获取当前图层选择的feature

            IFeatureLayer pFeatureLayer;
            IFeatureSelection pFeatSel;
            ISelectionSet pSelectionSet;
            pFeatureLayer = pCurrentLayer as IFeatureLayer;
            pFeatSel = (IFeatureSelection)pCurrentLayer;
            pSelectionSet = pFeatSel.SelectionSet;
            int lID;
            IEnumIDs pEnumIDs;
            pEnumIDs = pSelectionSet.IDs;
            IFeature pFirstSelctedFeature;
            IFeature pSetFeature;
            IGeometry polygon;
            lID = pEnumIDs.Next();
            if (lID != -1)
            {
                pFirstSelctedFeature = pFeatureLayer.FeatureClass.GetFeature(lID);
             }
其中 pCurrentLayer 为当前图层