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, 0);

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+@"	est.mdb", 0);

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, 0);

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 = "5151";//"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, 0);

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