How to convert two-letter country codes to flag emojis?

Question

I have ISO 3166-1 (alpha-2) country codes, which are two-letter codes, such as "US" and "NL". How do I get the corresponding flag emoji?

EDIT: Preferably I would like to do this without using an explicit mapping between country codes and their corresponding emojis. It has been done in JavaScript but I'm not sure how to do it in C#.

Answer 1

Solution:

public static string IsoCountryCodeToFlagEmoji(this string country)
{
    return string.Concat(country.ToUpper().Select(x => char.ConvertFromUtf32(x + 0x1F1A5)));
}

string gb = "gb".IsoCountryCodeToFlagEmoji(); // 🇬🇧
string fr = "fr".IsoCountryCodeToFlagEmoji(); // 🇫🇷