Use area codes

UN M49 area codes are exposed through two enums that key the area codes by either the alpha-2 or alpha-3 country codes from ISO 3166-1.

Although UN M49 defines area codes only in numeric form, technical limitations on identifier naming in .NET mean the enum members must take an alpha (or alpha-numeric) form. As a result, some area codes are only accessible as metadata, because they do not relate directly to an ISO 3166-1 country code.

To access an area code directly, you must first know the country code it relates to. For example:

var switzerlandAreaCode = (ushort)UnM49AreaByAlpha2CountryCode.CH;

Or by its alpha-3 country code:

var switzerlandAreaCode = (ushort)UnM49AreaByAlpha3CountryCode.CHE;

Other area codes can be retrieved indirectly from a member of one of these enums using the provided extension methods, which read this information from the area code’s metadata (see Access area metadata).