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  1. using System;
  2. using System.Linq;
  3.  
  4. public class Test
  5. {
  6. 	public static void Main()
  7. 	{
  8. 		var beatles = (new[]
  9.             {
  10.                 new {id = 1, inst = "guitar", name = "john"},
  11.                 new {id = 2, inst = "guitar", name = "george"},
  12.                 new {id = 3, inst = "guitar", name = "paul"},
  13.                 new {id = 4, inst = "drums", name = "ringo"},
  14.                 new {id = 5, inst = "drums", name = "pete"}
  15.             });
  16.  
  17.             var result = beatles
  18.                 .GroupBy(g => g.inst)
  19.                 .SelectMany(c => c.OrderBy(o => o.id).Select((v, i) => new { i, v }))
  20.                 // .SelectMany(c => c)
  21.                 .Select(c => new { c.v.id, c.v.inst, c.v.name, rn = c.i + 1 })
  22.                 .ToList();
  23.  
  24.             Console.WriteLine("id | inst \t| name  \t| rn");
  25.             foreach (var row in result)
  26.             {
  27.                 Console.WriteLine($"{row.id}  | {row.inst}\t| {row.name}  \t| {row.rn}");
  28.             }     
  29. 	}
  30. }
Success #stdin #stdout 0.05s 28036KB
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stdin
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Standard input is empty
stdout
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id | inst 	| name  	| rn
1  | guitar	| john  	| 1
2  | guitar	| george  	| 2
3  | guitar	| paul  	| 3
4  | drums	| ringo  	| 1
5  | drums	| pete  	| 2
https://ideone.com/76A1AC
language:
C# (gmcs 5.20.1)
created:
1 day ago
visibility:
public

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