ArcGIS Engine基于C#的二次开发，地理信息系统开发教程中的源码，实现空间查询统计功能-Based on the secondary development of ArcGIS Engine C#, geographical information system development tutorial source, spatial query statistics

主要实现全国铁路系统的查询，基本的地图操作，比如鹰眼，属性查询，空间查询，渲染，统计等等(Mainly to achieve the national railway system query, basic map operations, such as Hawk Eye, attribute query, spatial query, rendering, statistics and so on.)