windows phone 选择照片

App.cs

using System;

using System.Collections.Generic;

using System.Linq;

using System.Net;

using System.Windows;

using System.Windows.Controls;

using System.Windows.Documents;

using System.Windows.Input;

using System.Windows.Media;

using System.Windows.Media.Animation;

using System.Windows.Media.Imaging;

using System.Windows.Navigation;

using System.Windows.Shapes;

using Microsoft.Phone.Controls;

using Microsoft.Phone.Shell;



namespace PhotoApp

{

    public class GlobalData

    {

        public BitmapImage bitmapImage;

    }



    public partial class App : Application

    {

        public static GlobalData globalData;



        /// <summary>

        /// Provides easy access to the root frame of the Phone Application.

        /// </summary>

        /// <returns>The root frame of the Phone Application.</returns>

        public PhoneApplicationFrame RootFrame { get; private set; }



        /// <summary>

        /// Constructor for the Application object.

        /// </summary>

        public App()

        {

            globalData = new GlobalData();

            globalData.bitmapImage = new BitmapImage();



            // Global handler for uncaught exceptions. 

            UnhandledException += Application_UnhandledException;



......

MainPage.xaml

using System;

using System.Collections.Generic;

using System.Linq;

using System.Net;

using System.Windows;

using System.Windows.Controls;

using System.Windows.Documents;

using System.Windows.Input;

using System.Windows.Media;

using System.Windows.Media.Animation;

using System.Windows.Shapes;

using Microsoft.Phone.Controls;

using Microsoft.Phone.Tasks;

using System.Windows.Navigation;



namespace PhotoApp

{

    public partial class MainPage : PhoneApplicationPage

    {

        PhotoChooserTask photoChooserTask;



        // Constructor

        public MainPage()

        {

            InitializeComponent();

            photoChooserTask = new PhotoChooserTask();

            photoChooserTask.Completed += new EventHandler<PhotoResult>(photoChooserTask_Completed);

        }



        void photoChooserTask_Completed(object sender, PhotoResult e)

        {

            if (e.TaskResult == TaskResult.OK)

            {

                App.globalData.bitmapImage.SetSource(e.ChosenPhoto);

                //NavigationService.Navigate(new Uri("/PhotoPage.xaml", UriKind.Relative));

                NavigationService.Navigated += new NavigatedEventHandler(navigateCompleted);

            }

        }



        void navigateCompleted(object sender, EventArgs e)

        {

            //Do the delayed navigation from the main page

            this.NavigationService.Navigate(new Uri("/PhotoPage.xaml", UriKind.Relative));

            NavigationService.Navigated -= new NavigatedEventHandler(navigateCompleted);

        }



        /// <summary>

        /// 选照片

        /// </summary>

        /// <param name="sender"></param>

        /// <param name="e"></param>

        private void button1_Click(object sender, RoutedEventArgs e)

        {

            photoChooserTask.Show();

        }





    }

}

PhotoPage.xaml

using System;

using System.Collections.Generic;

using System.Linq;

using System.Net;

using System.Windows;

using System.Windows.Controls;

using System.Windows.Documents;

using System.Windows.Input;

using System.Windows.Media;

using System.Windows.Media.Animation;

using System.Windows.Shapes;

using Microsoft.Phone.Controls;



namespace PhotoApp

{

    public partial class PhotoPage : PhoneApplicationPage

    {

        public PhotoPage()

        {

            InitializeComponent();

        }



        protected override void OnNavigatedTo(System.Windows.Navigation.NavigationEventArgs e)

        {

            base.OnNavigatedTo(e);

            image1.Source = App.globalData.bitmapImage;

        }

    }

}