是否有任何图书馆将带有拼音标记的数字拼音转换为拼音？

public static string ConvertNumericalPinYinToAccented(string input)
    {
        Dictionary<int, string> PinyinToneMark = new Dictionary<int, string>
        {
            {0, \"aoeiuv\\u00fc\"},
            {1, \"\\u0101\\u014d\\u0113\\u012b\\u016b\\u01d6\\u01d6\"},
            {2, \"\\u00e1\\u00f3\\u00e9\\u00ed\\u00fa\\u01d8\\u01d8\"},
            {3, \"\\u01ce\\u01d2\\u011b\\u01d0\\u01d4\\u01da\\u01da\"},
            {4, \"\\u00e0\\u00f2\\u00e8\\u00ec\\u00f9\\u01dc\\u01dc\"}
        };

        string[] words = input.Split(\' \');
        string accented = \"\";
        string t = \"\";
        foreach (string pinyin in words)
        {
            foreach (char c in pinyin)
            {
                if (c >= \'a\' && c <= \'z\')
                {
                    t += c;
                }
                else if (c == \':\')
                {
                    if (t[t.Length - 1] == \'u\')
                    {
                        t = t.Substring(0, t.Length - 2) + \"\\u00fc\";
                    }
                }
                else
                {
                    if (c >= \'0\' && c <= \'5\')
                    {
                        int tone = (int)Char.GetNumericValue(c) % 5;

                        if (tone != 0)
                        {
                            Match match = Regex.Match(t, \"[aoeiuv\\u00fc]+\");
                            if (!match.Success)
                            {
                                t += c;
                            }
                            else if (match.Groups[0].Length == 1)
                            {
                                t = t.Substring(0, match.Groups[0].Index) +
                                    PinyinToneMark[tone][PinyinToneMark[0].IndexOf(match.Groups[0].Value[0])]
                                    + t.Substring(match.Groups[0].Index + match.Groups[0].Length);
                            }
                            else
                            {
                                if (t.Contains(\"a\"))
                                {
                                    t = t.Replace(\"a\", PinyinToneMark[tone][0].ToString());
                                }
                                else if (t.Contains(\"o\"))
                                {
                                    t = t.Replace(\"o\", PinyinToneMark[tone][1].ToString());
                                }
                                else if (t.Contains(\"e\"))
                                {
                                    t = t.Replace(\"e\", PinyinToneMark[tone][2].ToString());
                                }
                                else if (t.Contains(\"ui\"))
                                {
                                    t = t.Replace(\"i\", PinyinToneMark[tone][3].ToString());
                                }
                                else if (t.Contains(\"iu\"))
                                {
                                    t = t.Replace(\"u\", PinyinToneMark[tone][4].ToString());
                                }
                                else
                                {
                                    t += \"!\";
                                }
                            }
                        }
                    }
                    accented += t;
                    t = \"\";
                }
            }
            accented += t + \" \";
        }
        accented = accented.TrimEnd();
        return accented;
    }

t = t.Substring(0, t.Length - 2) + \"\\u00fc\";

t = t.Substring(0, t.Length - 1) + \"\\u00fc\";