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方法的代码如下：
1 /// <summary> 2 /// 人民币大写 3 /// </summary> 4 /// <param name="input">待转换输入</param> 5 /// <param name="prefix">需要添加人民币前缀</param> 6 /// <exception cref="ArgumentException" /> 7 /// <returns>转换后的结果</returns> 8 public static string ToCapital(this string input, bool prefix = false) { 9 10 #region Step1 输入有效性验证 11 12 if (!Regex.IsMatch(input, @"(?<=-|^)\d*\.?\d*$")) 13 throw new ArgumentException("错误的输入金额！"); 14 15 if (Regex.IsMatch(input, @"^\d{25,}")) 16 throw new ArgumentException("输入数据太大无法转换！"); 17 18 #endregion 19 20 #region Step2 格式化为中间字符串 21 22 var positionDic = new Dictionary<int, string> { 23 {0,"F"},{1,"J"},{2,"."},{3,"S"},{4,"B"},{5,"Q"},{6,"W"},{7,"SW"},{8,"BW"},{9,"QW"}, 24 {10,"Y"},{11,"SY"},{12,"BY"},{13,"QY"},{14,"WY"},{15,"SWY"},{16,"BWY"},{17,"QWY"},{18,"YY"}, 25 {19,"SYY"},{20,"BYY"},{21,"QYY"},{22,"WYY"},{23,"SWYY"},{24,"BWYY"},{25,"QWYY"} 26 }; 27 28 input = Regex.Replace(input, @"^\.", "0."); 29 30 var integerPart = Regex.Replace(input, @"^-|\..*$", ""); 31 var _matchDecimal = Regex.Match(input, @"\.\d*$", RegexOptions.None); 32 var decimalPart = Regex.Replace(_matchDecimal.Success ? Convert.ToDouble(_matchDecimal.Value).ToString("0.00") : "00", @"0\.", ""); 33 34 var processStack = new Stack<string>(); 35 var charsArray = (integerPart + decimalPart).Reverse<char>(); 36 for (int i = 0; i < charsArray.Count(); i++) { 37 processStack.Push(string.Format("{0}{1}", charsArray.ElementAt(i), positionDic[i])); 38 } 39 40 //符号处理 keleyi.com 41 if (Regex.IsMatch(input, "^-", RegexOptions.None)) { 42 processStack.Push("-"); 43 } 44 if (prefix) { 45 processStack.Push("￥"); 46 } 47 48 var process = string.Empty; 49 while (processStack.Count > 0) { 50 process += processStack.Pop(); 51 } 52 //语义处理模式队列 53 Queue<Tuple<string, string, MatchEvaluator>> patterns = new Queue<Tuple<string, string, MatchEvaluator>>(); 54 var patternBuilder = new StringBuilder(); 55 for (int i = 3; i < positionDic.Count; i++) { 56 patternBuilder.AppendFormat("{0}{1}", (i == 3 ? "(0(?:" : "") + positionDic[i], i == positionDic.Count - 1 ? ")+?)+" : "|"); 57 } 58 patterns.Enqueue(Tuple.Create<string, string, MatchEvaluator>(patternBuilder.ToString(), "0", null)); 59 patterns.Enqueue(Tuple.Create<string, string, MatchEvaluator>(@"(?:\d+(?:QW|BW|SW|W|Q|B|S)?\d?YY)+", null, m => m.Value.Replace("YY", "") + "YY")); 60 patterns.Enqueue(Tuple.Create<string, string, MatchEvaluator>(@"(?:\d+(?:QW|BW|SW|W|Q|B|S)?\d?Y)+", null, m => m.Value.Replace("Y", "") + "Y")); 61 patterns.Enqueue(Tuple.Create<string, string, MatchEvaluator>(@"(?:\d+(?:Q|B|S)?\d?W)+", null, m => m.Value.Replace("W", "") + "W")); 62 patterns.Enqueue(Tuple.Create<string, string, MatchEvaluator>(@"(?!^)0+\.", ".", null)); 63 patterns.Enqueue(Tuple.Create<string, string, MatchEvaluator>(@"^0\.0J|^0\.", "", null)); 64 patterns.Enqueue(Tuple.Create<string, string, MatchEvaluator>("0J|0F", "0", null)); 65 patterns.Enqueue(Tuple.Create<string, string, MatchEvaluator>("J0?$", "JZ", null)); 66 patterns.Enqueue(Tuple.Create<string, string, MatchEvaluator>(@"\.$|\.0+$", ".Z", null)); 67 patterns.Enqueue(Tuple.Create<string, string, MatchEvaluator>(@"^0+$|^[^.]{0}$", "0.Z", null)); 68 69 while (patterns.Count > 0) { 70 var pattern = patterns.Dequeue(); 71 if (pattern.Item3 != null) { 72 process = Regex.Replace(process, pattern.Item1, pattern.Item3); 73 } 74 else { 75 process = Regex.Replace(process, pattern.Item1, pattern.Item2); 76 } 77 } 78 79 #endregion 80 81 #region Step3 翻译中间字符串 82 StringBuilder result = new StringBuilder(); 83 var translatorDic = new Dictionary<char, string> { 84 {'0',"零"},{'1',"壹"},{'2',"贰"},{'3',"叁"},{'4',"肆"},{'5',"伍"},{'6',"陆"},{'7',"柒"},{'8',"捌"},{'9',"玖"}, 85 {'S',"拾"},{'B',"佰"},{'Q',"仟"},{'W',"萬"},{'Y',"亿"}, 86 {'￥',"人民币"},{'-',"负"},{'.',"圆"},{'J',"角"},{'F',"分"},{'Z',"整"} 87 }; 88 for (int i = 0; i < process.Length; i++) { 89 result.Append(translatorDic[process[i]]); 90 } 91 #endregion 92 93 return result.ToString(); 94 }
http://www.cnblogs.com/roucheng/
一个人民币大写的扩展方法。感觉还是有点复杂，请朋友们帮忙优化下或是给个思路。
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