问题：
string shpDir = Path.GetDirectoryName(shpfile);
string shpfilename = Path.GetFileName(shpfile);
IWorkspaceFactory wsFactory = new ShapefileWorkspaceFactoryClass();
IWorkspace ws = wsFactory.OpenFromFile(shpDir, 0);
IFeatureWorkspace featureWorkspace = (IFeatureWorkspace)ws;
IFeatureClass featureClass = featureWorkspace.OpenFeatureClass(shpfilename);
出现异常：
COM Exception 0x80040228
解决方法：
[STAThread]static void Main()
{
IAoInitialize aoInit = new AoInitializeClass();
aoInit.Initialize(esriLicenseProductCode.esriLicenseProductCodeEngine);
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
Application.Run(new formMain());
aoInit.Shutdown();
}pasting