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  1. using System;
  2. using System.Linq;
  3. using System.Collections.Generic;
  4.  
  5. public class Test
  6. {
  7. 	public static void Main()
  8. 	{
  9. 		var list = new List<Test>
  10. 		{
  11. 			new Test { A = 1, B = 1, C = 1, GroupName = "A" },
  12. 			new Test { A = 1, B = 1, C = 1, GroupName = "A" },
  13.  
  14. 			new Test { A = 2, B = 2, C = 2, GroupName = "B" },
  15. 			new Test { A = 2, B = 2, C = 2, GroupName = "B" },
  16.  
  17. 			new Test { A = 3, B = 3, C = 3, GroupName = "C" },	
  18. 			new Test { A = 3, B = 3, C = 3, GroupName = "C" },	
  19. 		};
  20. 		var newList = list.GroupBy(g => g.GroupName).Select(e => new
  21. 		{
  22. 			A_Count = e.Sum(a => a.A),
  23. 			B_Count = e.Sum(b => b.B),
  24. 			C_Count = e.Sum(c => c.C),
  25. 			GroupName = e.Key
  26. 		});
  27.  
  28. 		foreach (var e in newList)
  29. 		{
  30. 			Console.WriteLine("groupName: {0}, A sum: {1}", e.GroupName, e.A_Count);
  31. 		}
  32. 	}
  33.  
  34. 	public int A { get; set; }
  35. 	public int B { get; set; }
  36. 	public int C { get; set; }
  37. 	public string GroupName { get; set; }
  38. }
Success #stdin #stdout 0.02s 132544KB
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stdin
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Standard input is empty
stdout
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groupName: A, A sum: 2
groupName: B, A sum: 4
groupName: C, A sum: 6
https://ideone.com/G6hlnv
language:
C# (gmcs 5.20.1)
created:
4 years ago
visibility:
public

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