ServiceRegistry

Contract for service registry modules that configure an IServiceCollection. A type implementing it is added through AddService<T>, which constructs the module and calls ConfigureService.

Implementations need a public parameterless constructor, because AddService<T> constructs the module directly rather than resolving it from the container.

ConfigureService

Adds the module's registrations to the provided IServiceCollection. AddService<T> calls this after constructing the module, and application code can call it directly when it already owns an instance.

The collection passed in is the application's live one, not a copy, so registrations made here are visible to the rest of startup and there is nothing to return. Do not resolve services or perform runtime work here; this method should only describe registrations.

Program.cs

using AlmightyShogun.Utils;
using Microsoft.Extensions.DependencyInjection;

builder.Services.AddService<NotificationsRegistry>();

NotificationsRegistry.cs

using AlmightyShogun.Utils;
using Microsoft.Extensions.DependencyInjection;

public sealed class NotificationsRegistry : IServiceRegistry
{
    public void ConfigureService(IServiceCollection serviceCollection)
        => serviceCollection.AddSingleton<NotificationFormatter>();
}

NotificationFormatter.cs

public sealed class NotificationFormatter
{
    public string Format(string message) => $"Notification: {message}";
}

Type signature

public void ConfigureService(IServiceCollection serviceCollection);