用AE來控制圖層是否顯示標註，以及已哪一個欄位作為標註的欄位，以哪一個欄位作為標註的角度，現將程式碼寫下來，以備以後差用。

1. publicvoid EnableFeatureLayerLabel(IFeatureLayer pFeaturelayer, string sLableField, IRgbColor pRGB, int size, string angleField)  
2. {  
3.     //判斷圖層是否為空
4.     if (pFeaturelayer == null)  
5.         return;  
6.     IGeoFeatureLayer pGeoFeaturelayer = (IGeoFeatureLayer)pFeaturelayer;  
7.     IAnnotateLayerPropertiesCollection pAnnoLayerPropsCollection;  
8.     pAnnoLayerPropsCollection = pGeoFeaturelayer.AnnotationProperties;  
9.     pAnnoLayerPropsCollection.Clear();  
10.     //stdole.IFontDisp  pFont; //字型
11.     ITextSymbol pTextSymbol;  
12.     //pFont.Name = "新宋體";
13.     //pFont.Size = 9;
14.     //未指定字型顏色則預設為黑色
15.     if (pRGB == null)  
16.     {  
17.         pRGB = new RgbColorClass();  
18.         pRGB.Red = 0;  
19.         pRGB.Green = 0;  
20.         pRGB.Blue = 0;  
21.     }  
22.     pTextSymbol = new TextSymbolClass();  
23.     pTextSymbol.Color = (IColor)pRGB;  
24.     pTextSymbol.Size = size; //標註大小
25.     IBasicOverposterLayerProperties4 pBasicOverposterlayerProps4 = new
     BasicOverposterLayerPropertiesClass();  
26.     switch (pFeaturelayer.FeatureClass.ShapeType)//判斷圖層型別
27.     {  
28.         case ESRI.ArcGIS.Geometry.esriGeometryType.esriGeometryPolygon:  
29.             pBasicOverposterlayerProps4.FeatureType = esriBasicOverposterFeatureType.esriOverposterPolygon;  
30.             break;  
31.         case ESRI.ArcGIS.Geometry.esriGeometryType.esriGeometryPoint:  
32.             pBasicOverposterlayerProps4.FeatureType = esriBasicOverposterFeatureType.esriOverposterPoint;  
33.             break;  
34.         case ESRI.ArcGIS.Geometry.esriGeometryType.esriGeometryPolyline:  
35.             pBasicOverposterlayerProps4.FeatureType = esriBasicOverposterFeatureType.esriOverposterPolyline;  
36.             break;  
37.     }   
38.     pBasicOverposterlayerProps4.PointPlacementMethod = esriOverposterPointPlacementMethod.esriRotationField;  
39.     pBasicOverposterlayerProps4.RotationField = angleField;  
40.     ILabelEngineLayerProperties pLabelEnginelayerProps = new LabelEngineLayerPropertiesClass();   
41.     pLabelEnginelayerProps.Expression = "[" + sLableField + "]";  
42.     pLabelEnginelayerProps.Symbol = pTextSymbol;  
43.     pLabelEnginelayerProps.BasicOverposterLayerProperties = pBasicOverposterlayerProps4 as IBasicOverposterLayerProperties;  
44.     pAnnoLayerPropsCollection.Add((IAnnotateLayerProperties)pLabelEnginelayerProps);  
45.     pGeoFeaturelayer.DisplayAnnotation = true;//很重要，必須設定 
46.     //axMapControl1.ActiveView.PartialRefresh(esriViewDrawPhase.esriViewBackground, null, null); }
47. }