遍历字母表 - C# a-caz [英] Iterating through the Alphabet - C# a-caz

问题描述

我有一个关于遍历 Alphabet 的问题.我想要一个以a"开头并以z"结尾的循环.之后，循环开始aa"并计数到az".之后从ba"开始到bz"等等......

I have a question about iterate through the Alphabet. I would like to have a loop that begins with "a" and ends with "z". After that, the loop begins "aa" and count to "az". after that begins with "ba" up to "bz" and so on...

有人知道解决办法吗?

我忘了我给函数一个字符a"然后函数必须返回b.如果你给出bnc"，那么函数必须返回bnd"

I forgot that I give a char "a" to the function then the function must return b. if u give "bnc" then the function must return "bnd"

推荐答案

完全按照 OP 最新编辑的要求进行

这是最简单的解决方案，经过测试:

This is the simplest solution, and tested:

static void Main(string[] args)
{
    Console.WriteLine(GetNextBase26("a"));
    Console.WriteLine(GetNextBase26("bnc"));
}

private static string GetNextBase26(string a)
{
    return Base26Sequence().SkipWhile(x => x != a).Skip(1).First();
}

private static IEnumerable<string> Base26Sequence()
{
    long i = 0L;
    while (true)
        yield return Base26Encode(i++);
}

private static char[] base26Chars = "abcdefghijklmnopqrstuvwxyz".ToCharArray();
private static string Base26Encode(Int64 value)
{
    string returnValue = null;
    do
    {
        returnValue = base26Chars[value % 26] + returnValue;
        value /= 26;
    } while (value-- != 0);
    return returnValue;
}

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