C#英文单词单数复数相互转换(string Plural Singular)

2008年9月16日 23:42:07 发布:yaosansi

单数转复数

１.字符串替换

      public static String toPlural(String name)

           String plural;

           if (name != null && name.Length> 0)

               char ch = name[name.Length - 1];

               StringBuilder pluralBuilder = new StringBuilder(name);

               if (ch == 's' || ch == 'x')

                   pluralBuilder.Append("es");

               else if (ch == 'y')

                   pluralBuilder.Remove(pluralBuilder.Length - 1,1);

                   pluralBuilder.Append("ies");

               else

                   pluralBuilder.Append("s");

               plural = pluralBuilder.ToString();

           else

               plural = name;

           return plural;

２.正则表达式匹配

       public string getPluralForWord(string word)

           string plural = null;

           Regex ES = new Regex("^.*(sh|ss|ch|o|i)$");

           Regex ICES = new Regex("^.*(ex|ix)$");

           Regex NOT_VOWEL_Y = new Regex("^.*[^aeiou]y$");

           if (!string.IsNullOrEmpty(word))

               plural = word + "s";

               if (ES.Match(word).Success)

                   plural = word + "es";

               else if (NOT_VOWEL_Y.Match(word).Success)

                   String stripY = word.Substring(0, word.Length - 1);

                   plural = stripY + "ies";

               else if (ICES.Match(word).Success)

                   String strip_X = word.Substring(0, word.Length - 2);

                   plural = strip_X + "ices";

           return plural;

复数转单数

       /// <summary>

       ///  Convert the input word from plural to singular

       /// </summary>

       /// <param name="plural"></param>

       /// <returns></returns>

       private string PluralToSingular(string plural)

           // convert to lowercase for easier comparison

           String lower = plural.ToLower();

           string res = string.Empty;

           // rule out a few exceptions

           if (lower == "feet")

               res = "Foot";

           else if (lower == "geese")

               res = "Goose";

           else if (lower == "men")

               res = "Man";

           else if (lower == "women")

               res = "Woman";

           else if (lower == "criteria")

               res = "Criterion";

           // plural uses "ies" if word ends with "y" preceeded by a non-vowel

           else if (lower.EndsWith("ies") && "aeiou".IndexOf(lower.Substring(lower.Length - 4, 1)) < 0)

               res = plural.Substring(0, plural.Length - 3) + "y";

           else

               res = plural.Substring(0, plural.Length - 1);

           // the result must preserve the original word//s capitalization

           if (plural == lower)

               return res.ToLower();// it was an all-lowercase word

           else if (plural == plural.ToUpper())

               return res.ToUpper();   // it was an all-uppercase word

           else

               return res;    // return whatever is in "res"

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