问NHibernate会话工厂计数限制？

EN

public interface ISessionFactoryBuilder
{
    IDictionary<string, ISessionFactory> SessionFactories { get; }
}

public IDictionary<string, ISessionFactory> SessionFactories { get; private set; }
    private readonly IConfigurationManager _configurationManager;

    public SessionFactoryBuilder(IConfigurationManager configurationManager)
    {
        this._configurationManager = configurationManager;

        this.SessionFactories = this.BuildSessionFactories();
    }

    private IDictionary<string, ISessionFactory> BuildSessionFactories()
    {
        var sessionFactories = new Dictionary<string, ISessionFactory>(StringComparer.InvariantCultureIgnoreCase);
        var connectionStrings = this._configurationManager.GetConnectionStrings();

        if (connectionStrings.Count == 0)
            throw new ConfigurationErrorsException("No connection descriptions can be found!");

        foreach (ConnectionStringSettings item in connectionStrings)
            if (item.Name != "LocalSqlServer" && item.Name != "OraAspNetConString")
                sessionFactories.Add(item.Name, this.InitializeSessionFactory(item.ConnectionString, item.ProviderName));

        return sessionFactories;
    }

    private class Connectiontypes
    {
        public string Db_type { get; set; }
        public FluentConfiguration Configuration { get; set; }
    }

    private ISessionFactory InitializeSessionFactory(string connectionString = "", string providerName = "")
    {
        Trace.WriteLine($"{connectionString}");

        List<SessionFactoryBuilder.Connectiontypes> conntypes = new List<SessionFactoryBuilder.Connectiontypes> {
            new SessionFactoryBuilder.Connectiontypes
            {
                Db_type = "System.Data.SqlClient",
                Configuration = Fluently.Configure().Database(MsSqlConfiguration.MsSql2005.ConnectionString(connectionString).ShowSql() 
                    .Dialect<XMsSql2005Dialect>()) },
            new SessionFactoryBuilder.Connectiontypes
            {
                Db_type = "System.Data.OracleDataClient",
                Configuration = Fluently.Configure().Database(OracleDataClientConfiguration.Oracle10
                    .ConnectionString(connectionString).Provider<NHibernate.Connection.DriverConnectionProvider>()
                    .Driver<NHibernate.Driver.OracleManagedDataClientDriver>()
                    .Dialect<XOracle10gDialect>().ShowSql())
            },
            new SessionFactoryBuilder.Connectiontypes
            {
                Db_type = "System.Data.MySQLDataClient", Configuration = Fluently.Configure()
                    .Database(MySQLConfiguration.Standard.ConnectionString(connectionString).ShowSql())
            }
        };

        FluentConfiguration fluentConfiguration = conntypes.Find(x => x.Db_type == providerName).Configuration;

        fluentConfiguration.ExposeConfiguration(x =>
        {
            x.SetProperty("command_timeout", "120");
        });

#if DEBUG
        fluentConfiguration.ExposeConfiguration(x =>
        {
            x.SetInterceptor(new SqlStatementInterceptor());
        });
#endif

        var mappings = fluentConfiguration.Mappings(m =>
        {
            m.FluentMappings.AddFromAssemblyOf<UsersMap>();
        });

        var config = mappings.BuildConfiguration();

        foreach (PersistentClass persistentClass in config.ClassMappings)
        {
            persistentClass.DynamicUpdate = true;
        }

        var sessionFactory = mappings
#if DEBUG
            .Diagnostics(d => d.Enable(true))
            .Diagnostics(d => d.OutputToConsole())
#endif
            .BuildSessionFactory();

        return sessionFactory;
    }

    public void Dispose()
    {
        if (this.SessionFactories.Count > 0)
        {
            foreach (var item in this.SessionFactories)
            {

                item.Value.Close();
                item.Value.Dispose();
            }

            this.SessionFactories = null;
        }
    }
}

Bind<ISessionFactoryBuilder>().To<SessionFactoryBuilder>().InSingletonScope().WithConstructorArgument("configurationManager", context => context.Kernel.Get<IConfigurationManager>());