SuperMap.Web.Mapping.DynamicLayer.GetSourceCompleted C# (CSharp) Method

        private void GetSourceCompleted(ImageSource imgSrc, bool useTransitions, int id)
        {
            if (id == this.requestID)
            {
                if (imgSrc == null || ViewBounds.IsEmpty)
                {
                    base.Container.Children.Clear();
                    this.OnProgress(100);
                }
                else
                {
                    Image img = new Image
                    {
                        IsHitTestVisible = false,
                        Opacity = 1.0,
                        DataContext = useTransitions,
                    };
                    img.SetValue(Image.StretchProperty, Stretch.Fill);//模糊吗?
                    LayerContainer.SetBounds(img, ViewBounds);

                    img.ImageFailed += new EventHandler<ExceptionRoutedEventArgs>(this.Img_ImageFailed);
                    bool flag = (imgSrc is BitmapImage) && ((imgSrc as BitmapImage).UriSource != null) && !string.IsNullOrEmpty((imgSrc as BitmapImage).UriSource.OriginalString);
                    if (flag)
                    {
                        EventHandler<DownloadProgressEventArgs> onProgressEventHandler = null;
                        onProgressEventHandler = delegate(object sender, DownloadProgressEventArgs e)
                        {
                            this.bitmap_DownloadProgress(sender, e, img, onProgressEventHandler, id);
                        };
                        (imgSrc as BitmapImage).DownloadProgress += onProgressEventHandler;
                    }
                    img.Source = imgSrc;
                    base.Container.Children.Add(img);
                    if (!flag)
                    {
                        this.ShowImage(img);
                        this.OnProgress(100);
                    }
                }
            }
        }