/// <summary> /// 人民币大写 /// </summary> /// <param name="input">待转换输入</param> /// <param name="prefix">需要添加人民币前缀</param> /// <exception cref="ArgumentException" /> /// <returns>转换后的结果</returns> public static string ToCapital(this string input, bool prefix = false) {     #region Step1 输入有效性验证     if (!Regex.IsMatch(input, @"(?<=-|^)\d*\.?\d*$"))         throw new ArgumentException("错误的输入金额！");     if (Regex.IsMatch(input, @"^\d{25,}"))         throw new ArgumentException("输入数据太大无法转换！");     #endregion     #region Step2 格式化为中间字符串     var positionDic = new Dictionary<int, string> {         {0,"F"},{1,"J"},{2,"."},{3,"S"},{4,"B"},{5,"Q"},{6,"W"},{7,"SW"},{8,"BW"},{9,"QW"},         {10,"Y"},{11,"SY"},{12,"BY"},{13,"QY"},{14,"WY"},{15,"SWY"},{16,"BWY"},{17,"QWY"},{18,"YY"},         {19,"SYY"},{20,"BYY"},{21,"QYY"},{22,"WYY"},{23,"SWYY"},{24,"BWYY"},{25,"QWYY"}                    };     input = Regex.Replace(input, @"^\.", "0.");     var integerPart = Regex.Replace(input, @"^-|\..*$", "");     var _matchDecimal = Regex.Match(input, @"\.\d*$", RegexOptions.None);     var decimalPart = Regex.Replace(_matchDecimal.Success ? Convert.ToDouble(_matchDecimal.Value).ToString("0.00") : "00", @"0\.", "");     var processStack = new Stack<string>();     var charsArray = (integerPart + decimalPart).Reverse<char>();     for (int i = 0; i < charsArray.Count(); i++) {         processStack.Push(string.Format("{0}{1}", charsArray.ElementAt(i), positionDic[i]));     }     //符号处理     if (Regex.IsMatch(input, "^-", RegexOptions.None)) {         processStack.Push("-");     }     if (prefix) {         processStack.Push("￥");     }     var process = string.Empty;     while (processStack.Count > 0) {         process += processStack.Pop();     }     //语义处理模式队列     Queue<Tuple<string, string, MatchEvaluator>> patterns = new Queue<Tuple<string, string, MatchEvaluator>>();     var patternBuilder = new StringBuilder();     for (int i = 3; i < positionDic.Count; i++) {         patternBuilder.AppendFormat("{0}{1}", (i == 3 ? "(0(?:" : "") + positionDic[i], i == positionDic.Count - 1 ? ")+?)+" : "|");     }     patterns.Enqueue(Tuple.Create<string, string, MatchEvaluator>(patternBuilder.ToString(), "0", null));     patterns.Enqueue(Tuple.Create<string, string, MatchEvaluator>(@"(?:\d+(?:QW|BW|SW|W|Q|B|S)?\d?YY)+", null, m => m.Value.Replace("YY", "") + "YY"));     patterns.Enqueue(Tuple.Create<string, string, MatchEvaluator>(@"(?:\d+(?:QW|BW|SW|W|Q|B|S)?\d?Y)+", null, m => m.Value.Replace("Y", "") + "Y"));     patterns.Enqueue(Tuple.Create<string, string, MatchEvaluator>(@"(?:\d+(?:Q|B|S)?\d?W)+", null, m => m.Value.Replace("W", "") + "W"));     patterns.Enqueue(Tuple.Create<string, string, MatchEvaluator>(@"(?!^)0+\.", ".", null));     patterns.Enqueue(Tuple.Create<string, string, MatchEvaluator>(@"^0\.0J|^0\.", "", null));     patterns.Enqueue(Tuple.Create<string, string, MatchEvaluator>("0J|0F", "0", null));     patterns.Enqueue(Tuple.Create<string, string, MatchEvaluator>("J0?$", "JZ", null));     patterns.Enqueue(Tuple.Create<string, string, MatchEvaluator>(@"\.$|\.0+$", ".Z", null));     patterns.Enqueue(Tuple.Create<string, string, MatchEvaluator>(@"^0+$|^[^.]{0}$", "0.Z", null));     while (patterns.Count > 0) {         var pattern = patterns.Dequeue();         if (pattern.Item3 != null) {             process = Regex.Replace(process, pattern.Item1, pattern.Item3);         }         else {             process = Regex.Replace(process, pattern.Item1, pattern.Item2);         }     }     #endregion     #region Step3 翻译中间字符串     StringBuilder result = new StringBuilder();     var translatorDic = new Dictionary<char, string> {         {'0',"零"},{'1',"壹"},{'2',"贰"},{'3',"叁"},{'4',"肆"},{'5',"伍"},{'6',"陆"},{'7',"柒"},{'8',"捌"},{'9',"玖"},         {'S',"拾"},{'B',"佰"},{'Q',"仟"},{'W',"萬"},{'Y',"亿"},         {'￥',"人民币"},{'-',"负"},{'.',"圆"},{'J',"角"},{'F',"分"},{'Z',"整"}     };     for (int i = 0; i < process.Length; i++) {         result.Append(translatorDic[process[i]]);     }     #endregion     return result.ToString(); }