按转换分组

Question

如何将以下SQL查询转换为lambda表达式？

select MAX(ID),ProcessInstanceID from tblKGWorks 
where FormID = 2598 and FormTypeID =2306
group by ProcessInstanceID

Answer 1

试一试：

var qry = tblKGWorks
          .Where(gk=>gk.FormID == 2598 && gk.FormTypeID == 2306)
          .GroupBy(x=>x.ProcessInstanceID)
          .Select(grp=>new{ID = grp.Max(a=>a.ID), ProcessInstanceID = grp.Key});

更多信息：101 Linq Samples