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  1. using System;
  2. using System.Linq;
  3. using System.Collections.Generic;
  4.  
  5. public class Test
  6. {
  7.     public class Cls
  8.     {
  9.         public int SequenceNumber { get; set; }
  10.         public int Value { get; set; }
  11.     }
  12.  
  13. 	public static void Main()
  14. 	{
  15. 	    var classes = new List<Cls>() { 
  16.                 new Cls{SequenceNumber=1,Value=9},new Cls{SequenceNumber=2,Value=9}, new Cls{SequenceNumber=3,Value=15},
  17.                 new Cls{SequenceNumber=4,Value=15},new Cls{SequenceNumber=5,Value=15}, new Cls{SequenceNumber=6,Value=30},
  18.                 new Cls{SequenceNumber=7,Value=9}
  19.             };
  20.             var result = classes
  21.                 .GroupAdjacent(c => c.Value)
  22.                 .Select(g => new { 
  23.                     SequenceNumFrom = g.Min(c => c.SequenceNumber),
  24.                     SequenceNumTo = g.Max(c => c.SequenceNumber),  
  25.                     Value = g.Key
  26.                 });
  27.  
  28.             foreach (var x in result)
  29.                 Console.WriteLine("SequenceNumFrom:{0} SequenceNumTo:{1} Value:{2}", x.SequenceNumFrom, x.SequenceNumTo, x.Value);
  30.  
  31. 	}   
  32. }
  33.  
  34.     public class GroupOfAdjacent<TSource, TKey> : IEnumerable<TSource>, IGrouping<TKey, TSource>
  35.     {
  36.         public TKey Key { get; set; }
  37.         private List<TSource> GroupList { get; set; }
  38.         System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator()
  39.         {
  40.             return ((System.Collections.Generic.IEnumerable<TSource>)this).GetEnumerator();
  41.         }
  42.         System.Collections.Generic.IEnumerator<TSource> System.Collections.Generic.IEnumerable<TSource>.GetEnumerator()
  43.         {
  44.             foreach (var s in GroupList)
  45.                 yield return s;
  46.         }
  47.         public GroupOfAdjacent(List<TSource> source, TKey key)
  48.         {
  49.             GroupList = source;
  50.             Key = key;
  51.         }
  52.     }
  53.  
  54.     public static class Extensions
  55.     {
  56.         public static IEnumerable<IGrouping<TKey, TSource>> GroupAdjacent<TSource, TKey>(
  57.             this IEnumerable<TSource> source,
  58.             Func<TSource, TKey> keySelector)
  59.         {
  60.             TKey last = default(TKey);
  61.             bool haveLast = false;
  62.             List<TSource> list = new List<TSource>();
  63.             foreach (TSource s in source)
  64.             {
  65.                 TKey k = keySelector(s);
  66.                 if (haveLast)
  67.                 {
  68.                     if (!k.Equals(last))
  69.                     {
  70.                         yield return new GroupOfAdjacent<TSource, TKey>(list, last);
  71.                         list = new List<TSource>();
  72.                         list.Add(s);
  73.                         last = k;
  74.                     }
  75.                     else
  76.                     {
  77.                         list.Add(s);
  78.                         last = k;
  79.                     }
  80.                 }
  81.                 else
  82.                 {
  83.                     list.Add(s);
  84.                     last = k;
  85.                     haveLast = true;
  86.                 }
  87.             }
  88.             if (haveLast)
  89.                 yield return new GroupOfAdjacent<TSource, TKey>(list, last);
  90.         }
  91.     }
  92.  
Success #stdin #stdout 0.04s 33968KB
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stdin
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Standard input is empty
stdout
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SequenceNumFrom:1 SequenceNumTo:2 Value:9
SequenceNumFrom:3 SequenceNumTo:5 Value:15
SequenceNumFrom:6 SequenceNumTo:6 Value:30
SequenceNumFrom:7 SequenceNumTo:7 Value:9
https://ideone.com/elughG
language:
C# (gmcs 5.20.1)
created:
11 years ago
visibility:
public

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