使用linq中的多个表加入一个列表<object>到sql </object>

Question

我有一个加入列表的问题＆lt;＆gt;在linq to sql表上，

listaFcbm是一个列表是Fcbm和entLogCancelacionAcreditacion的表是复杂对象

var listaFcbm = new Fcbm_Methods().ObtenAcreditacionesEliminadasLog(inicio, fin);

using (FrCEntities db = new FrCEntities())
{
    var lista = (from a in db.FrCs
                 join b in listaFcbm on a.FrCs_Name equals b.Fcbm_Name
                 join c in db.HIS_MOVS on b.Fcbm_Mov_Id equals c.Mov_Id
                 where b.Fcbm_Mov == 1 && a.FrCs_Actv == 1
                 select new entLogCancelacionAcreditacion
                 {
                     No_Socio = a.FrCs_Name,
                     NombreCompleto = a.FrCs_Fst_Name + " " + a.FrCs_Mdl_Name + " " + a.FrCs_Lst_Name,
                     Hotel = c.prop_code,
                     Reservacion = c.rsrv_code,
                     Puntos = b.Fcbm_Points,
                     FechaEntrada = b.Fcbm_Checkin,
                     FechaSalida = b.Fcbm_Checkout,
                     Usuario = b.Fcbm_Add_Usr,
                     TipoAcreditacion = b.Fcbm_Code
                 }).ToList();

    return lista;
}

，错误是

Unable to create a constant value of type ' BLCityPremios.Fcbm ' . Only primitive types or enumeration types are supported in this context .

有什么问题？