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);
}
   private bool ConvertToAnnotateByFeature(ILayer pLayer,int fieldnum,ref IAnnotationLayer pAnnoLayer)
{
    IFeatureLayer pFeatlayer = pLayer as IFeatureLayer;
    if (pFeatlayer == null)
        return false;
    IFeatureClass pFeatClass = pFeatlayer.FeatureClass;
    IFeatureCursor pFeatCursor = pFeatClass.Search(null, false);
    IFeature pFeat = pFeatCursor.NextFeature();

    IFeatureLayer pAnnoFeatLayer=pAnnoLayer as IFeatureLayer;
    IAnnotationClassExtension pAnnotateExten = pAnnoFeatLayer.FeatureClass.Extension as IAnnotationClassExtension;
    ISymbol pSymbol = pAnnotateExten.SymbolCollection.get_Symbol(0);
    IGeometry pGeo;
    double angle = 0;
    IRgbColor pRGB=new RgbColorClass();
    pRGB.Blue=255;
    pRGB.Green=255;
    pRGB.Red=0;
    /////判断是不是公路层的Width，特殊处理/////
    string temp_layername = pLayer.Name.ToUpper();
    bool bwidth=false;
    if(pFeatClass.Fields.get_Field(fieldnum).Name.ToUpper()=="WIDTH")
    {
        if (pLayer.Name.ToUpper().Contains("LRDL"))
            bwidth = true;
    }   
    IElementCollection pElementColl = new ElementCollectionClass();
    pAnnoLayer.BeginAddElements();
    while(pFeat!=null)
    {
        pGeo = pFeat.Shape;
        IPoint pLabelPoint = null;
        if(pGeo is IPolyline)
        {
            IPolyline pline=pGeo as IPolyline;
            pLabelPoint = GetLabelPoint(pline);
        }
        if(pGeo is IPoint)
        {
            pLabelPoint = pGeo as IPoint;
        }
        if(pGeo is IPolygon)
        {
            IPolygon pPolygon = pGeo as IPolygon;
            IArea pArea = pPolygon as IArea;
            pLabelPoint = pArea.LabelPoint;
        }
        object val=pFeat.get_Value(fieldnum);
        string s=val.ToString();
        if (s == null || s.Length == 0)
        {
            pFeat = pFeatCursor.NextFeature();
            continue;
        }
        ///对公路的宽度进行特殊处理
        if(bwidth)
        {
            
            double width = double.Parse(s);
            int rtegnum = pFeatClass.FindField("RTEG");
            string rteg = pFeat.get_Value(rtegnum).ToString();
            if(rteg=="高速"&&width>55.0)
            {
                IElement pElement = MakeTextElement(pGeo, angle, s, pRGB, pSymbol);
                pElementColl.Add(pElement, pFeat.OID);
            }
            else if(width>40.0)
            {
                IElement pElement = MakeTextElement(pGeo, angle, s, pRGB, pSymbol);
                pElementColl.Add(pElement, pFeat.OID);
            }
        }
        else if (/*pLabelPoint != null&&*/s.Length>0)
        {
            IElement pElement = MakeTextElement(pGeo, angle, s, pRGB,pSymbol);                    
            pElementColl.Add(pElement, pFeat.OID);
        }
        pFeat = pFeatCursor.NextFeature();
    }
    pAnnoLayer.EndAddElements();
    pAnnoLayer.BeginAddElements();
    if(pElementColl.Count<1)
    {
        pAnnoLayer.EndAddElements();
        return true;
    }
    pAnnoLayer.DoAddElements(pElementColl, 0);
 /*   pAnnoLayer.SetupAttributeConversion()*/
    pAnnoLayer.EndAddElements();
    return true;
}