 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;
 }
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