（1）不同于传统方式注册发布图层获取图层，改成直接连接空间数据库Oracle/PostGIS，获取图层
//传统获取ArcServer发布的图层方法
IMapServer3 mapServer = (IMapServer3)serverObjectHelper.ServerObject;//注册图层获取要素层
IMapServerDataAccess dataAccess = (IMapServerDataAccess)mapServer;
IFeatureClass pfeatureclass = (IFeatureClass)dataAccess.GetDataSource(mapServer.DefaultMapName, 0);
GlobelHandler.workSpace = (pfeatureclass as IDataset).Workspace;
System.Runtime.InteropServices