C#十进制与任意进制的转换

         /// <summary>
         /// 将十进制转换为指定的进制
         /// </summary>
         /// <param name="Val">十进制值</param>
         /// <param name="TargetRadix">目标进制</param>
         /// <param name="BaseChar">基数列表(长度必须大于源字符串进制,无I，O)</param>
         /// <returns></returns>
         public static string JinZhiConvert(ulong Val, int TargetRadix = , string BaseChar = "0123456789ABCDEFGHJKLMNPQRSTUVWXYZ")
         {
             if (TargetRadix ==  && BaseChar.Length == ) return "长度与基数不能同时为零";
             if (TargetRadix <= ) 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 > );
             r.Reverse();
             return string.Join("", r.ToArray());
         }

         /// <summary>
         /// 将任意进制转化为十制
         /// </summary>
         /// <param name="Val">任意进制的字任串</param>
         /// <param name="SourceRadix">源字符串的进制</param>
         /// <param name="BaseChar">基数列表(长度必须大于源字符串进制,无I，O)</param>
         /// <returns></returns>
         public static ulong JinZhiConvert(string Val, int SourceRadix = , string BaseChar = "0123456789ABCDEFGHJKLMNPQRSTUVWXYZ")
         {
             ulong r = ;
             if (BaseChar == "") return ;
             if (SourceRadix == ) SourceRadix = BaseChar.Length;
             List<char> v = Val.ToCharArray().ToList();
             v.Reverse();
             for (int i = ; i < v.Count; i++)
             {
                 int index = BaseChar.IndexOf(v[i]);
                 if (index > -)
                     r += Convert.ToUInt64(index * Math.Pow(SourceRadix, i));
             }
             return r;
         }