using System;
using System.Text;
using System.Globalization;
public class WordyFormatProvider : IFormatProvider, ICustomFormatter {
static readonly string[] _numberWords = "zero one two three four five six seven eight nine minus point".Split();
IFormatProvider _parent; // Allows consumers to chain format providers
public WordyFormatProvider() : this(CultureInfo.CurrentCulture) { }
public WordyFormatProvider(IFormatProvider parent) {
_parent = parent;
}
public object GetFormat(Type formatType) {
if (formatType == typeof(ICustomFormatter)) return this;
return null;
}
public string Format(string format, object arg, IFormatProvider prov) {
if (arg == null || format != "W")
return string.Format(_parent, "{0:" + format + "}", arg);
StringBuilder result = new StringBuilder();
string digitList = string.Format(CultureInfo.InvariantCulture,
"{0}", arg);
foreach (char digit in digitList) {
int i = "0123456789-.".IndexOf(digit);
if (i == -1) continue;
if (result.Length > 0) result.Append(' ');
result.Append(_numberWords[i]);
}
return result.ToString();
}
}
public class MainClass {
public static void Main() {
double n = -123.45;
IFormatProvider fp = new WordyFormatProvider();
Console.WriteLine(string.Format(fp, "{0:C} in words is {0:W}", n));
}
}
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