public List<Tuple<string, string, int>> SetNumAttrb(Dictionary<string, string[]> dic)
    {
        List<Tuple<string, string, int>> attNumNom = new List<Tuple<string, string, int>>();
        int ctrl = 1;
        foreach (KeyValuePair<string, string[]> kvp in dic)
        {
            for (int i = 0; i < kvp.Value.Length; i++)
            {
                attNumNom.Add(Tuple.Create<string, string, int>(kvp.Key, dic[kvp.Key][i], ctrl));
                ctrl++;
            }
        }
        return attNumNom;
    }

List<Tuple<string, string, int>> list = SetNumAttrb(dict);

foreach (var tuple in list)
{
    Console.WriteLine("{0} - {1} - {2}", tuple.Item1, tuple.Item2, tuple.Item3.ToString());
}

Console.WriteLine(string.Join("rn", attNumNom));