为图层增加注记表达式

从注记表达式的文本文件中程序里读取并动态地增加注记。label expression 可以为简单的或vb脚本等

/// <summary>

        /// 图层增加注记表达式

        /// </summary>

        /// <param name="map">The map.</param>

        /// <param name="tcname">The tcname.</param>

        public static void AddAnno(ILayer plyr , string tcname)

        {

            if (!System.IO.File.Exists(注记文件存储路径))

                return;

                        IGeoFeatureLayer pGeoFeaLayer = (plyr as IFeatureLayer) as IGeoFeatureLayer;

                        IAnnotateLayerPropertiesCollection pAnoLayPC = pGeoFeaLayer.AnnotationProperties;

                        pAnoLayPC.Clear();

 

                        ILabelEngineLayerProperties pAnnoLayerProps = new LabelEngineLayerPropertiesClass();

                        (pAnnoLayerProps.BasicOverposterLayerProperties as IOverposterLayerProperties2).TagUnplaced = false;  ////是否覆盖，对应Arcmap：layer properties-》labels-》placement properties-》conflict detection ：：place overlapping labels

                        pAnnoLayerProps.SymbolID = 0;

                        IBasicOverposterLayerProperties4 blp = pAnnoLayerProps.BasicOverposterLayerProperties as IBasicOverposterLayerProperties4;

                        //blp.PointPlacementMethod = esriOverposterPointPlacementMethod.esriAroundPoint;

                        

                        blp.NumLabelsOption = esriBasicNumLabelsOption.esriOneLabelPerShape; ////每个图形只标注一个  label properties--palcement properties--duplicate labels

                        blp.PolygonPlacementMethod = esriOverposterPolygonPlacementMethod.esriAlwaysHorizontal; //// label properties--palcement properties--polygon settings

                        // blp.PlaceOnlyInsidePolygon = true;  ////保证在图形内部  label properties--palcement properties--only place label inside polygon

 

 

                        string annoExpression = GetAnnoExpression(注记文件存储路径);

                        if (annoExpression.ToUpper().IndexOf("FUNCTION") >= 0)

                            pAnnoLayerProps.IsExpressionSimple = false;

                        else

                            pAnnoLayerProps.IsExpressionSimple = true; //对应aArcMap的advanced选项

                        pAnnoLayerProps.Expression = annoExpression;

 

                        pAnnoLayerProps.Symbol = CreateTextSymbol();

                        pGeoFeaLayer.DisplayAnnotation = true;

        }

 

/// <summary>

        /// 根据注记文件存储路径获取标注表达式

        /// </summary>

        /// <param name="tcname">The tcname.</param>

        /// <returns></returns>

        public static string GetAnnoExpression(string注记文件存储路径)

        {

            StreamReader sr = new StreamReader(注记文件存储路径);

            string annoExpression = string.Empty;

            while (!sr.EndOfStream)

            {

                string text = sr.ReadLine();

                if (annoExpression == string.Empty)

                    annoExpression = text;

                else

                    annoExpression = annoExpression + "
" + text;

            }

            return annoExpression;

        }