public void  modifyLayerSymbol()
        {
            //修改图层标注大小
            ILayer pLKXlayer = SurveyExtensionClass.GetLayerByName(ReadConfig.GetValue("LayerName", "注记线"), null);
            IGeoFeatureLayer pGeoLayer = pLKXlayer as IGeoFeatureLayer;
            IAnnotateLayerPropertiesCollection IPALPColl = pGeoLayer.AnnotationProperties;

            IAnnotateLayerProperties tAnnotateLayerProperties = null;
            IElementCollection tElementCollection = null;
            if (IPALPColl.Count > 0)
            {
                IPALPColl.QueryItem(4, out tAnnotateLayerProperties, out tElementCollection, out tElementCollection);
                ILabelEngineLayerProperties tLabelEngineLayerProperties = tAnnotateLayerProperties as ILabelEngineLayerProperties;
                tLabelEngineLayerProperties.Symbol.Size = 24;
            }
        }