说明：  <Arcgis开发集锦>在别的网站上转载过来的，C#+A0里面描述的比较详细，有大量源代码可供参考，是AO开发不错的资料！
(<Arcgis开发集锦> Reproduced in other websites over the, C#+ A0 which is described in more detail, there are a lot of source code available for reference, is AO developing good information!)