整數數值 與 中文數字 與 英文數字 互相轉換(數值轉中文數字字串、中文數字字串轉數值)

ChineseAndEnglishNumberConvert.cs

//數字轉換為中文數字字串
public static class NumberExtension {
    #region decimal的數學指數計算
    public static decimal Power(decimal A ,decimal B) {
        decimal Result = 1;
        for(int i = 0; i < B; i++)
            Result *= A;
        return Result;
    }
    #endregion

    #region 中文單位對應字典
    static string[] ChineseNumberDictionary = "零壹貳參肆伍陸柒捌玖".ToCharArray().Select(item => new string(item ,1)).ToArray();
    static List<KeyValuePair<decimal ,string>> ChineseUnitDictionary = new List<KeyValuePair<decimal ,string>>() {
        new KeyValuePair<decimal,string>(Power(10, 0), "" ),
        new KeyValuePair<decimal,string>(Power(10, 1),"拾"),
        new KeyValuePair<decimal,string>(Power(10, 2),"佰"),
        new KeyValuePair<decimal,string>(Power(10, 3),"仟"),
        new KeyValuePair<decimal,string>(Power(10, 4),"萬"),
        new KeyValuePair<decimal,string>(Power(10, 8),"億"),
        new KeyValuePair<decimal,string>(Power(10,12),"兆"),
    };
    #endregion

    #region 英文單位對應字典
    static string[] EnglishNumberDictionary = "zero,one,two,three,four,five,six,seven,eight,nine,ten,eleven,twelve,thirteen,fourteen,fifteen,sixteen,seventeen,eighteen,nineteen,twenty,twentyone,twentytwo,twentythree,twentyfour,twentyfive,twentysix,twentyseven,twentyeight,twentynine,thirty,thirtyone,thirtytwo,thirtythree,thirtyfour,thirtyfive,thirtysix,thirtyseven,thirtyeight,thirtynine,forty,fortyone,fortytwo,fortythree,fortyfour,fortyfive,fortysix,fortyseven,fortyeight,fortynine,fifty,fiftyone,fiftytwo,fiftythree,fiftyfour,fiftyfive,fiftysix,fiftyseven,fiftyeight,fiftynine,sixty,sixtyone,sixtytwo,sixtythree,sixtyfour,sixtyfive,sixtysix,sixtyseven,sixtyeight,sixtynine,seventy,seventyone,seventytwo,seventythree,seventyfour,seventyfive,seventysix,seventyseven,seventyeight,seventynine,eighty,eightyone,eightytwo,eightythree,eightyfour,eightyfive,eightysix,eightyseven,eightyeight,eightynine,ninety,ninetyone,ninetytwo,ninetythree,ninetyfour,ninetyfive,ninetysix,ninetyseven,ninetyeight,ninetynine".Split(',');
    static List<KeyValuePair<decimal ,string>> EnglishUnitDictionary = new List<KeyValuePair<decimal ,string>>() {
        new KeyValuePair<decimal,string>(Power(10, 0), "" ),
        new KeyValuePair<decimal,string>(Power(10, 2), "hundred" ),
        new KeyValuePair<decimal,string>(Power(10, 3), "thousand"),
        new KeyValuePair<decimal,string>(Power(10, 6), "million"),
        new KeyValuePair<decimal,string>(Power(10, 9), "billion"),
    };
    #endregion

    public static decimal FromChineseNumber(string ChineseNumber) {
        ChineseNumber = ChineseNumber.Replace(ChineseNumberDictionary[0] ,"");
        if(ChineseNumber.Length == 0)return 0;
        
        KeyValuePair<decimal ,string> UnitValue = (from t in ChineseUnitDictionary where ChineseNumber.IndexOf(t.Value) > -1 orderby t.Key descending select t).FirstOrDefault();
        if(UnitValue.Key == 1)return Array.IndexOf(ChineseNumberDictionary ,ChineseNumber);

        string[] ChineseNumberSegments = ChineseNumber.Split(new string[]{UnitValue.Value},StringSplitOptions.None);

        decimal AddUnitValue = 1M,Result = 0M;
        for(int i = ChineseNumberSegments.GetUpperBound(0); i > -1; i--) {
            Result += FromChineseNumber(ChineseNumberSegments[i]) * AddUnitValue;
            AddUnitValue *= UnitValue.Key;
        }
        return Result;
    }
    public static string ToChineseNumber(decimal Value) {
        KeyValuePair<decimal ,string> UnitValue = (from t in ChineseUnitDictionary where Value - t.Key >= 0 orderby t.Key descending select t).FirstOrDefault();
        if(UnitValue.Key <= 1)
            return ChineseNumberDictionary[(long)Value];

        decimal SecondSegment ,FirstSegment = (Value - (SecondSegment = Value % UnitValue.Key)) / UnitValue.Key;

        if(SecondSegment == 0) {
            return ToChineseNumber(FirstSegment) + UnitValue.Value;
        } else {
            bool NeedZero = (Math.Floor(Math.Log10((double)UnitValue.Key)) - Math.Floor(Math.Log10((double)SecondSegment))) > 1;
            var Zero = NeedZero ? ToChineseNumber(0) : "";
            return ToChineseNumber(FirstSegment) + UnitValue.Value + Zero + ToChineseNumber(SecondSegment);
        }
    }

    public static string ToEnglishNumber(decimal Value) {
        KeyValuePair<decimal ,string> UnitValue = (from t in EnglishUnitDictionary where Value - t.Key >= 0 orderby t.Key descending select t).FirstOrDefault();
        if(UnitValue.Key <= 1)
            return EnglishNumberDictionary[(long)Value];

        decimal SecondSegment ,FirstSegment = (Value - (SecondSegment = Value % UnitValue.Key)) / UnitValue.Key;

        if(SecondSegment == 0) {
            return ToEnglishNumber(FirstSegment) + " " + UnitValue.Value;
        } else {
            return ToEnglishNumber(FirstSegment) + " " + UnitValue.Value + " " + ToEnglishNumber(SecondSegment);
        }
    }
}