说明：  ArcObjects(简称AO)是美国ESRI ( Environmental Systems Research Institute,Inc,)公司提供的一个GIS技术框架，它是基于Microsoft的COM技术开发的一套COM组件对象集，这个组件集提供了几乎全部的底层GIS功能
(ArcObjects (abbreviated AO) is a GIS technology framework U.S. ESRI (Environmental Systems Research Institute, Inc,) company, which is based on a set of COM Component Object Microsoft s COM technology development, this component set provides almost all of the underlying GIS functions)