ArcMap中有一个功能是Label Features，就是可以将图层内指定字段值显示以Label形式显示在主窗口上，在Label Features后，用右键点击图层，发现可以出现一个原来灰色的功能名，ConvertLabelsToAnnotation。这个功能在AE中提供，可是自己找不到设定字段值的位置，无可奈何，只有另辟蹊径。

就是先创建一个注记层，然后按照图层里指定字段的值来生成注记。就是一个一个Feature点转换。可能会比AE提供的接口效率低，没有办法，自己不会用那个接口，也就只能这样勉强的用着了。这个方面最难点就是创建一个新的注记图层，有很多属性需要设置，比较麻烦，下面是代码

  private void ConvertToAnnotationLayer(IMap pMap, ILayer pLayer, string fieldname, esriGeometryType type)
        ...{
            IFeatureLayer pFeatLayer = pLayer as IFeatureLayer;

            int i = pFeatLayer.FeatureClass.FindField("SHAPE");
            IField pShapeField = pFeatLayer.FeatureClass.Fields.get_Field(i);
            IDataset pDataSet = pFeatLayer.FeatureClass as IDataset;
            IWorkspace pWS = pDataSet.Workspace;
            IFeatureWorkspace pFeatWS = pWS as IFeatureWorkspace;


            IGeoFeatureLayer pGeoFeatLayer = pFeatLayer as IGeoFeatureLayer;
            IFields pFields = pGeoFeatLayer.FeatureClass.Fields;

            IAnnotationLayerFactory pAnnoLayerFact = new FDOGraphicsLayerFactoryClass();
            IGraphicsLayerScale pGraphyScale = new GraphicsLayerScaleClass();
            pGraphyScale.ReferenceScale = 200000;
            pGraphyScale.Units = esriUnits.esriMeters;
            IAnnotationLayer pAnnoLayer = null;

            ISymbolCollection2 pSymColl = new SymbolCollectionClass();
            IFormattedTextSymbol pTextSymbol = new TextSymbolClass();
            IRgbColor pRGB = new RgbColorClass();
            pRGB.Red = 0;
            pRGB.Blue = 0;
            pRGB.Green = 0;
            pTextSymbol.Color = pRGB;
            
      /**//*      pTextSymbol.Font=*/

         
            m_FontDisp.Size=8;           
            pTextSymbol.Font =m_FontDisp ;
            pTextSymbol.HorizontalAlignment = esriTextHorizontalAlignment.esriTHACenter;
            pTextSymbol.VerticalAlignment = esriTextVerticalAlignment.esriTVABaseline;
            pTextSymbol.CharacterSpacing = 100;
            pTextSymbol.CharacterWidth = 50;
            pTextSymbol.WordSpacing = 100;
            
   //         IBoundsProperties pBoundProp = pTextSymbol as IBoundsProperties;
           /**//* pBoundProp.FixedSize = false;*/
  //          pBoundProp.FixedAspectRatio = true;
            ISymbol pSymbol = pTextSymbol as ISymbol;
            ISymbolIdentifier2 pSymident2;
            pSymColl.AddSymbol(pSymbol, fieldname, out pSymident2);
            ISymbolCollection pSymColl1= pSymColl as ISymbolCollection;

            IOverposterProperties pOverpost = new BasicOverposterPropertiesClass();

            IAnnotateLayerPropertiesCollection pAnnoPropColl = new AnnotateLayerPropertiesCollectionClass();
            IAnnotateLayerProperties pAnnoProp;
            ILabelEngineLayerProperties2 pLabelEngine=new LabelEngineLayerPropertiesClass();
            pLabelEngine.AnnotationClassID = 0;
            pLabelEngine.Symbol = pTextSymbol;
            pLabelEngine.SymbolID = pSymident2.ID;
            pAnnoProp = pLabelEngine as IAnnotateLayerProperties;
            pAnnoProp.Class = pLayer.Name + fieldname;
            pAnnoProp.LabelWhichFeatures = esriLabelWhichFeatures.esriAllFeatures;
            pAnnoProp.Priority = 0;
            IActiveView pActView=pMap as  IActiveView;
            pAnnoProp.GraphicsContainer = pActView.GraphicsContainer;
            pAnnoProp.FeatureLayer = pFeatLayer;
            pAnnoProp.FeatureLinked = true;
            pAnnoProp.AnnotationMaximumScale = 10000000000000000000;
            pAnnoProp.AnnotationMinimumScale = 0.00000000001;
            pAnnoPropColl.Add(pAnnoProp);
            try
            ...{
               pAnnoLayer=pAnnoLayerFact.CreateAnnotationLayer(pFeatWS, pFeatLayer.FeatureClass.FeatureDataset, pLayer.Name + "_A_" + fieldname, pShapeField.GeometryDef,
                 null, pAnnoPropColl,pGraphyScale,pSymColl1 , false, false, false, true, pOverpost, "");

            }
            catch (Exception s)
            ...{
                string mes = s.Message;
            }
            if (pAnnoLayer == null)
                return;
            int num=pFields.FindField(fieldname);
            ConvertToAnnotateByFeature(pLayer, num, ref pAnnoLayer);
            pMap.AddLayer(pAnnoLayer as ILayer);
        }