App.xaml.cs

using Microsoft.WindowsAzure.Storage.Auth;
using Microsoft.WindowsAzure.Storage.Blob;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Runtime.InteropServices.WindowsRuntime;
using Windows.ApplicationModel;
using Windows.ApplicationModel.Activation;
using Windows.Data.Xml.Dom;
using Windows.Foundation;
using Windows.Foundation.Collections;
using Windows.Storage;
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;

namespace open360cam
{
    /// <summary>
    /// Provides application-specific behavior to supplement the default Application class.
    /// </summary>
    sealed partial class App : Application
    {
        private const string ConfigFileName
#if DEBUG
        = "app.config.xml";
#else //TODO: change to prod config
        = "app.config.xml";
#endif // DEBUG

        private static StorageCredentials cred;
        public static CloudBlobContainer container;
        /// <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 such as when the application is launched to open a specific file.
        /// </summary>
        /// <param name="e">Details about the launch request and process.</param>
        protected override async void OnLaunched(LaunchActivatedEventArgs e)
        {

#if DEBUG
            if (System.Diagnostics.Debugger.IsAttached)
            {
                this.DebugSettings.EnableFrameRateCounter = true;
            }
#endif

            Frame 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;

                if (e.PreviousExecutionState == ApplicationExecutionState.Terminated)
                {
                    //TODO: Load state from previously suspended application
                }

                // Place the frame in the current Window
                Window.Current.Content = rootFrame;
            }

            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(MainPage), e.Arguments);
            }

            StorageFile file = await StorageFile.GetFileFromApplicationUriAsync(
                new Uri(String.Format("ms-appx:///Assets/Configuration/{0}", ConfigFileName)));

            XmlDocument xmlConfiguration = await XmlDocument.LoadFromFileAsync(file);
            IXmlNode nameNode = xmlConfiguration.DocumentElement.SelectSingleNode("./appSettings/add[@key='storage-name']/@value");

            if (nameNode == null)
            {
                // do some error handling or set default value
                return;
            }

            string configNameValue = (string) nameNode.NodeValue;

            IXmlNode keyNode = xmlConfiguration.DocumentElement.SelectSingleNode("./appSettings/add[@key='storage-key']/@value");

            if (keyNode == null)
            {
                // do some error handling or set default value
                return;
            }

            string configKeyValue = (string) keyNode.NodeValue;

            IXmlNode urlNode = xmlConfiguration.DocumentElement.SelectSingleNode("./appSettings/add[@key='storage-url']/@value");

            if (urlNode == null)
            {
                // do some error handling or set default value
                return;
            }

            string configUrlValue = (string) urlNode.NodeValue;

            cred = new StorageCredentials(configNameValue, configKeyValue);
            container = new CloudBlobContainer(new Uri(configUrlValue), cred);

            // Ensure the current window is active
            Window.Current.Activate();
        }

        /// <summary>
        /// Invoked when Navigation to a certain page fails
        /// </summary>
        /// <param name="sender">The Frame which failed navigation</param>
        /// <param name="e">Details about the navigation failure</param>
        void OnNavigationFailed(object sender, NavigationFailedEventArgs e)
        {
            throw new Exception("Failed to load Page " + e.SourcePageType.FullName);
        }

        /// <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();
        }
    }
}