将图像拖放到画布上

Question

我使用以下代码在画布上显示图像

void Stickers1_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
    var selecteditem = e.AddedItems[0] as StickersImageListModel;
    {
        Stickers1.Visibility = Visibility.Collapsed;
        Image imageitem = new Image();
        BitmapImage image = new BitmapImage(new System.Uri(selecteditem.Imageurl, UriKind.Absolute));
        imageitem.Source = image;
        my_canvas.Children.Add(imageitem);
        imageitem.AllowDrop = true;
    }
    my_canvas.Visibility = Visibility.Visible;
}

现在我想将这些图像拖放到我的画布上，请帮助我这样做，我试过这个

private Image _imageUrl;
public Image Imageurl
{
    get { return _imageUrl; }
    set { _imageUrl = value; }
}

private void my_canvas_ManipulationDelta(object sender, ManipulationDeltaRoutedEventArgs e)
{
    if ((e.Position.X > Canvas.GetLeft(Imageurl) && e.Position.X < Canvas.GetLeft(Imageurl) + Imageurl.Width)
       || (e.Position.Y > Canvas.GetTop(Imageurl) && e.Position.Y < Canvas.GetTop(Imageurl) + Imageurl.Height))
    {
        {
            Canvas.SetLeft(Imageurl, e.Position.X);
            Canvas.SetTop(Imageurl, e.Position.Y);
        }
    }
}