我可以将Linq的结果合并到SQL查询中吗？

Question

我可以将我的Linq整合到Sql查询结果作为查询的一部分吗？例如，以下查询将返回下面的列表A.我希望我的列表合并如下面的列表B.

        IEnumerable<JoinClass> points =
                         from c in db.Users2
                         join e in db.Categories on c.Id_Users2 equals e.FK_Users2
                         join f in db.Programs on e.Id_Category equals f.FK_Categories
                         join g in db.Points on f.Id_Programs equals g.FK_Programs
                         where c.EEID == UserEEIDCast
                         orderby g.EntryDate ascending
                         select new JoinClass
                         {
                             Category = e.Category,
                             Programs = f.Programs,
                             Points = g.Points,
                             EEID = c.EEID,
                             EntryDate = g.EntryDate,
                             Name = c.Name



        return View(points);

列出A

名称计划点

---

Jim Running 10

Jim Running 3

Jim Walking 7

Jim Walking 4

Bob Running 2 Bob Running 1

列表B

名称计划点

---

Jim Running 13

Jim Walking 11

Bob Running 3

Answer 1

尝试：

points = points
    .GroupBy(x => new { x.Name, x.Program } )
    .Select(x => new JoinClass() {Name = x.Key.Name, Program = x.Key.Program, Points = x.Sum(y => y.Points) /* copy other properties to the new JoinClass here */ });

此代码使用复合键（名称和程序）对结果进行分组，然后为每个组创建一个新的JoinClass，其Points等于该组中所有点的总和。