.select() 查询 带有where条件报错 返回

 var roomoutlist = await Db.Queryable<tb_contract_room, tb_room>((cr, r) => new object[] { JoinType.Left, cr.ROOM_ID == r.ROOM_ID })
                .Select((cr,r) => new {Rommid= r.ROOM_ID,Isdell= r.IS_DELETED,IsOpen= r.IS_OPEN,Building= r.BUILDING_ID,Busingess= r.BUSINESS_ID })
                .Where(cr => cr.Isdell == 0 && cr.IsOpen == "on")
                .In(cr=>cr.Busingess, idlist)
                .ToListAsync();

在以上语句查询时候 提示 找不到 cr.isdell 等所有where条件的列 请问这个怎么处理查询。谢谢