Validated.Primitives.Domain 1.1.28

Validated Primitives

A .NET library that provides strongly-typed, self-validating primitive value objects to eliminate primitive obsession and enforce domain constraints at compile-time.

Packages

This repository contains two NuGet packages:

📦 Validated.Primitives (Core)

The foundation library providing low-level validated primitive value objects.

dotnet add package Validated.Primitives

What it provides:

• Email addresses, phone numbers, URLs, IP addresses
• Postal codes with country-specific validation (30+ countries)
• Date/time value objects (DateOfBirth, FutureDate, date ranges)
• Financial primitives (Money, Percentage, CurrencyCode)
• Credit card primitives (CreditCardNumber, CreditCardSecurityNumber, CreditCardExpiration)
• Text primitives (HumanName, AddressLine, City, StateProvince)
• Validation framework and error handling
• JSON serialization support

📦 Validated.Primitives.Domain (Composition)

Higher-level domain models composed from validated primitives.

dotnet add package Validated.Primitives.Domain

What it provides:

• PersonName - Complete human name (first, last, middle) with computed properties (FullName, FormalName, Initials)
• Address - Physical mailing address with country-specific postal code validation
• ContactInformation - Email, primary/secondary phone, optional website
• CreditCardDetails - Complete payment card (number, CVV, expiration) with masking and expiration checking

Think of it as:

• Validated.Primitives = LEGO bricks (EmailAddress, PhoneNumber, PostalCode)
• Validated.Primitives.Domain = Complete LEGO models (Address, PersonName, ContactInformation)

What are Validated Primitives?

Validated Primitives are value objects that encapsulate primitive types (strings, dates, numbers) with built-in validation rules. Instead of passing raw strings or dates throughout your application, you use strongly-typed objects that guarantee their validity.

The Problem: Primitive Obsession

// ❌ Traditional approach - primitive obsession
public class User
{
    public string Email { get; set; }           // Could be null, empty, or invalid
    public string PhoneNumber { get; set; }     // No format validation
    public DateTime DateOfBirth { get; set; }   // Could be in the future!
    public string PostalCode { get; set; }      // No country-specific validation
}

// Validation logic scattered everywhere
if (string.IsNullOrWhiteSpace(user.Email) || !IsValidEmail(user.Email))
{
    throw new ArgumentException("Invalid email");
}

The Solution: Validated Primitives

// ✅ With Validated Primitives
public class User
{
    public EmailAddress Email { get; set; }       // Always valid or null
    public PhoneNumber PhoneNumber { get; set; }  // Always properly formatted
    public DateOfBirth DateOfBirth { get; set; }  // Always in the past
    public PostalCode PostalCode { get; set; }    // Country-specific validation
}

// Validation happens at creation - guaranteed valid everywhere else
var (result, email) = EmailAddress.TryCreate(userInput);
if (!result.IsValid)
{
    // Handle validation errors
    Console.WriteLine(result.ToBulletList());
    return;
}

// email is guaranteed to be valid here
user.Email = email;

Key Benefits

• Type Safety: Compiler prevents mixing up different string types
• Self-Validating: Validation logic lives with the data
• Immutable: Value objects are records - thread-safe by default
• Explicit Intent: Code clearly communicates business rules
• Centralized Validation: No scattered validation logic
• Rich Error Messages: Detailed validation feedback

Installation

dotnet add package Validated.Primitives

Available Value Objects

📧 Email & Communication

• EmailAddress - RFC 5322 compliant email format, max 256 characters
• PhoneNumber - International phone number validation with country code support
• WebsiteUrl - Valid HTTP/HTTPS URLs with proper scheme validation

📍 Location & Geography

• PostalCode - Country-specific postal code validation for 30+ countries
• City - City names, max 100 characters, letters/spaces/hyphens/apostrophes
• StateProvince - State or province names, max 100 characters
• AddressLine - Street address lines, max 200 characters

🌐 Network

• IpAddress - Valid IPv4 or IPv6 addresses

📅 Date & Time

• DateOfBirth - Must be in the past, cannot be future date
• FutureDate - Must be in the future, cannot be past date
• BetweenDatesSelection - Date within a specified range
• DateRange - Represents a range between two DateTimes with duration calculation
• DateOnlyRange - Represents a range between two DateOnly values
• TimeOnlyRange - Represents a range between two TimeOnly values

