C# lambda expression for getting the group by and count - linq

Question

I have C# data and want to use Normal data looks like below
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
So I want out put of the list like below and the message Type other may contains empty space or null values.
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
I want to use Linq or Lambda expression for the this.
I have use like this but do not know how put the count column.
listEOMRep = listEOMRep.OrderBy(x => x.client).ThenBy(x => x.MessageType).ToList();

Answer 1

This is not excactly as you want it, but it gets the job done I guess:
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; }
}
Output: