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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);
 }
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