Castle ActiveRecord 获取nh的ISession

ISessionFactoryHolder holder = ActiveRecordMediator.GetSessionFactoryHolder();
ISessionScope activeScope = holder.ThreadScopeInfo.GetRegisteredScope();
ISession session = null;
var key = holder.GetSessionFactory(typeof(ActiveRecordBase));
if (activeScope == null)
{
session = holder.CreateSession(typeof(ActiveRecordBase));
}
else
{
if (activeScope.IsKeyKnown(key))
session = activeScope.GetSession(key);
else
session = holder.GetSessionFactory(typeof(ActiveRecordBase)).OpenSession();
}