获取图层符号ISymbol

///

        /// 获取图层的默认符号

        ///

        /// 要获取默认符号的图层

        /// 只有分类渲染才用到此参数

        /// 只有分类渲染才用到此参数

        /// ISymbol

        public static ISymbol GetLayerSymbol(ILayer pLayer, string legendGroupHeading, string legendClassLabel)

        {

            ISymbol pSymbol = null;

            if ((pLayer != null) || (pLayer.Valid))

            {

                if (pLayer is IFeatureLayer)

                {

                    IFeatureLayer pFeatureLayer = pLayer as IFeatureLayer;

                    IGeoFeatureLayer pGeoFeatureLayer = pFeatureLayer as IGeoFeatureLayer;

                    IFeatureRenderer pFeatureRenderer = pGeoFeatureLayer.Renderer;

                    if (pFeatureRenderer is ISimpleRenderer)

                    {

                        ISimpleRenderer pTmpSimpleRenderer = pFeatureRenderer as ISimpleRenderer;

                        pSymbol = pTmpSimpleRenderer.Symbol;

                    }

                    else if (pFeatureRenderer is IUniqueValueRenderer)

                    {

                        IUniqueValueRenderer pUniqueValueRenderer = pFeatureRenderer as IUniqueValueRenderer;

                        pSymbol = pUniqueValueRenderer.DefaultSymbol;

                    }

                    else if (pFeatureRenderer is IClassBreaksRenderer)

                    {

                        ILegendClass pLegendClass = OperatorLayer.GetLegendClass(pLayer, legendGroupHeading, legendClassLabel);

                        pSymbol = pLegendClass.Symbol;

                    }

                }

            }

            return pSymbol;

        }

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