关键代码 IPropertySet pPropertySet = new PropertySetClass();            pPropertySet.SetProperty("SERVER", sde.IpAdress);      pPropertySet.SetProperty("INSTANCE", "sde:oracle11g$//" + sde.IpAdress + "/" + sde.Instance); pPropertySet.SetProperty("USER", sde.User); pPropertySet.SetProperty("PASSWORD", sde.Password); pPropertySet.SetProperty("AUTHENTICATION_MODE", "DBMS"); pPropertySet.SetProperty("VERSION", "SDE.DEFAULT"); 标粗出的代码为关键代码