How to do dynamic loops For

Problem is
How to realize dynamic for-loops in source code

Visual Sudio solution you can dowload here

like this

for(int i = 0 ; i < 10 ; i++)
  for(int j = 0 ; j < 4 ; j++)
   for(int k = 0 ; k< 9 ; k++)
     ...........................
        ........................
          Console.Write( i , j , k ....)

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for this task i create class ManyFor

it simple to use (see ManyForTest)
ManyFor class generate all combination of i , j , k , ....

Example:

      int[] mm = new int[] { 3, 2, 4 };

      ManyFor mf = new ManyFor(mm);

      for (int s = 0; s < mf.Count(); s++)
      {
        ReadOnlyCollection<int> r = mf.Get(s);

        int i = r[0], j = r[1], k = r[2];

        Console.WriteLine(i + " " + j + " " + k);
      }

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OUTPUT :

0 0 0
0 0 1
0 0 2
0 0 3
0 1 0
0 1 1
0 1 2
0 1 3
1 0 0
1 0 1
1 0 2
1 0 3
1 1 0
1 1 1
1 1 2
1 1 3
2 0 0
2 0 1
2 0 2
2 0 3
2 1 0
2 1 1
2 1 2
2 1 3

// CLASS

  class ManyFor
  {
    readonly int[] id;    // all zero : 0 0 0 0 0 0
    readonly int[] max;   //     : 5 2 1 6 9 1
    readonly int[] div;

    int numberIteration = 1;
    int N;

    public ManyFor(int[] max)
    {
      
      N = max.Length;

      this.max = new int[N];
      id = new int[N];
      div = new int[N];

      for (int i = N - 1; i >= 0; i--)
      {
        if (max[i] < 0)
          throw new ArgumentOutOfRangeException("max", " must be >= 0 ");

        div[i] = numberIteration;
        this.max[i] = max[i];
        checked
        {
          numberIteration *= max[i];
        }
      }

      if (N == 0) numberIteration = 0;
    }

    public int Count()
    {
      return numberIteration;
    }

    public ReadOnlyCollection<int> Get(int n)
    {
      if (n < 0 || n >= numberIteration)
        throw new ArgumentOutOfRangeException("n", " n < 0 || n >= numberIteration n = " + n);

      for (int i = 0; i < N; i++)
      {
        id[i] = n / div[i];
        n -= id[i] * div[i];
      }

      return Array.AsReadOnly(id);
    }
  }

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//=========Class For Big Iterations=================================================

    private string GetString(int[] max )
    {
      m = new ManyForBig(max);

      StringBuilder s0 = new StringBuilder("");
      for (ReadOnlyCollection<int> r = m.Next(); r != null; r = m.Next())
        for (int j = 0; j < r.Count; j++)
          s0.Append(r[j]);

      return s0.ToString();
    }

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//=======================================================================

class ManyForBig
{
  readonly int[] id;    // all zero : 0 0 0 0 0 0
  readonly int[] max;   //     : 5 2 1 6 9 1

  private bool getFirst;
  private int N;


  private int index;  //  0 <= index < N

  public ManyForBig(int[] max)
  {

    N = max.Length;

    this.max = (new List<int>(max)).ToArray();
    id = new int[N];

    index = N - 1;
    getFirst = true;


    if (N == 0) index = -1;

    foreach (int i in max)
    {
      if (i < 0) throw new ArgumentOutOfRangeException("Error ManyFor i< 0");

      if (i == 0)
      {
        index = -1;
        break;
      }
    }
  }

  public ReadOnlyCollection<int> Next()
  {
    if (index == -1) return null;

    if (getFirst)
    {
      getFirst = false;
      return Array.AsReadOnly(id);
    }
    else if (id[index] + 1 == max[index])
    {

      for (; index >= 0 && id[index] + 1 == max[index]; index--)
      { }

      if (index == -1) return null; //end

      id[index]++;

      for (int i = index + 1; i < N; i++)
        id[i] = 0;

      index = N - 1;
    }
    else
    {
      id[index]++;
    }

    return Array.AsReadOnly(id);
  }
}

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//=========================================================

tags:
Many number of for-loops , Quesiton about nesting for loops, A generator for any number of for loop ,