AE实现Label Feature（转）

主要运用IAnnotateLayerPropertiesCollection ，IAnnotateLayerProperties， ILineLabelPosition，ILineLabelPlacementPriorities ，IBasicOverposterLayerProperties，ILabelEngineLayerProperties等接口。

 private void  AddlableTolayer(IGeoFeatureLayer  pGeoFeatureLayer, string fieldname)
        {
            IFeatureClass pFeatureClass;
            pFeatureClass = pGeoFeatureLayer.FeatureClass;

            //矢量图层标注信息设置
            IAnnotateLayerPropertiesCollection pAnnotateLayerPropertiesCollection;
            pAnnotateLayerPropertiesCollection = pGeoFeatureLayer.AnnotationProperties;
            pAnnotateLayerPropertiesCollection.Clear();

            //定义一个矢量图层动态标注显示
            IAnnotateLayerProperties pAnnotateLayerProperties;
            //定义控制线标注的相对位置
            ILineLabelPosition pLineLabelPosition;
            //控制线标注的属性设置
            ILineLabelPlacementPriorities pLineLabelPlacementPriorities;
            IBasicOverposterLayerProperties pBasicOverposterLayerProperties;
            ILabelEngineLayerProperties pLabelEngineLayerProperties;

            pLineLabelPosition = new LineLabelPositionClass();
            pLineLabelPosition.Parallel = false;
            pLineLabelPosition.Perpendicular = true;

            pLineLabelPlacementPriorities = new LineLabelPlacementPrioritiesClass();
            pBasicOverposterLayerProperties = new BasicOverposterLayerPropertiesClass();
            pBasicOverposterLayerProperties.FeatureType = esriBasicOverposterFeatureType.esriOverposterPolyline;
            pBasicOverposterLayerProperties.LineLabelPlacementPriorities = pLineLabelPlacementPriorities;
            pBasicOverposterLayerProperties.LineLabelPosition = pLineLabelPosition;

            pLabelEngineLayerProperties = new LabelEngineLayerPropertiesClass();
            pLabelEngineLayerProperties.BasicOverposterLayerProperties = pBasicOverposterLayerProperties;

            pLabelEngineLayerProperties.Expression = "["+fieldname +"]";
            pAnnotateLayerProperties = pLabelEngineLayerProperties as IAnnotateLayerProperties;

            pAnnotateLayerPropertiesCollection.Add(pAnnotateLayerProperties);
          

        }

        private void labelfeature_Click(object sender, EventArgs e)
        {
               IGeoFeatureLayer geolayer=TOCRightLayer as IGeoFeatureLayer;//将TOCRightLayer 赋值，从MapControl中获取的图层
              geolayer.DisplayAnnotation = labelfeature.Checked;
              AddlableTolayer(geolayer, "乡名称");   //关于要标注的属性字段可以弹出一个窗体来选择。
              mainMapControl.Refresh();
            
        }

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