C# linq到sql中的sum和group by

我有一个linq，它返回如下所示的值

我尝试了下面的代码来为团队计算关联分数

我想得到员工积分和团队id的总和

var result = from p in orderForBooks
group p by p.iTeamId into g
select new
{
    points = g.Sum(x => x.Associate_Points),
    teamid=g.Select(x=>x.iTeamId)
};

---

它对关联点求和，但不获取团队id

因为您是按

iTeamId

分组的，您只需从组的

键

中获取每组的

iTeamId

：

var result   = orderForBooks
.GroupBy(t => t.iTeamId )
.Select(tm => new ResultObj
        {
            teamid= tm.Key,
            points = tm.Sum(c => c.Associate_Points)
        }).ToList();

var result = from p in orderForBooks
group p by p.iTeamId into g
select new
{
    points = g.Sum(x => x.Associate_Points),
    teamid = g.Key
};