Question

我正在尝试构建linq到实体查询。这就是我到目前为止所做的：

            from x in db.BusSchedule
            join y in db.BusSchedule on x.ID equals y.ID - 1
            where Convert.ToInt32(y.StopOrder) >= Convert.ToInt32(x.StopOrder) 
            && x.NameOfTown == arrival
            && x.Line in (SELECT Line FROM BusSchedule WHERE NameOfTown = destination) 
            orderby x.DepartureTime ascending
            select x).Distinct()

我不知道如何做IN部分，我正在粘贴我正在使用的实际sql查询。我该如何翻译那个sql查询

'SELECT Line FROM BusSchedule WHERE NameOfTown = destination'

在Linq to Entities查询中？

提前致谢，Laziale

Answer 1

var dest = (from b in db.BusSchedule
           where b.NameOfTown = destination
           select b.Line).ToList();

var output = (from x in db.BusSchedule.Where(b => b.NameOfTown == arrival)
             join y in db.BusSchedule on x.ID equals y.ID - 1
             where Convert.ToInt32(y.StopOrder) >= Convert.ToInt32(x.StopOrder) 
                   && dest.Contains(x.Line)
             orderby x.DepartureTime ascending
             select x)
             .Distinct()

linq to entities查询哪个有多个where子句，哪个where子句有where where condition

1 个答案: