arcgis 如何圖層中選中的要素

 private List<IFeature> getSelectFeatures(IFeatureLayer featureLayer)
        {
            List<IFeature> list=new List<IFeature>();
           IFeatureSelection pFeatureSelection=featureLayer as IFeatureSelection;
           ISelectionSet pSelectionSet = pFeatureSelection.SelectionSet;
           IEnumIDs enumIDs = pSelectionSet.IDs;
           int id = enumIDs.Next();
           while (id!=-1)
           {
               IFeature pFeature = featureLayer.FeatureClass.GetFeature(id);
               list.Add(pFeature);
               id = enumIDs.Next();
           }