ArcGIS Pro获得一个图层的样式

private CIMPointSymbol GetPointSymbolFromLayer(Layer layer)
        {
            if (!(layer is FeatureLayer)) return null;
            var fLyr = layer as FeatureLayer;
            var renderer = fLyr.GetRenderer() as CIMSimpleRenderer;
            if (renderer == null || renderer.Symbol == null) return null;
            return renderer.Symbol.Symbol as CIMPointSymbol;
        }