public List<string> subStringByCount(string text, int count)

        {

            int start_index = ;//开始索引

            int end_index = count - ;//结束索引

            double count_value = 1.0 * text.Length / count;

            double newCount = Math.Ceiling(count_value);//向上取整，只有有小数就取整，比如3.14，结果4

            List<string> list = new List<string>();

            for (int i = ; i < newCount; i++)

            {

                //如果end_index大于字符长度，则添加剩下字符串

                if (end_index > text.Length - )

                {

                    list.Add(text.Substring(start_index));

                    break;

                }

                else

                {

                    list.Add(text.Substring(start_index, count));

                    start_index += count;

                    end_index += count;

                }

            }

            return list;

        }