public static NHibernateWebSessionFactory GetInstancia(ISessionFactory sessionFactory)
 {
     if (_instance != null)
     {
         throw new InvalidOperationException("ErrosEstrutura.CriacaoNHSessionFactory");
     }
     _instance = new NHibernateWebSessionFactory(sessionFactory);
     return(_instance);
 }
 /// <summary>
 /// Instância do objeto singleton
 /// </summary>
 public static NHibernateWebSessionFactory GetInstancia()
 {
     return(_instance ?? (_instance = new NHibernateWebSessionFactory()));
 }