💳 Financial & Payment

• Money - Monetary amounts with currency codes and precision validation
• SmallUnitMoney - Monetary amounts in smallest currency unit (e.g., cents)
• Percentage - Percentage values with configurable decimal places
• CurrencyCode - ISO 4217 currency codes (USD, EUR, GBP, etc.)
• CreditCardNumber - Luhn-validated card numbers, 13-19 digits, rejects all-same-digit patterns
• CreditCardSecurityNumber - CVV/CVC security codes, 3-4 digits
• CreditCardExpiration - Card expiration date with automatic 2-digit year normalization

👤 Personal Information

• HumanName - Individual name parts (first, middle, last), 1-50 characters, letters/hyphens/apostrophes/spaces

API Integration Example

[ApiController]
[Route("api/[controller]")]
public class UsersController : ControllerBase
{
    [HttpPost]
    public IActionResult CreateUser([FromBody] CreateUserRequest request)
    {
        var (emailResult, email) = EmailAddress.TryCreate(request.Email, nameof(request.Email));
        if (!emailResult.IsValid)
        {
            return BadRequest(emailResult.ToDictionary());
        }
        
        var (phoneResult, phone) = PhoneNumber.TryCreate(request.Phone, nameof(request.Phone));
        if (!phoneResult.IsValid)
        {
            return BadRequest(phoneResult.ToDictionary());
        }
        
        var (postalResult, postalCode) = PostalCode.TryCreate(
            request.CountryCode, 
            request.PostalCode, 
            nameof(request.PostalCode)
        );
        if (!postalResult.IsValid)
        {
            return BadRequest(postalResult.ToDictionary());
        }
        
        // Create user with validated primitives
        var user = new User
        {
            Email = email,
            Phone = phone,
            PostalCode = postalCode
        };
        
        // Save user...
        
        return Ok(user);
    }
}

Using Validated.Primitives.Domain

For more complex scenarios, use the Validated.Primitives.Domain package which provides pre-built domain aggregates:

Complete User Profile Example

using Validated.Primitives.Domain;
using Validated.Primitives.ValueObjects;

// Create a complete address
var (addressResult, address) = Address.TryCreate(
    street: "123 Main Street",
    addressLine2: "Apt 4B",
    city: "New York",
    country: CountryCode.UnitedStates,
    postalCode: "10001",
    stateProvince: "NY"
);

// Create a person name
var (nameResult, personName) = PersonName.TryCreate(
    firstName: "John",
    lastName: "Doe",
    middleName: "Michael"
);

// Create contact information
var (contactResult, contact) = ContactInformation.TryCreate(
    countryCode: CountryCode.UnitedStates,
    email: "john.doe@example.com",
    primaryPhone: "+1-555-123-4567",
    secondaryPhone: null,
    website: "https://johndoe.com"
);

// Create credit card details
var (cardResult, card) = CreditCardDetails.TryCreate(
    cardNumber: "4111 1111 1111 1111",
    securityNumber: "123",
    expirationMonth: 12,
    expirationYear: 2025
);

if (addressResult.IsValid && nameResult.IsValid && 
    contactResult.IsValid && cardResult.IsValid)
{
    Console.WriteLine($"Name: {personName.FullName}");
    Console.WriteLine($"Formal: {personName.FormalName}");
    Console.WriteLine($"Initials: {personName.Initials}");
    
    Console.WriteLine($"\nAddress: {address}");
    
    Console.WriteLine($"\nContact: {contact.Email.Value}");
    Console.WriteLine($"Phone: {contact.PrimaryPhone.Value}");
    
    Console.WriteLine($"\nCard: {card.GetMaskedCardNumber()}");
    Console.WriteLine($"Expires: {card.Expiration}");
    Console.WriteLine($"Is Expired: {card.IsExpired()}");
}

Benefits of Domain Models

1. Grouped Validation - Validate all related fields in one call
2. Rich Behavior - FullName, FormalName, Initials, GetMaskedCardNumber(), IsExpired()
3. Cohesive APIs - Pass ContactInformation instead of Email + Phone + Website separately
4. Guaranteed Consistency - If you have an Address, all its parts are valid

Domain Models Available:

• PersonName - FirstName + LastName + MiddleName with computed properties
• Address - Complete mailing address with country-specific validation
• ContactInformation - Email + Phones + Website
• CreditCardDetails - CardNumber + CVV + Expiration with masking