Use subdivision codes

ISO 3166-2 subdivisions are represented by instances of the Iso3166Part2Subdivision type, which you access through predefined instances rather than constructing yourself.

Because ISO 3166-2 defines a distinct set of subdivision codes for most countries, the predefined subdivision codes are organised hierarchically by the country they belong to. This takes the form of nested classes on Iso3166Part2Subdivision named after the ISO 3166-1 alpha-2 country code, each containing a member for every subdivision code ISO 3166-2 defines for that country. For example:

// Australian Capital Territory
var act = Iso3166Part2Subdivision.AU._ACT;

You may notice that all subdivision codes start with an underscore. This is because of a technical limitation on identifier naming in .NET: an identifier cannot start with a digit, and some ISO 3166-2 subdivision codes do start with digits. To keep things consistent, every subdivision code member starts with an underscore.

To read the names and other metadata associated with a subdivision code, see Access country and subdivision metadata.