private string NumberToFormat(double?value, string format)
{
format = format ?? Options.DefaultFormat;
string output;
// format based on value
if (value == 0 && Options.ZeroFormat != null)
{
output = Options.ZeroFormat;
}
else if (value == null && Options.NullFormat != null)
{
output = Options.NullFormat;
}
else
{
var factory = new FormatFactory();
var formatter = factory.GetNumberFormatter(format);
output = formatter.NumberToFormat(value, format, Options);
}
return(output);
}