C#实现整型数据字任意编码任意进制的转换和逆转换

实现如下：

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Text; 
 
namespace ConsoleApplication1 
{ 
 
    public class Number 
    { 
        public string Characters 
        { 
            get; 
            set; 
        } 
 
        public int Length 
        { 
            get 
            { 
                if (Characters != null) 
                    return Characters.Length; 
                else 
                    return 0; 
            } 
 
        } 
 
        public Number() 
        { 
            Characters = "0123456789"; 
        } 
 
        public Number(string characters) 
        { 
            Characters = characters; 
        } 
 
        /// <summary> 
        /// 数字转换为指定的进制形式字符串 
        /// </summary> 
        /// <param name="number"></param> 
        /// <returns></returns> 
        public string ToString(long number) 
        { 
            List<string> result = new List<string>(); 
            long t = number; 
 
            while (t > 0) 
            { 
                var mod = t % Length; 
                t = Math.Abs(t / Length); 
                var character = Characters[Convert.ToInt32(mod)].ToString(); 
                result.Insert(0, character); 
            } 
 
            return string.Join("", result.ToArray()); 
        }  
 
        /// <summary> 
        /// 指定字符串转换为指定进制的数字形式 
        /// </summary> 
        /// <param name="str"></param> 
        /// <returns></returns> 
        public long FromString(string str) 
        { 
            long result = 0; 
            int j = 0; 
            foreach (var ch in new string(str.ToCharArray().Reverse().ToArray())) 
            { 
                if (Characters.Contains(ch)) 
                { 
                    result += Characters.IndexOf(ch) * ((long)Math.Pow(Length, j)); 
                    j++; 
                } 
            } 
            return result; 
        } 
 
    } 
 
     
 
    class Program 
    { 
        static void Print(long number, Number adapter) 
        { 
            Console.WriteLine("输入数字：{0}", number); 
            Console.WriteLine("规则：{0}\t\t进制：{1}进制", adapter.Characters,adapter.Length); 
            var numtostr = adapter.ToString(number); 
            Console.WriteLine("转换结果：{0}", numtostr); 
            var strtonum = adapter.FromString(numtostr); 
            Console.WriteLine("逆向转换结果：{0}", strtonum); 
            Console.WriteLine(); 
            Console.WriteLine("============ 无聊的分割线============"); 
            Console.WriteLine(); 
        } 
 
        static void Main(string[] args) 
        { 
            //传统的2进制 
            Number n1 = new Number("01"); 
            //传统的8进制 
            Number n2 = new Number("01234567"); 
            //传统的16进制 
            Number n3 = new Number("0123456789ABCDEF"); 
            //自定义编码的N进制，这个可以用来做验证码？ 
            Number n4 = new Number("爹妈说名字太长躲在树后面会被部落发现"); 
            //山寨一个短网址 
            Number n5 = new Number("0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"); 
 
            Print(65535, n1); 
            Print(65535, n2); 
            Print(65535, n3); 
            Print(65535, n4); 
            Print(165535, n5); 
             
            Console.ReadKey(); 
 
        } 
    } 
}