如何在Windows 8的初始屏幕中添加进度环？

Question

我需要激活初始屏幕，并在Windows 8 Metro应用程序中使用C＃和XAML向其添加进度环。 我已经添加了扩展的初始屏幕，但是根本没有显示！ 有人可以告诉我该怎么做吗？

    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
    {
    /// <summary>
    /// Provides application-specific behavior to supplement the default Application class.
    /// </summary>
    sealed partial class App : Application
    {
        /// <summary>
        /// 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().
        /// </summary>
        public App()
        {
            this.InitializeComponent();
            this.Suspending += OnSuspending;
        }

        /// <summary>
        /// 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.
        /// </summary>
        /// <param name="args">Details about the launch request and process.</param>
        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();
        }

        /// <summary>
        /// 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.
        /// </summary>
        /// <param name="sender">The source of the suspend request.</param>
        /// <param name="e">Details about the suspend request.</param>
        private void OnSuspending(object sender, SuspendingEventArgs e)
        {
            var deferral = e.SuspendingOperation.GetDeferral();
            //TODO: Save application state and stop any background activity
            deferral.Complete();
        }

        /// <summary>
        /// Invoked when the application is activated to display search results.
        /// </summary>
        /// <param name="args">Details about the activation request.</param>
        protected override void OnSearchActivated(Windows.ApplicationModel.Activation.SearchActivatedEventArgs args)
        {
            App1.SearchResultsPage1.Activate(args.QueryText, args.PreviousExecutionState);
        }
    }
}

Answer 1

使用扩展的开始屏幕，您在正确的轨道上。

您应该从示例和快速入门开始，运行该示例，并查看它是否对您有用http://msdn.microsoft.com/zh-cn/library/windows/apps/xaml/Hh973049%28v=win.10%29。 aspx http://code.msdn.microsoft.com/windowsapps/Splash-screen-sample-89c1dc78

如果该示例正常工作，而您的代码无效，请尝试查找两者之间的不同之处，或者将代码迁移到该示例中。 在XAML方面也可能是不合适的。

Answer 2

此链接非常有帮助，并说明了如何在Windows 8的初始屏幕中添加进度环？ http://msdn.microsoft.com/zh-CN/library/windows/apps/xaml/hh868191.aspx#modify_the_launch_activation_handler