在LINQ中选择一个奇怪的值@ p__linq__0

Question

我在LINQ中有这个选择

 public List<EquipamentoNoDiscovery> GetEquipamentosNoDiscovery(int imID)

var lista = (from ma in ctx.macaddress
                         join m in ctx.mac on
                       ma.address_mac equals m.mac_id into g1
                         from m in g1.DefaultIfEmpty()

                         join ml in ctx.mac_link on
                         m.mac_id equals ml.mac_id into g2
                         from ml in g2.DefaultIfEmpty()

                         join im in ctx.immobile on
                         ml.link_id equals im.immobile_id into g3
                         from im in g3.DefaultIfEmpty()

                         join en in ctx.enterprise on
                          im.enterprise_id equals en.enterprise_id into g4
                         from en in g4.DefaultIfEmpty()

                         join pl in ctx.port_link on
                        ma.address_id equals pl.address_id into g5
                         from pl in g5.DefaultIfEmpty()

                         join p in ctx.port on
                         new { pl.sw_id, pl.port_id } equals new { p.sw_id, p.port_id }

                         join s in ctx.switch_lan on
                        pl.sw_id equals s.sw_id into g6
                         from s in g6.DefaultIfEmpty()
                         where pl.address_id == imID
                         select new
                         {
                             Regiao = en.enterprise_u_name,
                             Predio = im.immobile_u_name,
                             Equipamento = m.host,
                             TipoPlaca = m.mac_type,
                             Mac = ma.address_mac,
                             Ip_ma = ma.address_ip,
                             Ip_m = m.ip_address,
                             Comunidade = s.sw_community,
                             IpSwitch = s.sw_ip,
                             PortaIndex = p.port_index,
                             PortaNome = p.port_name
                         });

            ObjectQuery oQuery = (ObjectQuery)lista;
            string cmdSQL = oQuery.ToTraceString();

当我使用命令oQuery.ToTraceString（）时，我可以看到“其中pl.address_id == imID”成为“WHERE [Extent6]。[address_id] = @p_ linq _0 ”。 然后我的select总是返回空，如果在SQL命令中我将值@p_ linq _0更改为数字，它工作正常。 有什么建议吗？ 谢谢！

Answer 1

这只是一个查询参数，来自此where claused。

where pl.address_id == imID

您的日志还应显示已为该参数传递的值，该值应为imID的值。检查这个值 - 它可能不是你想象的那样。