在看兰小机和刘德儿两位老师编著的ArcObjects GIS应用开发这本书的时候，在做到TextElement标注时运行时并没有显示，但是我的代码和书上都是一样的，不知道是怎么回事，请高手帮助分析一下，谢谢。
代码：
private void btnTextElementLabel_Click(object sender, EventArgs e)
{
IMap pMap;
IFeatureLayer pFeatureLyr;
IFeatureClass pFeatureClass;
string pFieldName = "原村名";
pMap = axMapControl1.Map;
pFeatureLyr = pMap.get_Layer(0) as IFeatureLayer;
pFeatureClass = pFeatureLyr.FeatureClass;
TextElementLabel(pMap, pFeatureClass, pFieldName);
}
private void TextElementLabel(IMap pMap, IFeatureClass pFeatureClass, string strName)
{
//查询条件
//IQueryFilter pQueryFilter = new QueryFilterClass();
//pQueryFilter.WhereClause = "OBJECTID>";
//获取要素查询后的要素有表对象
IFeatureCursor pFeatCursor;
pFeatCursor = pFeatureClass.Search(null,true);//全部地物
IFeature pFeature;
pFeature = pFeatCursor.NextFeature();
while (pFeature != null)
{
IFields pFields = pFeature.Fields;
int i;
//找出标注字段的索引号
i = pFields.FindField(strName);
//得到要素的Envelope
IEnvelope pEnve = pFeature.Extent;
IPoint pPoint = new PointClass();
pPoint.PutCoords(pEnve.XMin + pEnve.Width / 2, pEnve.YMin + pEnve.Height / 2);
//新建字体对象
stdole.IFontDisp pFont;
pFont = new stdole.StdFontClass() as stdole.IFontDisp;
pFont.Name = "arial";
//新建rgb对象
IRgbColor pRGB = new RgbColorClass();
pRGB.Red = 110;
pRGB.Green = 60;
pRGB.Blue = 200;
//产生一个文本符号
ITextSymbol pTextSymbol = new TextSymbolClass();
//设置文本符号的大小
pTextSymbol.Size = 3;
pTextSymbol.Font = pFont;
pTextSymbol.Color = pRGB;
//产生一个文本对象
ITextElement pTextEle = new TextElementClass();