vb.net - SUM 的 LINQ 组

Question

给定以下查询

Dim Query = From c In DB.Crt _
                        Where c.Member.Locked = False _
                        And c.Member.Verified = True _
                        And c.Ct > 0 _
                        Order By c.Ct Ascending _
                        Select New With {.MemberID = c.MemberID, _
                                         .Ct = c.Ct}

我如何按 SUM 分组c.ct？

就像是SUM OF(c.Ct) > 0

Answer 1

试试这个：

Dim Query =
    From c In DB.Crt _
    Where c.Member.Locked = False _
    And c.Member.Verified = True _
    And c.Ct > 0 _
    Order By c.Ct Ascending _
    Group c.Ct By Key = c.MemberID Into Cts = Group _
    Select New With { .MemberID = Key, .Ct = Cts.Sum() }