Question

i have problems with an array, i want get the values of positions, but without repeating the positions(with the next.random the values are repeat, but i need once get the position), i post my code for you see them. i hope you can help me.

  int d = 0;   

  for (int i = 0; i < caminohormiga.Length; i++)
       {
          int start2 = random.Next(0, caminohormiga.Length);

          d = caminohormiga[start2];
          MatrizAux[i] = d;

          if (caminohormiga[i] == 0)
             {
              Console.Write("Repetido");
             }
         Console.Write(caminohormiga[i] + ", ");
       }

Answer 1

You need to make an array of indexes, fill it with numbers zero through length minus one, make a random shuffle, and go through the shuffled array to pick the index of the original array.

You can use Fisher-Yates Shuffle algorithm to re-arrange the indexes.

var indexes = Enumerable.Range(0, caminohormiga.Length).ToArray();
// Run Fisher-Yates algorithm on indexes
...
foreach (var i in indexes) {
    var randomNoRepeat = caminohormiga[i];
    ...
}