ArcEngine 图层标注 （根据字段、角度）

转自chanyinhelv原文 ArcEngine 图层标注 （根据字段、角度）

今天做了一个用AE来控制图层是否显示标注，以及已哪一个字段作为标注的字段，以哪一个字段作为标注的角度，现将代码写下来，以备以后差用。

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 = ;
        pRGB.Green = ;
        pRGB.Blue = ;
    }  

    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); }
}