如何在N层应用中使用Fluent-NHibernate?

我正在尝试在我的项目中采用Fluent NHibernate,目前我可以从数据库中获取数据,当我在application server时,数据包括它的PK,但是当我将这个数据(作为列表)返回给客户端时,它的PK都是松散的。

我怎样才能解决这个问题?

更新

public class coCity
{
    public virtual string CountryCd { get; private set; }
    public virtual string CityCd { get; private set; }
    public virtual string CityNameTH { get; set; }
    public virtual string CityNameEN { get; set; }
    public virtual int DeliveryLeadTime { get; set; }
    public virtual string CreateBy { get; set; }
    public virtual DateTime CreateDate { get; set; }
    public virtual string UpdateBy { get; set; }
    public virtual DateTime UpdateDate { get; set; }

    public override bool Equals(object obj)
    {
        return this.GetHashCode().Equals(obj.GetHashCode());
    }

    public override int GetHashCode()
    {
        return (this.CountryCd + this.CityCd).GetHashCode();
    }
}

映射类:

public class coCityMap : ClassMap<coCity>
{
    public coCityMap()
    {
        Table("coCity"); // this is optional

        CompositeId()
            .KeyProperty(x => x.CountryCd)
            .KeyProperty(x => x.CityCd);
        Map(x => x.CityNameTH);
        Map(x => x.CityNameEN);
        Map(x => x.DeliveryLeadTime);
        Map(x => x.CreateBy);
        Map(x => x.CreateDate);
        Map(x => x.UpdateBy);
        Map(x => x.UpdateDate);
    }
}

public List<coCity> GetTest()
{
    List<coCity> result = new List<coCity>();

    var sessionFactory = CreateSessionFactory();

    using (var session = sessionFactory.OpenSession())
    {
        result = (List<coCity>)session.CreateCriteria(typeof(coCity)).List<coCity>();
    }

    return result;
}

当它的静态应用程序服务器数据被正确检索时,如下图所示 alt text http://img138.imageshack.us/img138/1071/serverside.png

然而,当这个数据传输回客户端时,它的所有PKs都是松散的,如下所示。 alt text http://img203.imageshack.us/img203/1664/clientside.png