How to get ISO 3166 Country Code from CultureInfo in .NET

Question

Given a CultureInfo object, how do I get the two character ISO 3166 Country Code? E.g. from en-US, I want US and from en-GB, I want GB. I also need to handle cases where the culture may not have a country code.

Answer 1

Use RegionInfo-class to retrieve two (or three) letter iso region name:

RegionInfo usa = new RegionInfo("en-US");           
string isoUSA = usa.TwoLetterISORegionName;

RegionInfo gb = new RegionInfo("en-GB");
string isoGB = gb.TwoLetterISORegionName;

You might want to catch possible exception that will happen if you try to pass invalid value to the constructor.

Answer 2

You can use this package

This library that provides access to ISO standards, including ISO 639 (language codes), ISO 3166 (country codes), and ISO 4217 (currency codes).

Example:

Country[] countries = Countries.Collection.Where(c => c.Name[0] == 'A').ToArray();
foreach (Country country in countries)
{
   Language[] langs = country.GetLanguages();
   Currency[] currencies = country.GetCurrencies();
   string langsColumn = string.Join(',', langs.Select(l => l.Name));
   string currenciesColumn = string.Join(',', currencies.Select(l=>l.Alpha3));
   Console.WriteLine($"{country.Alpha2};{country.Name};{currenciesColumn};{langsColumn}");
}