FactoryGenerator

.NET source generator that automatically generates and registers factories

Installation

Add the following packages to your project:

$ dotnet add package FactoryGenerator.Abstractions
$ dotnet add package FactoryGenerator.Microsoft.Extensions.DependencyInjection

Usage

Add the attribute to your class

Use one of the GenerateIFactory attributes to specify how your factory should be generated:

[GenerateIFactory<int>]
public class Service(int value, Dependency dependency)
{
    // ...
}

This will generate an implementation of IFactory<int, Service>, allowing you to create instances of Service with an int parameter while automatically resolving other dependencies from the DI container. FactoryGenerator provides multiple attribute variations depending on the number of parameters your factory should accept.

Register generated factories in the DI container

The RegisterGeneratedFactories() method automatically registers all factories created by the source generator.

var serviceCollection = new ServiceCollection()
    .RegisterGeneratedFactories();

Use the factory

using var serviceProvider = serviceCollection.BuildServiceProvider();

var factory = serviceProvider.GetRequiredService<IFactory<int, Service>>();

var service = factory.Create(1);

Full sample can be found here.