C# Linq Groupby Sum嵌套可观察集合

我需要一些帮助来收集我收集的数据

RrvResponse类

/// <summary>
    /// The RRV response.
    /// </summary>
    public class RrvResponse
    {
        /// <summary>
        /// Initializes a new instance of the <see cref="RrvResponse"/> class.
        /// </summary>
        public RrvResponse()
        {
            this.BoDPoints = new ObservableCollection<BidOfferPoint>();    
        }

        /// <summary>
        /// Gets or sets the id.
        /// </summary>
        public string Id { get; set; }

        /// <summary>
        /// Gets or sets the message date.
        /// </summary>
        public DateTime MessageDate { get; set; }

        /// <summary>
        /// Gets or sets the BOD points.
        /// </summary>
        public ObservableCollection<BidOfferPoint> BoDPoints { get; set; }
    }

可观测收集Bod-2

2013-06-21 
00:00
Observable Collection Bod - 1
2013-06-21 
00:00
100
10

2013-06-21
00:15
120
15

2013-06-21
00:30
150
9
40
1

2013-06-21
00:15
10
0.5

2013-06-21
00:30
11
0.1

可观测收集Bod-3

2013-06-15 
00:00
100
10

2013-06-15
00:15
120
15

2013-06-15
00:30
150
9

我希望按日期分组，然后按时间分组，并汇总卷。因此，在上述示例中，应对2013年6月21日00:00时的所有卷进行聚合，应对2013年6月21日00:15时的所有卷进行聚合

---

使用Linq实现这一点的最佳方法是什么

您可以使用

SelectMany

对项目进行聚合，然后对项目进行分组：

var result = responses
    .SelectMany(r => r.BoDPoints)
    .GroupBy(p => p.Date)
    .Select(byDate => 
        new 
        {
            Date = byDate.Key,
            EntriesByTime = byDate
                .GroupBy(p => p.Time)
                .Select(byTime => 
                    new 
                    {
                        Time = byTime.Key,
                        TotalVolume = byTime.Sum(p => p.Volume)
                    })
        });

您可以使用以下循环（例如，输出总体积）

---

如何获得卷的总和？

2013-06-21 
00:00
Observable Collection Bod - 1
2013-06-21 
00:00
100
10

2013-06-21
00:15
120
15

2013-06-21
00:30
150
9
40
1

2013-06-21
00:15
10
0.5

2013-06-21
00:30
11
0.1

2013-06-15 
00:00
100
10

2013-06-15
00:15
120
15

2013-06-15
00:30
150
9

var result = responses
    .SelectMany(r => r.BoDPoints)
    .GroupBy(p => p.Date)
    .Select(byDate => 
        new 
        {
            Date = byDate.Key,
            EntriesByTime = byDate
                .GroupBy(p => p.Time)
                .Select(byTime => 
                    new 
                    {
                        Time = byTime.Key,
                        TotalVolume = byTime.Sum(p => p.Volume)
                    })
        });

foreach (var byDate in result)
{
    Console.WriteLine("Entries for date " + byDate.Date);
    foreach (var byTime in byDate.EntriesByTime)
    {
        Console.WriteLine("Total volume for time " + byTime.Time + ": " + byTime.TotalVolume);
    }
}