DependencyInjection.SourceGenerator.Microsoft 1.4.0

DependencyInjection.SourceGenerator.Microsoft

Register services using attributes instead of registering in code.

Usage

Add the "Register" attribute to the class you want to register. The attribute takes a type and a lifetime. The type is the type you want to register and the lifetime is the lifetime of the service. The lifetime is optional and defaults to Transient.

To use this library you need to install the source generator package and the contacts package. The source generator package is a development dependency and will not be exposed as a dependency to consumers of your projects, while the contracts package contains the attributes and enums used to configure the generator.

namespace RootNamespace.Services;

public interface IExampleService
{
	string GetExample();
}

public interface IAnotherService
{
	string GetAnother();
}

[Register(ServiceName = "ServiceName", Lifetime = Lifetime.Singleton)]
public class ExampleService : IExampleService
{
	public string GetExample()
	{
		return "Example";
	}
}

[Decorate]
public class KeyedService : IExampleService
{
	public string GetExample()
	{
		return "Keyed";
	}
}

[Decorator]
public class ServiceDecorator : IExampleService
{
	private readonly IExampleService _exampleService;

	public ServiceDecorator(IExampleService exampleService)
	{
		_exampleService = exampleService;
	}

	public string GetExample()
	{
		return _exampleService.GetExample();
	}
}

[Register<IAnotherService>]
public class MultipleInterfacesService : IExampleService, IAnotherService
{
	public string GetExample()
	{
		return "MultipleInterfaces";
	}

	public string GetAnother()
	{
		return "Another";
	}
}

Generates a class ServiceCollectionExtensions Assuming the project is named MyProject, the generated method will be named AddMyProject.

// <auto-generated/>
#pragma warning disable
#nullable enable
namespace RootNamespace;
using global::Microsoft.Extensions.DependencyInjection;

[global::System.Diagnostics.CodeAnalysis.ExcludeFromCodeCoverage]
public static class ServiceCollectionExtensions
{
    public static global::Microsoft.Extensions.DependencyInjection.IServiceCollection AddMyProject(this global::Microsoft.Extensions.DependencyInjection.IServiceCollection services)
    {
        services.AddKeyedSingleton<global::RootNamespace.Services.IExampleService, global::RootNamespace.Services.ExampleService>("ServiceName");
        services.Decorate<global::RootNamespace.Services.IExampleService, global::RootNamespace.Services.ServiceDecorator>();
        services.AddTransient<global::RootNamespace.Services.IAnotherService, global::RootNamespace.Services.MultipleInterfacesService>();
        return services;
    }
}

This can then be used like this:

var services = new ServiceCollection();
services.AddMyProject();

for AspNetCore web APIs:

public void ConfigureServices(IServiceCollection services)
{
	services.AddMyProject();
}

and for minimal APIs:

var builder = WebApplication.CreateBuilder(args);
builder.Services.AddMyProject();

You can also create a method that will be called by the AddMyProject method. This is useful if you want to register services from other libraries

using global::DependencyInjection.SourceGenerator.Contracts.Attributes;

namespace DependencyInjection.SourceGenerator.Microsoft.Demo;

public class Registrator
{
    [RegistrationExtension]
    internal static void Register(global::Microsoft.Extensions.DependencyInjection.IServiceCollection services)
    {
		// Register your additional services here
    }
}

This will then produce the following code:

public static class ServiceCollectionExtensions
{
    public static global::Microsoft.Extensions.DependencyInjection.IServiceCollection AddTestProject(this global::Microsoft.Extensions.DependencyInjection.IServiceCollection services)
    {
        global::DependencyInjection.SourceGenerator.Microsoft.Demo.Registrator.Register(services);
        return services;
    }
}

Register all services in the project

You can also register all services in an project by adding the RegisterAll attribute to the assembly. This will register all implementations of the specified type.

using DependencyInjection.SourceGenerator.Contracts.Attributes;

[assembly: RegisterAll<IExampleService>]

namespace RootNamespace.Services;

public interface IExampleService
{
	string GetExample();
}

public class ExampleService1 : IExampleService
{
	public string GetExample()
	{
		return "Example 1";
	}
}

public class ExampleService2 : IExampleService
{
	public string GetExample()
	{
		return "Example 2";
	}
}

this will generate the following code:

public static class ServiceCollectionExtensions
{
	public static global::Microsoft.Extensions.DependencyInjection.IServiceCollection AddTestProject(this global::Microsoft.Extensions.DependencyInjection.IServiceCollection services)
	{
		services.AddTransient<global::RootNamespace.Services.IExampleService, global::RootNamespace.Services.ExampleService1>();
		services.AddTransient<global::RootNamespace.Services.IExampleService, global::RootNamespace.Services.ExampleService2>();
		return services;
	}
}

Lifetime

The lifetime is an enum with the following values:

• Transient
• Scoped
• Singleton