scenario4_childmanagement.xaml.cs

using Microsoft.UI.Xaml;
using Microsoft.UI.Xaml.Controls;
using Microsoft.UI.Xaml.Navigation;
using Microsoft.Windows.ApplicationModel.WindowsAppRuntime;
using System;
using System.Collections.Generic;

// To learn more about WinUI, the WinUI project structure,
// and more about our project templates, see: http://aka.ms/winui-project-info.

using Windows.ApplicationModel;
using Windows.ApplicationModel.Core;
using Windows.Foundation;
using Windows.Management.Deployment;

namespace PackageSampleHostedApp
{
    /// <summary>
    /// An empty page that can be used on its own or navigated to within a Frame.
    /// </summary>
    public sealed partial class Scenario4 : Page
    {
        // A pointer back to the main page.  This is needed if you want to call methods in MainPage such
        // as NotifyUser()
        MainPage rootPage = MainPage.Current;
        PackageCatalog catalog = null;

        public Scenario4()
        {
            this.InitializeComponent();
        }

        //[Windows.Foundation.Metadata.Overload("AddPackageByUriAsync")]
        //[Windows.Foundation.Metadata.RemoteAsync]
        //public IAsyncOperationWithProgress<Microsoft.Windows.ApplicationModel.WindowsAppRuntime.DeploymentResult, DeploymentProgress> AddPackageByUriAsync(System.Uri packageUri, AddPackageOptions options);


        /// <summary>
        /// Invoked when this page is about to be displayed in a Frame.
        /// </summary>
        /// <param name="e">Event data that describes how this page was reached.  The Parameter
        /// property is typically used to configure the page.</param>
        protected override void OnNavigatedTo(NavigationEventArgs e)
        {
        }
       
        private void GetHostInfo_Click(object sender, RoutedEventArgs e)
        {
            var pkgdependents = PackageRelationship.Dependents;
           
            
            var hostRuntimeDependents = new FindRelatedPackagesOptions(pkgdependents)
            {
                IncludeFrameworks = false,
                IncludeHostRuntimes = true,
                IncludeOptionals = false,
                IncludeResources = false
            };
            //var hostRuntimeDependents = new FindRelatedPackagesOptions(PackageRelationship.Dependents)


            IList<Windows.ApplicationModel.Package> dependents = Package.Current.FindRelatedPackages(hostRuntimeDependents);

            String output = String.Format("Count: {0}", dependents.Count.ToString());
            for (int i = 0; i < dependents.Count; i++)
            {
                Package dependent = dependents[i];
                output += String.Format("\n[{0}]: {1}", i.ToString(), dependent.Id.FullName);
            }

            OutputTextBlock.Text = output;


        }
        private void PackageInstallingCallback(object x, PackageInstallingEventArgs args)
        {
            Package package = args.Package;
            OutputTextBlock.Text = package.DisplayName;
        }

        private void PackageUninstallingCallback(object x, PackageUninstallingEventArgs args) 

        {
            

            if (this.DispatcherQueue.HasThreadAccess)
            {
                OutputTextBlock.Text = OutputTextBlock.Text;
            }

            else
            {
                bool isQueued = this.DispatcherQueue.TryEnqueue(
                Microsoft.UI.Dispatching.DispatcherQueuePriority.Normal,
                () => OutputTextBlock.Text = OutputTextBlock.Text + "\n  PackageUninstalling " + args.Package.Id.FullName + " Progress " + args.Progress + " IsComplete " + args.IsComplete + " ActivityId " + args.ActivityId);

            }
        }

        //{
        //    var ignored = CoreApplication.MainView.CoreWindow.DispatcherQueue.TryEnqueue(Microsoft.UI.Dispatching.DispatcherQueuePriority.Normal, () =>
        //    {
        //        OutputTextBlock.Text = OutputTextBlock.Text + "\n  PackageUninstalling " + args.Package.Id.FullName + " Progress " + args.Progress + " IsComplete " + args.IsComplete + " ActivityId " + args.ActivityId + " ErrorCode " + args.ErrorCode.ToString();
        //    });
        //}
        private void OptionalPackageUpdatingCallback(object x, PackageUpdatingEventArgs args)
        {
            Package package = args.TargetPackage;
            OutputTextBlock.Text = package.DisplayName;
        }

        private void Register_for_notifications_Click(object sender, RoutedEventArgs e)
        {
            catalog = PackageCatalog.OpenForPackage(Package.Current);
            OutputTextBlock.Text = "PackageCatalog Opened";
            catalog.PackageUpdating += OptionalPackageUpdatingCallback;
            catalog.PackageInstalling += PackageInstallingCallback;
            catalog.PackageUninstalling += PackageUninstallingCallback;
        }
    }
}