dict sorting method

       Dictionary<int, double> SortowanieSlownika(Dictionary<int, double> slownik)
        {
            Dictionary<int, double> sortowany = slownik;

            List<KeyValuePair<int, double>> tempList = new List<KeyValuePair<int, double>>(sortowany);

            tempList.Sort(delegate (KeyValuePair<int, double> firstPair, KeyValuePair<int, double> secondPair)
            {
                return firstPair.Value.CompareTo(secondPair.Value);
            }
                         );

            tempList.Reverse();

            Dictionary<int, double> posortowany = new Dictionary<int, double>();
            foreach (KeyValuePair<int, double> pair in tempList)
            {
                posortowany.Add(pair.Key, pair.Value);
            }

            return posortowany;
        }