SuperMap.WindowsPhone.Mapping.Map.LoadContinuousLayersInView C# (CSharp) Method

        private void LoadContinuousLayersInView(bool useTransitions)
        {
            Rectangle2D bounds = this.GetFullViewBounds();
            if (this.Layers != null && !Rectangle2D.IsNullOrEmpty(bounds))
            {
                foreach (Layer layer in this.Layers)
                {
                    if (layer.ContinuousDraw)
                    {
                        this.LoadLayerInView(useTransitions, bounds, layer);
                    }//TiledLayer和FeaturesLayer ?ElementsLayer?
                }
            }
        }
        private void LoadLayerInView(bool useTransitions, Rectangle2D drawBounds, Layer layer)