UserSimulation.ErrorGenerator.GetRandomStringFromDistribution C# (CSharp) Méthode

        private string GetRandomStringFromDistribution(Dictionary<string, double> distribution)
        {
            var rng = new Random();
            var rand = rng.NextDouble();

            int i = 0;
            double sum = distribution.ElementAt(i).Value;
            while (sum < rand)
            {
                i++;
                sum += distribution.ElementAt(i).Value;
            }

            var kvp = distribution.ElementAt(i);
            return kvp.Key;
        }