如何在entity framework中对列进行求和

我试图总结一个列，并明智地获取详细信息

我的表数据是

id membername cost 1 a 100 2 aa 100 3 a 100 4 aa 0 5 b 100 

---

在entity framework中，我尝试对成本列求和并得到这样的结果

 membername totalcost a 200 aa 100 b 100 

然后我这样做

 var result = from o in db.pruchasemasters.Where(d => d.memberid == d.membertable.id && d.entrydate >= thisMonthStart && d.entrydate  s.price) }; 

如何阅读结果并且我的代码是否合适？

Answer 1

这样的东西会起作用

  var result = db.pruchasemasters.GroupBy(o => o.membername) .Select(g => new { membername = g.Key, total = g.Sum(i => i.cost) }); foreach (var group in result) { Console.WriteLine("Membername = {0} Totalcost={1}", group.membername, group.total); }