NHibernate---用criteria做分页出问题

using CoVics.Framework.DataAccess;
using IWOMTracker.Data.Model;
using System.Collections.Generic;
using NHibernate;
using NHibernate.Criterion;
using System;

namespace IWOMTracker.Data.Dao
{
    public class OutStorageDataDao : AbstractNHibernateDao<OutStorageDataView, int>, IOutStorageDataDao
    {
        #region IOutStorageDataDao 成员

        public IList<OutStorageDataView> GetItemList(int Brand_ID, int pageNo, int pageSize, out int TotalNumber)
        {                       
            IList<OutStorageDataView> List;
            ICriteria critRecordCount = NHibernateSessionReader.CreateCriteria(typeof(OutStorageDataView));
            //查询总数（未入数据）
            TotalNumber = Convert.ToInt32(critRecordCount.SetProjection(Projections.Count("Item_ID")).UniqueResult());
            //获得当前页的数据
            ICriteria crit = NHibernateSessionReader.CreateCriteria(typeof(OutStorageDataView));
            crit.Add(Restrictions.Eq("Brand_ID", Brand_ID));
            crit.SetFirstResult((pageNo - 1) * pageSize)
                            .SetMaxResults(pageSize);
            List = crit.List<OutStorageDataView>();

            return List;
        }

        #endregion
    }
}