C#十进制与任意进制的转换

 1         /// <summary>
 2         /// 将十进制转换为指定的进制
 3         /// </summary>
 4         /// <param name="Val">十进制值</param>
 5         /// <param name="TargetRadix">目标进制</param>
 6         /// <param name="BaseChar">基数列表(长度必须大于源字符串进制,无I，O)</param>
 7         /// <returns></returns>
 8         public static string JinZhiConvert(ulong Val, int TargetRadix = 0, string BaseChar = "0123456789ABCDEFGHJKLMNPQRSTUVWXYZ")
 9         {
10             if (TargetRadix == 0 && BaseChar.Length == 0) return "长度与基数不能同时为零";
11             if (TargetRadix <= 0) TargetRadix = BaseChar.Length;
12             List<string> r = new List<string>();
13             do
14             {
15                 ulong y = Val % (ulong)TargetRadix;
16                 r.Add(BaseChar[Convert.ToInt32(y)].ToString());
17                 Val = Convert.ToUInt64(Math.Floor(Val / (decimal)TargetRadix));
18             } while (Val > 0);
19             r.Reverse();
20             return string.Join("", r.ToArray());
21         }
22 
23 
24         /// <summary>
25         /// 将任意进制转化为十制
26         /// </summary>
27         /// <param name="Val">任意进制的字任串</param>
28         /// <param name="SourceRadix">源字符串的进制</param>
29         /// <param name="BaseChar">基数列表(长度必须大于源字符串进制,无I，O)</param>
30         /// <returns></returns>
31         public static ulong JinZhiConvert(string Val, int SourceRadix = 0, string BaseChar = "0123456789ABCDEFGHJKLMNPQRSTUVWXYZ")
32         {
33             ulong r = 0;
34             if (BaseChar == "") return 0;
35             if (SourceRadix == 0) SourceRadix = BaseChar.Length;
36             List<char> v = Val.ToCharArray().ToList();
37             v.Reverse();
38             for (int i = 0; i < v.Count; i++)
39             {
40                 int index = BaseChar.IndexOf(v[i]);
41                 if (index > -1)
42                     r += Convert.ToUInt64(index * Math.Pow(SourceRadix, i));
43             }
44             return r;
45         }