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  1. using static System.Console;
  2. using System.Collections.Generic;
  3.  
  4. public static class Sorteio {
  5.     public static void Main() {
  6.         int[] array = { 1, 2, 3, 4 };
  7.         array.Shuffle();
  8.         foreach (var valor in array) WriteLine(valor);
  9.         WriteLine("Soma: {0}", array[0] + array[2]); // soma 1o. e 3o. elemento
  10.         //vamos de novo
  11.         array.Shuffle(); //com poucos númros tem chance de repetir
  12.         WriteLine($"Soma novo sorteio: {array[0] + array[2]}"); // soma 1o. e 3o. elemento
  13.     }
  14. }
  15.  
  16. namespace System.Collections.Generic {
  17.     public static class IListExt {
  18.         static Random r = new Random(DateTime.Now.Millisecond);
  19.  
  20.         public static void Shuffle<T>(this IList<T> list, int lowerItem, int upperItem) {
  21.             upperItem = upperItem > list.Count ? list.Count : upperItem;
  22.             lowerItem = lowerItem < 0 ? 0 : lowerItem;
  23.             for (int i = lowerItem; i < upperItem; i++) {
  24.                 int j = r.Next(i, upperItem);
  25.                 T tmp = list[j];
  26.                 list[j] = list[i];
  27.                 list[i] = tmp;
  28.             }
  29.         }
  30.  
  31.         public static void Shuffle<T>(this IList<T> list, int upperItem) => list.Shuffle(0, upperItem);
  32.  
  33.         public static void Shuffle<T>(this IList<T> list) => list.Shuffle(0, list.Count);
  34.     }
  35. }
Success #stdin #stdout 0.03s 17740KB
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stdin
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Standard input is empty
stdout
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4
2
1
3
Soma: 5
Soma novo sorteio: 6
https://ideone.com/6uzpYZ
language:
C# (gmcs 5.20.1)
created:
4 years ago
visibility:
public

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