Question

I have an application with only one button. When user clicks the button, a photo chooser should be launched.

The following is my code

PhotoChooserTask photoChooserTask;
BitmapImage image;

Page_Launch event
{
      this.photoChooserTask = new PhotoChooserTask();
      this.photoChooserTask.ShowCamera = true;
      this.photoChooserTask.PixelHeight = 100;
      this.photoChooserTask.PixelWidth = 100;
      this.photoChooserTask.Completed += new EventHandler<PhotoResult>(photoChooserTask_Completed);
}

button_click event
{
    this.photoChooserTask.Show();
}

private void photoChooserTask_Completed(object sender, PhotoResult e)
{
    this.image = new BitmapImage();
    this.image.SetSource(e.ChosenPhoto);
}

Everything is fine when I start debuging on WP emulator. I can choose a photo from photo library or capture one, crop and save the photo. But when I run debuging on my WP device, I always get e.ChosenPhoto ArgumentNullException error after clicking the button.

Has anyone got same issue?

Answer 1

Are you writing this code in the Application launch event ??

Did you tried by adding the photochoosertask in a page.

try this pasting in to the MyPage.xaml.cs file

 public partial class MainPage : PhoneApplicationPage
    {
        PhotoChooserTask photoChooserTask;
        BitmapImage image;

        // Constructor
        public MainPage()
        {
            InitializeComponent();
            this.photoChooserTask = new PhotoChooserTask();
            this.photoChooserTask.ShowCamera = true;
            this.photoChooserTask.PixelHeight = 100;
            this.photoChooserTask.PixelWidth = 100;
            this.photoChooserTask.Completed += new EventHandler<PhotoResult>(photoChooserTask_Completed);
        }

        private void button1_Click(object sender, RoutedEventArgs e)
        {
            this.photoChooserTask.Show();
        }

        private void photoChooserTask_Completed(object sender, PhotoResult e)
        {
           if (e.TaskResult == TaskResult.OK && e.ChosenPhoto != null)
            {
                this.image = new BitmapImage();
                this.image.SetSource(e.ChosenPhoto);
            }
        }
    }