/// <summary>
        /// 以URL的形式打开图片
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private async void MainImage_ImageOpened(object sender, RoutedEventArgs e)
        {
            size_image = new Size((MainImage.Source as BitmapImage).PixelWidth, (MainImage.Source as BitmapImage).PixelHeight);

            faces = await cognitiveService.GetFacesFromUri(imageLocation.Text);

            emotions = await cognitiveService.GetEmotionsFromUri(imageLocation.Text);

            if (faces != null)
            {
                DisplayFaces(faces);
            }
            if (emotions != null)
            {
                DisplayEmotions(emotions);
            }
            LoadingRing.IsActive = false;
        }