Current.Activate();*/ if (args.PreviousExecutionState == ApplicationExecutionState.Running) { Window.Current.Activate(); return; } if (args.PreviousExecutionState == ApplicationExecutionState.Terminated) { //TODO: Load state from previously suspended application } // Create a Frame to act navigation context and navigate to the first page var rootFrame = new Frame(); rootFrame.Navigate(typeof(MainPage)); // Place the frame in the current window and ensure that it is active Window.Current.Content = rootFrame; Window.Current.Activate(); if (!rootFrame.Navigate(typeof(MainPage))) { throw new Exception("Failed to create initial page"); } // Place the frame in the current Window and ensure that it is active Window.Current.Content = rootFrame; Window.Current.Activate(); } /// /// Invoked when application execution is being suspended. Application state is saved /// without knowing whether the application will be terminated or resumed with the contents /// of memory still intact. /// /// The source of the suspend request. /// Details about the suspend request. private void OnSuspending(object sender, SuspendingEventArgs e) { var deferral = e.SuspendingOperation.GetDeferral(); //TODO: Save application state and stop any background activity deferral.Complete(); } /// /// Invoked when the application is activated to display search results. /// /// Details about the activation request. protected override void OnSearchActivated(Windows.ApplicationModel.Activation.SearchActivatedEventArgs args) { App1.SearchResultsPage1.Activate(args.QueryText, args.PreviousExecutionState); } } } 通过使用扩展开始屏幕，您处于正确的轨道上。
您应该从示例和快速入门开始，运行它，看看它是否适合您http://msdn.microsoft.com/en-us/library/windows/apps/xaml/Hh973049%28v=win.10%29。 aspx http://code.msdn.microsoft.com/windowsapps/Splash-screen-sample-89c1dc78
如果样本正在运行且代码不正常，请尝试查找两者之间的不同内容，或者将代码迁移到样本中。 在XAML方面也可能是不合适的。
此链接非常有用，并解释了如何在Windows 8中向启动画面添加进度环？ http://msdn.microsoft.com/en-us/library/windows/apps/xaml/hh868191.aspx#modify_the_launch_activation_handler