获取指定图层被选中的要素arcgis

 public IFeature getSelLayerFeature(int nIndexLayer)
        {
            IFeature fea = null;

            IFeatureLayer pFeaLayer;
            pFeaLayer = this.m_axMapControl.Map.get_Layer(nIndexLayer) as IFeatureLayer;
            IFeatureSelection pFeatSel = (IFeatureSelection)pFeaLayer;
            ISelectionSet pSelectionSet = pFeatSel.SelectionSet;
            if (pSelectionSet.Count == 0)
            {
            
                Console.WriteLine("在 '" + pFeaLayer.Name + "' 图层没有要素被选中！");
                return null;
            }
            int id = -1;
            IEnumIDs ids = pSelectionSet.IDs;
            id = ids.Next();
            //    Console.WriteLine(id.ToString());
            if(id!=-1)
            {
                fea = pFeaLayer.FeatureClass.GetFeature(id);
            }

         
            return fea;
        }

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