说明：  导航电子地图软件,借助于ESRI公司的mapobjects和arcobjects软件,用.NET开发,本代码已经过编译和调试,能正常运行,实现对电子地图的操作.
(electronic map navigation software, using ESRI, the mapobjects and arcobjects software, used.NET development, the code has been compiling and debugging, the normal operation of the electronic maps to achieve the operation.)