今天做了一个用AE来控制图层是否显示标注，以及已哪一个字段作为标注的字段，以哪一个字段作为标注的角度，现将代码写下来，以备以后差用。
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); } }