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  1. using System;
  2. using System.Collections.Generic;
  3. using System.Linq;
  4.  
  5. public class Test
  6. {
  7.     public string Property1;
  8.     public string Property2;
  9.     public string Property3;
  10.     public string Property4;
  11.     public int Property5;
  12.     public int Property6;
  13.     public int Property7;
  14.     public int Property8;
  15. }
  16.  
  17. public class Program
  18. {
  19. 	public static void Main()
  20. 	{
  21.         List<Test> testList = new List<Test>();
  22.  
  23.         testList.Add(new Test { Property1 = "A", Property2 = "B", Property3 = "C", Property4 = "D", Property5 = 1, Property6 = 2, Property7 = 3, Property8 = 4, });
  24.         testList.Add(new Test { Property1 = "AA", Property2 = "BB", Property3 = "CC", Property4 = "DD", Property5 = 7, Property6 = 8, Property7 = 9, Property8 = 10, });
  25.         testList.Add(new Test { Property1 = "A", Property2 = "B", Property3 = "C", Property4 = "Z", Property5 = 10, Property6 = 20, Property7 = 30, Property8 = 40, });
  26.  
  27.         Console.WriteLine("Input:");
  28.         Print(testList);
  29.  
  30.         // string, string, string = Property1, Property2, Property3
  31.         var dict = new Dictionary<Tuple<string, string, string>, List<Test>>();
  32.  
  33.         foreach (var el in testList)
  34.         {
  35.             List<Test> list;
  36.  
  37.             var key = Tuple.Create(el.Property1, el.Property2, el.Property3);
  38.  
  39.             if (!dict.TryGetValue(key, out list))
  40.             {
  41.                 list = new List<Test>();
  42.                 dict.Add(key, list);
  43.             }
  44.  
  45.             list.Add(el);
  46.         }
  47.  
  48.         var output = new List<Test>(dict.Count);
  49.  
  50.         foreach (var kv in dict)
  51.         {
  52.             var list = kv.Value;
  53.  
  54.             var el = new Test
  55.             {
  56.                 Property1 = kv.Key.Item1,
  57.                 Property2 = kv.Key.Item2,
  58.                 Property3 = kv.Key.Item3,
  59.                 Property4 = list[0].Property4,
  60.             };
  61.  
  62.             output.Add(el);
  63.  
  64.             for (int i = 0; i < list.Count; i++)
  65.             {
  66.                 el.Property5 += list[i].Property5;
  67.                 el.Property6 += list[i].Property6;
  68.                 el.Property7 += list[i].Property7;
  69.                 el.Property8 += list[i].Property8;
  70.             }
  71.         }
  72.  
  73.         Console.WriteLine();
  74.         Console.WriteLine("Output:");
  75.         Print(output);
  76. 	}
  77.  
  78. 	public static void Print(IEnumerable<Test> els)
  79. 	{
  80.         foreach (var el in els)
  81.         {
  82.             Console.WriteLine("{0} {1} {2} {3} {4} {5} {6} {7}", el.Property1, el.Property2, el.Property3, el.Property4, el.Property5, el.Property6, el.Property7, el.Property8);
  83.         }
  84. 	}
  85. }
Success #stdin #stdout 0.01s 131648KB
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stdin
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Standard input is empty
stdout
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Input:
A B C D 1 2 3 4
AA BB CC DD 7 8 9 10
A B C Z 10 20 30 40

Output:
A B C D 11 22 33 44
AA BB CC DD 7 8 9 10
https://ideone.com/pWVDzD
language:
C# (gmcs 5.20.1)
created:
8 years ago
visibility:
public

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