C＃lambda表达式用于获取组和计数

Question

我有C＃数据，想要使用正常数据，如下所示

ID           Count   Client      MessageType
1   100 MegaTech    Missing SO
2   100 MegaTech    Not shipped
3   100 NIXIMIXI     No PDF
4   100 MegaTech    Missing SO
5   100 NIXIMIXI     Not shipped
6   100 MegaTech    No PDF
7   100 NIXIMIXI    Other
8   100 MegaTech    Other
9   100 MegaTech    No PDF
10  100 NIXIMIXI    Missing SO
11  100 MegaTech    Not shipped
12  100 NIXIMIXI    No PDF
13  100 MegaTech    Missing SO
14  100 NIXIMIXI    Not shipped
15  100 NIXIMIXI    No PDF
16  100 MegaTech    other
17  100 NIXIMIXI    other
18  100 NIXIMIXI    other

所以我想要像下面这样放置列表，消息Type other可能包含空格或空值。

ID       Count   Client      MessageType
1   100 MegaTech    Missing SO
2   100 MegaTech    Missing SO
3   100 MegaTech    No PDF
4   100 MegaTech    No PDF
5   100 MegaTech    No PDF
6   100 MegaTech    Not shipped
7   100 MegaTech    Not shipped
8   100 MegaTech    Other
9   100 MegaTech    Other
10  Total For   9      Total Items    900
11  100 NIXIMIXI    Missing SO
12  100 NIXIMIXI    Missing SO
13  100 NIXIMIXI    No PDF
14  100 NIXIMIXI    No PDF
15  100 NIXIMIXI    Not shipped
16  100 NIXIMIXI    Not shipped
17  100 NIXIMIXI    other
18  100 NIXIMIXI    other
19  100 NIXIMIXI    other

20  Total For   9      Total Items  900

我想使用Linq或Lambda表达式。 我这样使用但不知道如何把计数列。

 listEOMRep = listEOMRep.OrderBy(x => x.client).ThenBy(x => x.MessageType).ToList();

Answer 1

这不完全符合您的要求，但我认为它完成了工作：

void Main()
{
    var source = new List<CustomObject>() 
    {
        new CustomObject() {Id = 1, Count = 100, Client = "MegaTech", MessageType = "Not Shipped" },
        new CustomObject() {Id = 2, Count = 250, Client = "NIXIMIXI", MessageType = "Not Shipped" },
        new CustomObject() {Id = 3, Count = 45, Client = "NIXIMIXI", MessageType = "No PDF" },
        new CustomObject() {Id = 4, Count = 10, Client = "MegaTech", MessageType = "Not Shipped" },
        new CustomObject() {Id = 5, Count = 100, Client = "MegaTech", MessageType = "No PDF" },
        new CustomObject() {Id = 6, Count = 100, Client = "NIXIMIXI", MessageType = "Not Shipped" },
        new CustomObject() {Id = 7, Count = 100, Client = "NIXIMIXI", MessageType = "Not Shipped" },
        new CustomObject() {Id = 8, Count = 140, Client = "MegaTech", MessageType = "other" }
    };

    var result = source.OrderBy(x => x.Client)
                       .ThenBy (x => x.MessageType)
                       .GroupBy (s => s.Client)
                       .Select (s => new {
                            Key = s.Key,
                            Object = s,
                            TotalFor = s.Count(),
                            TotalItems = s.Sum(x => x.Count)
                       })
                       .Dump();
}

public class CustomObject
{
    public int Id { get; set; }
    public int Count { get; set; }
    public string Client { get; set; }
    public string MessageType { get; set; }
}

输出：