C#十進制與任意進制的轉換

        /// <summary>
        /// 將十進制轉換為指定的進制
        /// </summary>
        /// <param name="Val">十進制值</param>
        /// <param name="TargetRadix">目標進制</param>
        /// <param name="BaseChar">基數列表(長度必須大於源字符串進制,無I，O)</param>
        /// <returns></returns>
        public static string JinZhiConvert(ulong Val, int TargetRadix = 0, string BaseChar = "0123456789ABCDEFGHJKLMNPQRSTUVWXYZ")
        {
            if (TargetRadix == 0 && BaseChar.Length == 0) return "長度與基數不能同時為零";
            if (TargetRadix <= 0) TargetRadix = BaseChar.Length;
            List<string> r = new List<string>();
            do
            {
                ulong y = Val % (ulong)TargetRadix;
                r.Add(BaseChar[Convert.ToInt32(y)].ToString());
                Val = Convert.ToUInt64(Math.Floor(Val / (decimal)TargetRadix));
            } while (Val > 0);
            r.Reverse();
            return string.Join("", r.ToArray());
        }


        /// <summary>
        /// 將任意進制轉化為十制
        /// </summary>
        /// <param name="Val">任意進制的字任串</param>
        /// <param name="SourceRadix">源字符串的進制</param>
        /// <param name="BaseChar">基數列表(長度必須大於源字符串進制,無I，O)</param>
        /// <returns></returns>
        public static ulong JinZhiConvert(string Val, int SourceRadix = 0, string BaseChar = "0123456789ABCDEFGHJKLMNPQRSTUVWXYZ")
        {
            ulong r = 0;
            if (BaseChar == "") return 0;
            if (SourceRadix == 0) SourceRadix = BaseChar.Length;
            List<char> v = Val.ToCharArray().ToList();
            v.Reverse();
            for (int i = 0; i < v.Count; i++)
            {
                int index = BaseChar.IndexOf(v[i]);
                if (index > -1)
                    r += Convert.ToUInt64(index * Math.Pow(SourceRadix, i));
            }
            return r;
        }