HawkN.Iso.Countries

HawkN.Iso.Countries provides ISO 3166-1 country codes (Alpha-2, Alpha-3), official names, numeric codes (UN M49), and validation services.

Features

• Comprehensive Country List – Provides an up-to-date ISO 3166-1 country data with numeric codes from UN M49.
• Strongly Typed Codes – TwoLetterCode and ThreeLetterCode enums are generated at compile-time.
• Multiple Search Methods – Lookup by Alpha-2, Alpha-3, Numeric code, or Country Name.
• Advanced Validation – Built-in ValidationResult providing detailed feedback for code and name verification.
• Ultra-Fast Performance – O(1) lookups via pre-indexed static dictionaries.
• Lightweight & Dependency-Free – Compatible with .NET 8 and above.

---

Getting Started

Install via NuGet

dotnet add package HawkN.Iso.Countries

Required Namespaces

using HawkN.Iso.Countries; using HawkN.Iso.Countries.Abstractions; using HawkN.Iso.Countries.Models; using HawkN.Iso.Countries.Extensions;

---

Usage Example

Registration

Register the service in your DI container:

using var host = Host.CreateDefaultBuilder(args) .ConfigureServices(services => { services.AddCountryCodeService(); }) .Build();

Retrieval & Search

The service provides O(1) lookups via pre-indexed dictionaries and efficient partial searching.

var service = scope.ServiceProvider.GetRequiredService<ICountryCodeService>(); // Get all countries sorted by name var countries = service.GetAll(); // Lookup by string (Supports Alpha-2, Alpha-3, or Numeric) var germany = service.FindByCode("DE"); var austria = service.FindByCode("040"); // Lookup by Name var france = service.FindByName("France"); // Strongly typed lookup var uk = service.Get(CountryCode.TwoLetterCode.GB); // Strongly typed lookup var uk = service.Get(CountryCode.TwoLetterCode.GB); // Scenario: User types "Republic" in a search box var searchResults = service.SearchByName("Republic"); foreach (var country in searchResults) { // Will return: // 1. Republic of Korea // 2. Czech Republic // 3. Lao People's Democratic Republic... Console.WriteLine($"{country.Name} ({country.OfficialName})"); } // Pro Tip: Use for suggestion lists var suggestions = service.SearchByName("United") .Select(c => c.Name) .Take(5); // Returns: ["United Arab Emirates", "United Kingdom", "United States", ...]

Validation

Check if a code or name is valid and retrieve the model simultaneously:

// Validate by Code var result = service.ValidateByCode("US", out var country); if (result.IsValid) { Console.WriteLine($"Found: {country.Name}"); } // Validate by Name var nameResult = service.ValidateByName("Unknown Land", out _); if (!nameResult.IsValid) { Console.WriteLine($"Error: {nameResult.Reason}"); }

Fluent String Extensions

string input = "FRA"; // Direct conversion var country = input.ToCountry(service); // Quick check if ("US".IsCountryCode(service)) { // ... } // Quick validation var validationResult = "US".ValidateAsCountryCode(countryCodeService, out var _); if (validationResult.IsValid) { // ... }

Emoji Flags Support

The library provides an easy way to display country flags using standard Unicode Emoji. This works without any external image assets and is perfect for lightweight UI components.

var country = service.Get(CountryCode.TwoLetterCode.FI); // Get the emoji flag using the extension method string flag = country.GetEmojiFlag(); Console.WriteLine($"{flag} {country.Name}"); // Output: 🇫🇮 Finland

---

Supported countries

See the country list with the link Last updated at 25.12.2025.

---

Generated Types

• CountryCode.TwoLetterCode – Enum for Alpha-2 codes (e.g., US, GB).
• CountryCode.ThreeLetterCode – Enum for Alpha-3 codes (e.g., USA, GBR).
• Country – Model containing Name, enums, string codes, and NumericCode.

---

License

Code License

The source code of HawkN.Iso.Countries is licensed under the MIT License.

Data License

Country data (ISO 3166-1 and UN M49 numeric codes) is sourced from the UN Statistics Division – M49 standard

---

Troubleshooting: Emoji Display

If you see ?? instead of flags in your console:

1. Ensure your console output encoding is set to UTF-8: Console.OutputEncoding = System.Text.Encoding.UTF8;
2. Use a modern terminal like Windows Terminal or VS Code Terminal.
3. Use a font that supports Emojis (e.g., Segoe UI Emoji or Cascadia Code).

---

References

• ISO 3166 Standard
• UN Statistics Division – M49 standard
• GitHub Repository