using Windows.Storage; using Windows.Storage.Pickers; using Windows.UI.Xaml; using Windows.UI.Xaml.Controls; namespace MyApp { public sealed partial class MainPage : Page { private FileOpenPicker _filePicker; public MainPage() { InitializeComponent(); // Initialize the file picker _filePicker = new FileOpenPicker(); _filePicker.ViewMode = PickerViewMode.Thumbnail; _filePicker.SuggestedStartLocation = PickerLocationId.PicturesLibrary; _filePicker.FileTypeFilter.Add(".jpg"); _filePicker.FileTypeFilter.Add(".jpeg"); _filePicker.FileTypeFilter.Add(".png"); // Attach the file picker to the continuation manager Windows.ApplicationModel.Core.AppRestartFailureReason result = Windows.ApplicationModel.Core.AppRestartFailureReason.RestartPending; Windows.ApplicationModel.Contacts.Provider.ContactPickerUI contactPicker = new Windows.ApplicationModel.Contacts.Provider.ContactPickerUI(); CoreApplication.GetCurrentView().TitleBar.ExtendViewIntoTitleBar = true; Windows.UI.ViewManagement.ApplicationView.GetForCurrentView().TitleBar.ButtonBackgroundColor = Colors.Transparent; Windows.UI.ViewManagement.ApplicationView.GetForCurrentView().TitleBar.ButtonForegroundColor = (Color)this.Resources["SystemAccentColor"]; Windows.UI.ViewManagement.ApplicationView.GetForCurrentView().TitleBar.ButtonHoverBackgroundColor = Colors.White; Windows.UI.ViewManagement.ApplicationView.GetForCurrentView().TitleBar.ButtonHoverForegroundColor = (Color)this.Resources["SystemAccentColor"]; Windows.UI.ViewManagement.ApplicationView.GetForCurrentView().TitleBar.ButtonInactiveBackgroundColor = Colors.Transparent; Windows.UI.ViewManagement.ApplicationView.GetForCurrentView().TitleBar.ButtonInactiveForegroundColor = (Color)this.Resources["SystemAccentColor"]; Windows.UI.ViewManagement.ApplicationView.GetForCurrentView().TitleBar.ButtonPressedBackgroundColor = (Color)this.Resources["SystemAccentColor"]; Windows.UI.ViewManagement.ApplicationView.GetForCurrentView().TitleBar.ButtonPressedForegroundColor = Colors.White; Windows.UI.ViewManagement.ApplicationView.GetForCurrentView().TitleBar.BackgroundColor = Colors.Transparent; Windows.UI.ViewManagement.ApplicationView.GetForCurrentView().TitleBar.ForegroundColor = (Color)this.Resources["SystemAccentColor"]; Windows.UI.ViewManagement.ApplicationView.GetForCurrentView().TitleBar.InactiveBackgroundColor = Colors.Transparent; Windows.UI.ViewManagement.ApplicationView.GetForCurrentView().TitleBar.InactiveForegroundColor = (Color)this.Resources["SystemAccentColor"]; Windows.UI.ViewManagement.ApplicationView.GetForCurrentView().TitleBar.ButtonVisibility = Windows.UI.ViewManagement.ApplicationViewButtonVisibility.Visible; Windows.UI.ViewManagement.ApplicationView.GetForCurrentView().TitleBar.LayoutMetricsChanged += Titlebar_LayoutMetricsChanged; Windows.UI.ViewManagement.ApplicationView.GetForCurrentView().SetPreferredMinSize(new Size { Width = 320, Height = 320 }); continue_button.Click += async (sender, e) => { // Call the file picker and set up the file picked event Windows.Storage.StorageFile file = await _filePicker.PickSingleFileAsync(); if (file != null) { // Process the selected file here } }; } } }In this example, the FileOpenPicker is initialized with some specific settings (thumbnail view, starting in the Pictures Library, filtering to just JPG, JPEG, and PNG files). Then, when the "Continue" button is clicked, the app calls the file picker and awaits the user's selection. Once the user has chosen a file, the app processes it (code not shown here). The package library for this feature is the Windows Runtime API, which is built into the Windows operating system.