ArcEngine图层标注源码

        public void EnableFeatureLayerLabel(IFeatureLayer pFeaturelayer, string sLableField, IRgbColor pRGB, int size, string angleField)
        {
            //判断图层是否为空
            if (pFeaturelayer == null)
                return;
            IGeoFeatureLayer pGeoFeaturelayer = (IGeoFeatureLayer)pFeaturelayer;
            IAnnotateLayerPropertiesCollection pAnnoLayerPropsCollection;
            pAnnoLayerPropsCollection = pGeoFeaturelayer.AnnotationProperties;
            pAnnoLayerPropsCollection.Clear();

            //stdole.IFontDisp  pFont; //字体
            ITextSymbol pTextSymbol;

            //pFont.Name = "新宋体";
            //pFont.Size = 9;
            //未指定字体颜色则默认为黑色
            if (pRGB == null)
            {
                pRGB = new RgbColorClass();
                pRGB.Red = 0;
                pRGB.Green = 0;
                pRGB.Blue = 0;
            }

            pTextSymbol = new TextSymbolClass();
            pTextSymbol.Color = (IColor)pRGB;
            pTextSymbol.Size = size; //标注大小

            IBasicOverposterLayerProperties4 pBasicOverposterlayerProps4 = new BasicOverposterLayerPropertiesClass();
            switch (pFeaturelayer.FeatureClass.ShapeType)//判断图层类型
            {
                case ESRI.ArcGIS.Geometry.esriGeometryType.esriGeometryPolygon:
                    pBasicOverposterlayerProps4.FeatureType = esriBasicOverposterFeatureType.esriOverposterPolygon;
                    break;
                case ESRI.ArcGIS.Geometry.esriGeometryType.esriGeometryPoint:
                    pBasicOverposterlayerProps4.FeatureType = esriBasicOverposterFeatureType.esriOverposterPoint;
                    break;
                case ESRI.ArcGIS.Geometry.esriGeometryType.esriGeometryPolyline:
                    pBasicOverposterlayerProps4.FeatureType = esriBasicOverposterFeatureType.esriOverposterPolyline;
                    break;
            } 
            pBasicOverposterlayerProps4.PointPlacementMethod = esriOverposterPointPlacementMethod.esriRotationField;
            pBasicOverposterlayerProps4.RotationField = angleField;

            ILabelEngineLayerProperties pLabelEnginelayerProps = new LabelEngineLayerPropertiesClass(); 
            pLabelEnginelayerProps.Expression = "[" + sLableField + "]";
            pLabelEnginelayerProps.Symbol = pTextSymbol;
            pLabelEnginelayerProps.BasicOverposterLayerProperties = pBasicOverposterlayerProps4 as IBasicOverposterLayerProperties;
            pAnnoLayerPropsCollection.Add((IAnnotateLayerProperties)pLabelEnginelayerProps);
            pGeoFeaturelayer.DisplayAnnotation = true;//很重要，必须设置 
            //axMapControl1.ActiveView.PartialRefresh(esriViewDrawPhase.esriViewBackground, null, null); }
        }