public void EnableFeatureLayerLabel(IFeatureLayer pFeaturelayer, string sLableField, IRgbColor pRGB, int size, string angleField)
{  //判断图层是否为空  if (pFeaturelayer == null)  return;  IGeoFeatureLayer pGeoFeaturelayer = (IGeoFeatureLayer)pFeaturelayer;  IAnnotateLayerPropertiesCollection pAnnoLayerPropsCollection;  pAnnoLayerPropsCollection = pGeoFeaturelayer.AnnotationProperties;  pAnnoLayerPropsCollection.Clear();  //stdole.IFontDisp  pFont; //字体
    ITextSymbol pTextSymbol;  //pFont.Name = "新宋体";  //pFont.Size = 9;  //未指定字体颜色则默认为黑色  if (pRGB == null)  {  pRGB = new RgbColorClass();  pRGB.Red = 0;  pRGB.Green = 0;  pRGB.Blue = 0;  }  pTextSymbol = new TextSymbolClass();  pTextSymbol.Color = (IColor)pRGB;  pTextSymbol.Size = size; //标注大小
  IBasicOverposterLayerProperties4 pBasicOverposterlayerProps4 = new BasicOverposterLayerPropertiesClass();  switch (pFeaturelayer.FeatureClass.ShapeType)//判断图层类型
    {  case ESRI.ArcGIS.Geometry.esriGeometryType.esriGeometryPolygon:  pBasicOverposterlayerProps4.FeatureType = esriBasicOverposterFeatureType.esriOverposterPolygon;  break;  case ESRI.ArcGIS.Geometry.esriGeometryType.esriGeometryPoint:  pBasicOverposterlayerProps4.FeatureType = esriBasicOverposterFeatureType.esriOverposterPoint;  break;  case ESRI.ArcGIS.Geometry.esriGeometryType.esriGeometryPolyline:  pBasicOverposterlayerProps4.FeatureType = esriBasicOverposterFeatureType.esriOverposterPolyline;  break;  }   pBasicOverposterlayerProps4.PointPlacementMethod = esriOverposterPointPlacementMethod.esriRotationField;  pBasicOverposterlayerProps4.RotationField = angleField;  ILabelEngineLayerProperties pLabelEnginelayerProps = new LabelEngineLayerPropertiesClass();   pLabelEnginelayerProps.Expression = "[" + sLableField + "]";  pLabelEnginelayerProps.Symbol = pTextSymbol;  pLabelEnginelayerProps.BasicOverposterLayerProperties = pBasicOverposterlayerProps4 as IBasicOverposterLayerProperties;  pAnnoLayerPropsCollection.Add((IAnnotateLayerProperties)pLabelEnginelayerProps);  pGeoFeaturelayer.DisplayAnnotation = true;//很重要，必须设置   //axMapControl1.ActiveView.PartialRefresh(esriViewDrawPhase.esriViewBackground, null, null); }
}