CAD鼠标移动到对象时显示对象内容

//定义事件
        Editor ed = doc.Editor;
        ed.PointMonitor += new PointMonitorEventHandler(ed_PointMonitor);

        //事件执行函数
        void ed_PointMonitor(object sender, PointMonitorEventArgs e)
        {
            //拾取当前实体对象提交
            FullSubentityPath[] fsp = e.Context .GetPickedEntities();
             if (fsp.Length > 0)
            {
                // 显示实体ID
                // doc.Editor.WriteMessage(fsp[0].GetObjectIds()[0].ToString());

                 e.AppendTollTipText(fsp[0].GetobjectIds()[0].ToString());
             }
         }