language: C# (mono-2.8)
date: 1010 days 4 hours ago
link:
visibility: public 
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using System;
 
public class PluralFormatter : IFormatProvider, ICustomFormatter {
 
   public object GetFormat(Type formatType) {
      if (formatType == typeof(ICustomFormatter))
         return this;
      else
         return null;
   }
 
   public string Format(string format, object arg, 
                          IFormatProvider formatProvider)
   {   
      if (! formatProvider.Equals(this)) return null;
 
      if (! format.StartsWith("^")) return null;
 
      String[] parts = format.Split(new char[] {'^'});
      int choice = ((int) arg) == 1 ? 1 : 2;
      return String.Format("{0} {1}", arg, parts[choice]);
   }
 
   public static void Main() {
      Console.WriteLine(String.Format(
         new PluralFormatter(),
         "{0:^puppy^puppies}, {1:^child^children}, and {2:^kitten^kittens}", 
         13, 1, 42
      ));
   }
}