C# 字符串进制转换

/// <summary>
        /// 进制转换
        /// </summary>
        /// <param name="input"></param>
        /// <param name="fromType">原来的进制格式</param>
        /// <param name="toType">要转换成的进制格式</param>
        /// <returns></returns>
        public string ConvertGenericBinary(string input, byte fromType, byte toType)
        {
            string output = input;
            switch (fromType)
            {
                case 2:
                    output = ConvertGenericBinaryFromBinary(input, toType);
                    break;
                case 8:
                    output = ConvertGenericBinaryFromOctal(input, toType);
                    break;
                case 10:
                    output = ConvertGenericBinaryFromDecimal(input, toType);
                    break;
                case 16:
                    output = ConvertGenericBinaryFromHexadecimal(input, toType);
                    break;
                default:
                    break;
            }
            return output;
        }

        /// <summary>
        /// 从二进制转换成其他进制
        /// </summary>
        /// <param name="input"></param>
        /// <param name="toType"></param>
        /// <returns></returns>
        private string ConvertGenericBinaryFromBinary(string input, byte toType)
        {
            switch (toType)
            {
                case 8:
                    //先转换成十进制然后转八进制
                    input = Convert.ToString(Convert.ToInt32(input, 2), 8);
                    break;
                case 10:
                    input = Convert.ToInt32(input, 2).ToString();
                    break;
                case 16:
                    input = Convert.ToString(Convert.ToInt32(input, 2), 16);
                    break;
                default:
                    break;
            }
            return input;
        }

        /// <summary>
        /// 从八进制转换成其他进制
        /// </summary>
        /// <param name="input"></param>
        /// <param name="toType"></param>
        /// <returns></returns>
        private string ConvertGenericBinaryFromOctal(string input, byte toType)
        {
            switch (toType)
            {
                case 2:
                    input = Convert.ToString(Convert.ToInt32(input, 8), 2);
                    break;
                case 10:
                    input = Convert.ToInt32(input, 8).ToString();
                    break;
                case 16:
                    input = Convert.ToString(Convert.ToInt32(input, 8), 16);
                    break;
                default:
                    break;
            }
            return input;
        }

        /// <summary>
        /// 从十进制转换成其他进制
        /// </summary>
        /// <param name="input"></param>
        /// <param name="toType"></param>
        /// <returns></returns>
        private string ConvertGenericBinaryFromDecimal(string input, int toType)
        {
            string output = "";
            int intInput = Convert.ToInt32(input);
            switch (toType)
            {
                case 2:
                    output = Convert.ToString(intInput, 2);
                    break;
                case 8:
                    output = Convert.ToString(intInput, 8);
                    break;
                case 16:
                    output = Convert.ToString(intInput, 16);
                    break;
                default:
                    output = input;
                    break;
            }
            return output;
        }

        /// <summary>
        /// 从十六进制转换成其他进制
        /// </summary>
        /// <param name="input"></param>
        /// <param name="toType"></param>
        /// <returns></returns>
        private string ConvertGenericBinaryFromHexadecimal(string input, int toType)
        {
            switch (toType)
            {
                case 2:
                    input = Convert.ToString(Convert.ToInt32(input, 16), 2);
                    break;
                case 8:
                    input = Convert.ToString(Convert.ToInt32(input, 16), 8);
                    break;
                case 10:
                    input = Convert.ToInt32(input, 16).ToString();
                    break;
                default:
                    break;
            }
            return input;
        }