学步园

根据图层获取要素的渲染颜色

public IColor GetFeatureLayerColor(IFeatureLayer pFeatureLayer,IFeature pFeature)
        {
            if (pFeature == null || pFeature == null) return null;
            IColor _result = new RgbColorClass();
            IGeoFeatureLayer pGeoFT = pFeatureLayer as IGeoFeatureLayer;
            IFeatureRenderer pFeatureRender = pGeoFT.Renderer;
            if (pFeatureRender != null)
            {
                if (pFeatureLayer.FeatureClass.ShapeType == esriGeometryType.esriGeometryPolyline)
                {
                    ILineSymbol pLineSymbol = null;
                    pLineSymbol = (ILineSymbol)pFeatureRender.get_SymbolByFeature(pFeature);
                    _result = pLineSymbol.Color;
                }
                else if (pFeatureLayer.FeatureClass.ShapeType == esriGeometryType.esriGeometryPolygon)
                {
                    IFillSymbol pFillSymboll = (IFillSymbol)pFeatureRender.get_SymbolByFeature(pFeature);
                    _result = pFillSymboll.Color;
                }
                else if (pFeatureLayer.FeatureClass.ShapeType == esriGeometryType.esriGeometryPoint)
                {
                    IMarkerSymbol pMarkerSymbol = (IMarkerSymbol)pFeatureRender.get_SymbolByFeature(pFeature);
                    _result = pMarkerSymbol.Color;
                }
            }
            return _result;
        }
通过IFeatureRender.get_SymbolByFeature(IFeature pFeature)方法获取要素的渲染方式，再根据不同类型图层的渲染方法转换到相应的接口获取颜色。