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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<Fact> () {
  10.                             new Fact { Thing = "Roses are", Color = 0xFF0000 },
  11.                                     new Fact { Thing = "Roses are", Color = 0xFF0000 },
  12.                                     new Fact { Thing = "Violets are", Color = 0x0000FF },
  13.                                     new Fact { Thing = "Sugar is", Color = 0x1337 },
  14.                                     new Fact { Thing = "Sugar is", Color = 0x1337 },
  15.                             };
  16.  
  17.                 foreach (var item in GetFacts(list)) {
  18.                     Console.WriteLine ("{0:x} {1:x}", item.Thing, item.Color);
  19.                 }
  20.         }
  21.  
  22.         public static IEnumerable<Fact> GetFacts(IEnumerable<Fact> list) {
  23.             return list.Distinct();
  24.         }
  25.  
  26. }
  27.  
  28.  
  29. public class Fact
  30. {
  31.     public string Thing { get; set; }
  32.     public int Color { get; set; }
  33.  
  34.     public override bool Equals (object obj)
  35.     {
  36.         if (obj == null) return false;
  37.  
  38.         var x = obj as Fact;
  39.         if (x == null) return  false;
  40.  
  41.         return this.Thing == x.Thing && this.Color == x.Color;
  42.     }
  43.  
  44.  
  45.     public override int GetHashCode ()
  46.     {        
  47.         // http://stackoverflow.com/questions/263400/what-is-the-best-algorithm-for-an-overridden-system-object-gethashcode
  48.         unchecked 
  49.         {
  50.             int hash = 17;
  51.             hash = hash * 23 + this.Thing.GetHashCode ();
  52.             hash = hash * 23 + this.Color.GetHashCode ();
  53.  
  54.             return hash;
  55.         }
  56.     }      
  57. }
Success #stdin #stdout 0.04s 34064KB
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stdin
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Standard input is empty
stdout
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Roses are ff0000
Violets are ff
Sugar is 1337
https://ideone.com/eMrO4y
language:
C# (gmcs 5.20.1)
created:
11 years ago
visibility:
public

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