<Grid x:Name="TitleGrid" Grid.Row="0">
    <TextBlock Text="Challenge Windows Phone 7" x:Name="textBlockPageTitle" Style="{StaticResource PhoneTextPageTitle1Style}"/>
    <TextBlock Text="Epreuve 3" x:Name="textBlockListTitle" Style="{StaticResource PhoneTextPageTitle2Style}"/>
</Grid>

xmlns:shell="clr-namespace:Microsoft.Phone.Shell;assembly=Microsoft.Phone.Shell"

<phoneNavigation:PhoneApplicationPage.ApplicationBar>
    <shell:ApplicationBar IsVisible="True">
        <shell:ApplicationBar.Buttons>
            <shell:ApplicationBarIconButton IconUri="/Images/appbar.back.rest.png" Click="buttonPreviousPicture_Click" IsEnabled="False" />
            <shell:ApplicationBarIconButton IconUri="/Images/appbar.save.rest.png" Click="buttonDownloadPictures_Click" IsEnabled="True" />
            <shell:ApplicationBarIconButton IconUri="/Images/appbar.next.rest.png" Click="buttonNextPicture_Click" IsEnabled="False" />
        </shell:ApplicationBar.Buttons>            
    </shell:ApplicationBar>
</phoneNavigation:PhoneApplicationPage.ApplicationBar>

private void buttonDownloadPictures_Click(object sender, EventArgs e)
{
}

private void buttonPreviousPicture_Click(object sender, EventArgs e)
{
}

private void buttonNextPicture_Click(object sender, EventArgs e)
{
}

private string _pictureName = "epreuve3picture{0}";
private int _CountPictures = 0;
private int _CurrentPicture = 1;

using Etape3ChallengeWP7.ServiceEpreuve3;
using System.ComponentModel;

private void buttonDownloadPictures_Click(object sender, EventArgs e)
{
	// initialisation des compteurs
	_CountPictures = 0;
	_CurrentPicture = 1;
	
	// désactivation des boutons
	((ApplicationBarIconButton)ApplicationBar.Buttons[0]).IsEnabled = false;
	((ApplicationBarIconButton)ApplicationBar.Buttons[1]).IsEnabled = false;
	((ApplicationBarIconButton)ApplicationBar.Buttons[2]).IsEnabled = false;
	
	// création du client du service WCF
	var client = new ServiceEpreuve3.Epreuve3SoapClient();
	
	// affectation des événements
	client.GetStep3ImageCompleted += new EventHandler<GetStep3ImageCompletedEventArgs>(client_GetStep3ImageCompleted);
	client.CloseCompleted += new EventHandler<AsyncCompletedEventArgs>(client_CloseCompleted);
	
	// on appelle ensuite le service web pour les six images
	for (int i = 1; i < 7; i++)
	{
	    client.GetStep3ImageAsync(i, new ProxyRequestData(client, i));
	}
}

public class ProxyRequestData
{
    public ProxyRequestData(ServiceEpreuve3.Epreuve3SoapClient client, int picturePosition)
    {
        this.Client = client;
        this.PicturePosition = picturePosition;
    }
    public ServiceEpreuve3.Epreuve3SoapClient Client { get; set; }
    public int PicturePosition { get; set; }
}

private void client_GetStep3ImageCompleted(object sender, ServiceEpreuve3.GetStep3ImageCompletedEventArgs e)
{
	if (e.Result == null) return;

    ProxyRequestData data = (ProxyRequestData)e.UserState;

    lock (data.Client)
    {
        if (e.Cancelled == true || e.Error != null)
        {
            if (data.Client.State == System.ServiceModel.CommunicationState.Opened)
                data.Client.CloseAsync();
            return;
        }
        
        var fileName = string.Format(_pictureName, data.PicturePosition);
        
        using (var appStorage = IsolatedStorageFile.GetUserStoreForApplication())
        { 
			if (appStorage.FileExists(fileName))
            {
                appStorage.DeleteFile(fileName);
            }
            using (var stream = new IsolatedStorageFileStream(fileName, FileMode.CreateNew, appStorage))
            {
                stream.Write(e.Result, 0, e.Result.Length);
            }
        }

        _CountPictures++;

		// on ne récupère que six images, et on appelle la méthode Close
         if (_CountPictures == 6)
        {
            data.Client.CloseAsync();
        }
    }
}

private void client_CloseCompleted(object sender, System.ComponentModel.AsyncCompletedEventArgs e)
{
    MessageBox.Show(string.Format("{0} photos ont été téléchargées !", _CountPictures),
        "Résultat", MessageBoxButton.OK);

    ((ApplicationBarIconButton)ApplicationBar.Buttons[0]).IsEnabled = true;
    ((ApplicationBarIconButton)ApplicationBar.Buttons[1]).IsEnabled = false;
    ((ApplicationBarIconButton)ApplicationBar.Buttons[2]).IsEnabled = true;

    DisplayCurrentPicture();
}

<Grid x:Name="ContentGrid" Grid.Row="1">
    <Image HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Stretch="Uniform"	 
            Name="imageDisplay"
            Width="468" Margin="6,6,0,32" />
</Grid>
}

private void DisplayCurrentPicture()
{
    var fileName = string.Format(_pictureName, _CurrentPicture);
    byte[] data;

	// récupération des données dans l'Isolated Storage
    using (var storage = IsolatedStorageFile.GetUserStoreForApplication())
    {
        if (!storage.FileExists(fileName)) return;

        using (var file = storage.OpenFile(fileName, FileMode.Open))
        {
            data = new byte[file.Length];
            file.Read(data, 0, data.Length);
        }
    }

	// transformation du flux de données en image
    var image = new BitmapImage();
    using (var stream = new MemoryStream(data))
    {
        image.SetSource(stream);
    }

	// affectation de l'image au contrôle
    imageDisplay.Source = image;
}

 private void buttonPreviousPicture_Click(object sender, EventArgs e)
{
    // notre première image à l'index 1
    if (_CurrentPicture < 2) return;

    _CurrentPicture--;
    DisplayCurrentPicture();
}

private void buttonNextPicture_Click(object sender, EventArgs e)
{
    if (_CurrentPicture >= _CountPictures) return;

    _CurrentPicture++;
    DisplayCurrentPicture();
}