linq 加orderby后报错

今天下午做一高效分页，

var spdmList = from d in data
select d.spdm;

var resdata = from z in db.z_tz

where spdmList.Contains(z.spdm)
select z;

在resdata中加一个orderby 便会报错如：

var resdata = from z in db.z_tz
orderby z.id
where spdmList.Contains(z.spdm)
select z

报错详细为：Unknown column 'Extent1.spdm' in 'where clause'

只能tolist后再orderby

问题解决：

var spdmList = from d in data
select d.spdm;

var resdata = from z in db.z_tz

where spdmList.Contains(z.spdm)
select z;

改为

var spdmList = (from d in data
select d.spdm).ToList() ;

var resdata = from z in db.z_tz
orderby z.id
where spdmList.Contains(z.spdm)
select z ;

先spdmList 变为内存数据就OK