回答編集履歴
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こういうことですかね。
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```csharp
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using System;
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using System.Collections.Generic;
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using System.Linq;
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7
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8
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class Program
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{
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public static void Main()
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{
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Console.WriteLine((new ConvertHelper()).ToString(192));
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Console.WriteLine((new ConvertHelper()).ToLong("25"));
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}
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}
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internal class ConvertHelper
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{
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private readonly string Chars;
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private readonly int Stem;
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public ConvertHelper(int stem, string chars)
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{
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if(stem < 1) throw new ArgumentOutOfRangeException();
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if (chars.Length != (new HashSet<char>(chars)).Count) throw new ArgumentOutOfRangeException();
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Chars = chars;
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Stem = stem;
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}
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public ConvertHelper(int stem, IEnumerable<char> chars) : this(stem, string.Join(string.Empty, chars))
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{
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}
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public ConvertHelper() : this(95, @"0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ!""#$%&'()*+,-./:;<=>?@[]^_`{|}~ ") { }
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public string ToString(long number) => string.Join(string.Empty, NextDigit(number).Reverse());
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public string ToString(int number) => ToString((long)number);
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private IEnumerable<char> NextDigit(long number)
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{
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while (number > 0)
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{
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yield return Chars[(int)(number % Stem)];
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number /= Stem;
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}
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}
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public long ToLong(string express)
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{
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return (long)express.Reverse().Select((c,i) => (long)Chars.IndexOf(c) * Math.Pow(Stem, i)).Sum();
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}
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}
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```
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52
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[36進数までのサンプル](https://www.atmarkit.co.jp/fdotnet/dotnettips/965radixconvert/radixconvert.html)を参考に頑張ってください。
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