打开shpfile，mdb，sde工作空间

打开shapefile工作空间：

 ESRI.ArcGIS.Geodatabase.IWorkspaceFactory wsf = new ESRI.ArcGIS.DataSourcesFile.ShapefileWorkspaceFactory();

 IWorkspace ws = wsf.OpenFromFile(Application.StartupPath, );

 IFeatureClass f1 = (ws as IFeatureWorkspace).OpenFeatureClass("floodarea1");

打开mdb工作空间：

 IWorkspaceFactory wsf = new ESRI.ArcGIS.DataSourcesGDB.AccessWorkspaceFactory();

 IWorkspace ws = wsf.OpenFromFile(Application.StartupPath+@"\test.mdb", );

 IFeatureClass f1 = (ws as IFeatureWorkspace).OpenFeatureClass("floodarea1");

用IWorkspaceName打开mdb工作空间：

 IPropertySet pPropSet = new PropertySetClass();
                 pPropSet.SetProperty("DATABASE", strMdb);
                 IWorkspaceName pInWsName = new WorkspaceNameClass();
                 pInWsName.WorkspaceFactoryProgID = "esriDataSourcesGDB.AccessWorkspaceFactory";
                 pInWsName.ConnectionProperties = pPropSet;

                 IWorkspaceFactory pFact = new AccessWorkspaceFactoryClass();
                 IWorkspace pWorkspace = pFact.Open(pPropSet, );

打开存储在oracle中的sde工作空间：

 IWorkspace ws = null;
 IPropertySet pPropSet = new PropertySetClass();
 IWorkspaceFactory pSdeFact = new SdeWorkspaceFactoryClass();

 string Server = "192.168.1.91";
 string Instance = "";//"esri_sde";
 string Database = "oracle";
 string User = "sde";
 string Password = "sde";
 string version = "SDE.DEFAULT";

 pPropSet.SetProperty("SERVER", Server);
 pPropSet.SetProperty("INSTANCE", Instance);
 pPropSet.SetProperty("DATABASE", Database);
 pPropSet.SetProperty("USER", User);
 pPropSet.SetProperty("PASSWORD", Password);
 pPropSet.SetProperty("VERSION", version);
 ws = pSdeFact.Open(pPropSet, );

 IFeatureClass f1 = (ws as IFeatureWorkspace).OpenFeatureClass("floodarea1");