Thinktecture.Runtime.Extensions 10.2.0-beta03

Thinktecture.Runtime.Extensions

A .NET library that uses Roslyn Source Generators, Analyzers, and CodeFixes to give you Smart Enums, Value Objects, and Discriminated Unions with built-in validation, exhaustive pattern matching, and first-class framework integration -- so you write the declaration and the generator handles the boilerplate.

Quick Start

Install-Package Thinktecture.Runtime.Extensions

Smart Enums

Type-safe enumerations that go beyond plain enum. Each item can carry its own data and behavior, the generator produces equality, parsing, Switch/Map, and serializer integration automatically.

[SmartEnum<string>]
public partial class ShippingMethod
{
   public static readonly ShippingMethod Standard = new("STANDARD", basePrice: 5.99m, estimatedDays: 5);
   public static readonly ShippingMethod Express = new("EXPRESS", basePrice: 15.99m, estimatedDays: 2);

   public decimal CalculatePrice(decimal weight) => _basePrice + weight;
}

Full documentation -- customization, real-world examples, performance tips, framework integration.

Value Objects

Immutable domain primitives that eliminate primitive obsession. Wrap a single value or multiple properties, add validation, and get factory methods, equality, conversion operators, and serialization for free.

Simple value object

[ValueObject<decimal>]
public partial struct Amount
{
    static partial void ValidateFactoryArguments(ref ValidationError? validationError, ref decimal value)
    {
        if (value < 0)
            validationError = new ValidationError("Amount cannot be negative");
    }
}

Complex value object

[ComplexValueObject]
public partial class Boundary
{
    public decimal Lower { get; }
    public decimal Upper { get; }

    static partial void ValidateFactoryArguments(ref ValidationError? validationError, ref decimal lower, ref decimal upper)
    {
        if (lower > upper)
            validationError = new ValidationError("Lower must be less than or equal to Upper");
    }
}

Full documentation -- simple & complex value objects, customization, framework integration.

Discriminated Unions

Model "one of" types with full type safety. Choose ad-hoc unions for quick combinations (Union<T1, T2>) or regular unions (Union) for rich domain modeling with exhaustive Switch/Map.

Ad-hoc union

[Union<string, int>]
public partial struct TextOrNumber;

Regular union

[Union]
public partial record Result<T>
{
    public sealed record Success(T Value) : Result<T>;
    public sealed record Failure(string Error) : Result<T>;
}

Full documentation -- ad-hoc unions, regular unions, customization, framework integration.

Framework Integration

All generated types integrate with the .NET ecosystem out of the box:

• System.Text.Json -- zero-allocation span-based serialization on .NET 9+
• Entity Framework Core -- value converters for EF Core 8, 9, and 10
• ASP.NET Core -- model binding and Minimal API parameter binding via IParsable<T>
• MessagePack -- binary serialization support
• Newtonsoft.Json -- JsonConverter support
• Swashbuckle / OpenAPI -- schema and operation filters

Packages

Package	NuGet
Thinktecture.Runtime.Extensions
Thinktecture.Runtime.Extensions.Json
Thinktecture.Runtime.Extensions.Newtonsoft.Json
Thinktecture.Runtime.Extensions.MessagePack
Thinktecture.Runtime.Extensions.EntityFrameworkCore8
Thinktecture.Runtime.Extensions.EntityFrameworkCore9
Thinktecture.Runtime.Extensions.EntityFrameworkCore10
Thinktecture.Runtime.Extensions.AspNetCore
Thinktecture.Runtime.Extensions.Swashbuckle

Requirements

• C# 11 (or higher) for generated code
• SDK 8.0.416 (or higher) for building projects

Documentation

• Smart Enums -- overview, real-world examples, design patterns
  • Customization -- attribute settings, equality, comparison, parsable interfaces
  • Framework Integration -- JSON, EF Core, ASP.NET Core, MessagePack
  • Performance -- span-based JSON, zero-allocation parsing, benchmarks
• Value Objects -- simple & complex value objects, validation
  • Customization -- attribute settings, equality comparers, factory methods, operators
  • Framework Integration -- JSON, EF Core, ASP.NET Core, MessagePack
• Discriminated Unions -- ad-hoc and regular unions, pattern matching
  • Customization -- backing fields, stateless types, constructors
  • Framework Integration -- JSON, EF Core, MessagePack
• Object Factories -- custom creation logic for advanced parsing and deserialization
• Analyzer Diagnostics -- reference for all TTRESG diagnostic rules
• Source Generator Configuration -- MSBuild properties for controlling generator behavior

Articles

Smart Enums:

• Smart Enums: Beyond Traditional Enumerations in .NET
• Smart Enums: Adding Domain Logic to Enumerations in .NET
• Smart Enums in .NET: Integration with Frameworks and Libraries

Value Objects:

• Value Objects: Solving Primitive Obsession in .NET
• Handling Complexity: Introducing Complex Value Objects in .NET
• Value Objects in .NET: Integration with Frameworks and Libraries
• Value Objects in .NET: Enhancing Business Semantics
• Advanced Value Object Patterns in .NET

Discriminated Unions:

• Discriminated Unions: Representation of Alternative Types in .NET
• Pattern Matching with Discriminated Unions in .NET
• Discriminated Unions in .NET: Modeling States and Variants
• Discriminated Unions in .NET: Integration with Frameworks and Libraries

Migrations

• Migration from v9 to v10
• Migration from v8 to v9