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  1. using System;
  2. using System.Linq;
  3.  
  4. class Foo
  5. {
  6.   public int A { get; set; }
  7.   public int B { get; set; }
  8. }
  9.  
  10. public class Test
  11. {
  12. 	public static void Main()
  13. 	{
  14.            var list = new System.Collections.Generic.List<Foo>(){
  15.                 new Foo(){ A = 1, B = 1 },
  16.                 new Foo(){ A = 1, B = 2 },
  17.                 new Foo(){ A = 2, B = 3 },
  18.                 new Foo(){ A = 2, B = 4 },
  19.                 new Foo(){ A = 1, B = 5 },
  20.                 new Foo(){ A = 3, B = 6 }
  21.             };
  22.  
  23.             var groups = list
  24.     		.Select((f, i) => new
  25.     		{
  26.         		Obj = f,
  27.         		Next = list.ElementAtOrDefault(i + 1),
  28.         		Prev = list.ElementAtOrDefault(i - 1)
  29.     		})
  30.     		.Select(x => new
  31.     		{
  32.         		A = x.Obj.A,
  33.         		x.Obj,
  34.         		Consecutive = (x.Next != null && x.Next.A == x.Obj.A)
  35.                    		   || (x.Prev != null && x.Prev.A == x.Obj.A)
  36.     		})
  37.     		.GroupBy(x => new { x.Consecutive, x.A });
  38.  
  39.             foreach (var abGroup in groups)
  40.             {
  41.                 int aKey = abGroup.Key.A;
  42.                 var bList = string.Join(",", abGroup.Select(x => x.Obj.B.ToString()).ToArray());
  43.                 Console.WriteLine("A = {0}, Bs = [ {1} ] ", aKey, bList);
  44.             }
  45. 	}
  46. }
Success #stdin #stdout 0.05s 37320KB
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stdin
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Standard input is empty
stdout
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A = 1, Bs = [ 1,2 ] 
A = 2, Bs = [ 3,4 ] 
A = 1, Bs = [ 5 ] 
A = 3, Bs = [ 6 ]
https://ideone.com/fXgQ3
language:
C# (gmcs 5.20.1)
created:
13 years ago
visibility:
public

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