C#_将集合的数据按照20一组拆分

            List<List<string>> listGroup = new List<List<string>>();
            int j = 20;
            for (int i = 0; i < srcDocCode.Count; i += 20)
            {
                List<string> cList = new List<string>();
                cList = srcDocCode.Take(j).Skip(i).ToList();
                j += 20;
                listGroup.Add(cList);
            }