WP8 MediaLibrary,在LongListMultiSelector中查看照片

时间:2013-11-15 08:25:02

标签: windows-phone-8

我需要在LongListMultiSelector中显示我的设备(WP8)中的所有照片。 我用这个方法

 MediaPlayer.Queue.ToString();
        MediaLibrary mediaLibrary;
        PictureAlbum cameraRoll = null;


        foreach (MediaSource source in MediaSource.GetAvailableMediaSources())
        {
            if (source.MediaSourceType == MediaSourceType.LocalDevice)
            {
                mediaLibrary = new MediaLibrary(source);
                PictureAlbumCollection allAlbums = mediaLibrary.RootPictureAlbum.Albums;
                foreach (PictureAlbum album in allAlbums)
                {
                    if (album.Name == "Camera Roll")
                    {
                        cameraRoll = album;
                    }
                }
            }
        }

        List<BitmapImage> lstBitmapImage = new List<BitmapImage>();
        foreach (Picture p in cameraRoll.Pictures)
        {
            BitmapImage b = new BitmapImage();
            b.SetSource(p.GetThumbnail());
            lstBitmapImage.Add(b);
        }


        PhotoHubLLS.ItemsSource = lstBitmapImage;

在XAML中我有这个图像设置

<Image HorizontalAlignment="Left" Margin="6,6,0,0" Name="image1" Stretch="Fill" VerticalAlignment="Top" Source="{Binding}"/>

这一切都很完美,但我有一些问题。

我想放大单张图片,在图片点按我插入此代码

FrameworkElement fe = sender as FrameworkElement;
        if (fe != null)
        {
            CurrentPicture = fe.DataContext as Picture;
        }

但是null为datacontext,因为我使用了“Source”。

我该怎么办?

1 个答案:

答案 0 :(得分:0)

这取决于您连接的事件。如果您正在处理SelectionChanged事件,则可以从SelectionChangedEventArgs事件参数参数中的AddedItems集合中检索BitmapImage(而不是Picture):

private void LongListSelector_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
    if (e.AddedItems.Count > 0)
    {
        BitmapImage bmp = e.AddedItems[0] as BitmapImage;
    }
}

或者,如果您正在处理LongListSelector的ItemTemplate中的Image元素的Tap事件,那么您可以从sender参数中检索BitmapImage:

Image imgElement = sender as Image;
BitmapImage bmp = imgElement.Source as BitmapImage;