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  1. using System;
  2. using System.Collections.Generic;
  3. using System.Linq;
  4. using System.Text;
  5.  
  6. namespace ABC
  7. {
  8.     static class Program
  9.     {
  10.         static void Main(string[] args)
  11.         {
  12.             List<int> L = new List<int>() { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, };
  13.  
  14.             List<int> L2 = L.Swap(0, 9).ShowConsole().ToList();
  15.  
  16.             return;
  17.         }
  18.  
  19.         public static IEnumerable<T> Swap<T>(this IEnumerable<T> Collection, int IdxA, int IdxB)
  20.         {
  21.             for (int i = 0; i < Collection.Count(); i++)
  22.             {
  23.                 if (i == IdxA)
  24.                 {
  25.                     yield return Collection.ElementAt(IdxB);
  26.                     continue;
  27.                 }
  28.                 if (i == IdxB)
  29.                 {
  30.                     yield return Collection.ElementAt(IdxA);
  31.                     continue;
  32.                 }
  33.                 yield return Collection.ElementAt(i);
  34.             }
  35.         } 
  36.         public static IEnumerable<T> ShowConsole<T>(this IEnumerable<T> Collection)
  37.         {
  38.  
  39.             foreach (var o in Collection)
  40.             {
  41.                 Console.WriteLine(o);
  42.             }
  43.  
  44.             return Collection;
  45.         }
  46.     }
  47. }
Success #stdin #stdout 0.03s 37072KB
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https://ideone.com/GLNHC
language:
C# (gmcs 5.20.1)
created:
12 years ago
visibility:
public

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