c#实现二进制和八进制十进制十六进制的相互转换

namespace ConsoleApplication5
{
    class Program
    {

        static void Main(string[] args)
        {
            ChangeNum();

            Console.ReadLine();
        }

        private static void ChangeNum()
        {
            int number = 115342;

            string result = OnDECChange(number, 2);
            int r = OnSystemChange(result, 2);
            Console.WriteLine(number+"的2进制结果：" + result + " ：" + r);

            result = OnDECChange(number, 8);
            r = OnSystemChange(result, 8);
            Console.WriteLine(number + "的8进制结果：" + result + " ：" + r);

            result = OnDECChange(number, 10);
            r = OnSystemChange(result, 10);
            Console.WriteLine(number + "的10进制结果：" + result + " ：" + r);

            result = OnDECChange(number, 16);
            r = OnSystemChange(result, 16);
            Console.WriteLine(number + "的16进制结果：" + result + " ：" + r);
        }

        // 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
        // 0 1 2 3 4 5 6 7 8 9 A  B  C  D  E  F

        public static Dictionary<int, char> systemDic = new Dictionary<int, char>()
        {
            [0] = '0',
            [1] = '1',
            [2] = '2',
            [3] = '3',
            [4] = '4',
            [5] = '5',
            [6] = '6',
            [7] = '7',
            [8] = '8',
            [9] = '9',
            [10] = 'A',
            [11] = 'B',
            [12] = 'C',
            [13] = 'D',
            [14] = 'E',
            [15] = 'F',
        };

        /// <summary>
        /// 十进制数转二进制，八进制，十进制，十六进制
        /// </summary>
        /// <param name="number"></param>
        /// <param name="system"></param>
        /// <returns></returns>
        private static string OnDECChange(int number, int system)
        {
            List<int> resultList = new List<int>();
            while (true)
            {
                if (number < system)
                {
                    resultList.Add(number);
                    break;
                }
                int value = number / system;
                int remainder = number - value * system;
                number = value;
                resultList.Add(remainder);
            }
            resultList.Reverse();
            StringBuilder sb = new StringBuilder();
            for (int i = 0; i < resultList.Count; i++)
            {
                int r = resultList[i];
                sb.Append(systemDic[r]);
            }
            return sb.ToString();
        }


        public static Dictionary<char, int> baseDic = new Dictionary<char, int>()
        {
            ['0'] = 0,
            ['1'] = 1,
            ['2'] = 2,
            ['3'] = 3,
            ['4'] = 4,
            ['5'] = 5,
            ['6'] = 6,
            ['7'] = 7,
            ['8'] = 8,
            ['9'] = 9,
            ['A'] = 10,
            ['B'] = 11,
            ['C'] = 12,
            ['D'] = 13,
            ['E'] = 14,
            ['F'] = 15,
        };

        /// <summary>
        /// 二进制数转八进制，十进制，十六进制
        /// </summary>
        /// <param name="number"></param>
        /// <param name="system"></param>
        /// <returns></returns>
        public static int OnSystemChange(string number, int system)
        {
            int result = 0;
            int index = 0;
            for (int i = number.Length - 1; i >= 0; i--)
            {
                char key = number[i];
                try
                {
                    int value = baseDic[key];
                    result += value * (index == 0 ? 1 : (int)Math.Pow(system, index));
                    index++;
                }
                catch (Exception e)
                {
                    Console.WriteLine(e);
                    throw;
                }

            }
            return result;
      }
}