c# - LINQ with SUM for TimeSpan, GROUP 和 JOIN for EF

Question

在我的 EF 模型中：

我提出这样的看法：

使用以下 LINQ 查询（在您的帮助下）：

var query = ctx.data.ToList().OrderBy(d => d.Time).
     GroupBy(d => d.Members.StepId).
     SelectMany(g => g.Select((d, place) => new { Time = d.Time, Members = d.Members, PlaceInStep = place + 1 })).
     GroupBy(d => d.Members.TeamId).
     Select(g => new 
     {
         TeamId = g.Key, 
         Name = g.Select(d => d.Members.Teams.TeamName).First(),  
         Members = g.Select(d => new {Time = d.Time, PlaceInStep = d.PlaceInStep, MemberName = d.Members.MemberName}),                    
         TotalTime = g.Aggregate(new TimeSpan(), (sum, nextData) => sum.Add(nextData.Time))
     });

但我有两个问题：

1. 如果同一步骤中的 2 名成员（例如 35 岁之前）具有相同的时间（最多毫秒），则他们必须具有相同的位置

2. 在结果中的成员子集合中，我想按 StepId 排列成员并显示 StepName。

如何修改此查询？谢谢。

编辑1：

我想拿一些这个：

Answer 1

SQL Query 计算正确的成员位置：

select *, DENSE_RANK() over (partition by StepId order by Time)
from Members m
join Data d on m.MemberId =d.MemberId

linq 等效于现有的 linq 查询：

var query = context.Data.ToList()
    .OrderBy(d=>d.Time)
    .GroupBy(d => d.Members.StepId)
    .SelectMany(g => 
        g.OrderBy(d => d.Time)
        .GroupBy(d => d.Time)
        .SelectMany((x, place) => 
            x.Select(d => new { Time = d.Time, Members = d.Members, PlaceInStep = place + 1 })))
    .GroupBy(d => d.Members.TeamId)
    .Select(g => new
    {
        TeamId = g.Key,
        Name = g.Select(d => d.Members.Teams.TeamName).First(),
        Members = g.Select(d => 
            new 
            { 
                Time = d.Time, 
                PlaceInStep = d.PlaceInStep, 
                MemberName = d.Members.MemberName, 
                StepName = d.Members.Steps.StepName, 
                StepId = d.Members.Steps.StepId 
            }).OrderBy(x=>x.StepId),
        TotalTime = g.Aggregate(new TimeSpan(), (sum, nextData) => sum.Add(nextData.Time))
    });