Advanced Dependency Injection in .NET Core: Design Patterns for Scalable Applications

Dependency Injection (DI) is a cornerstone of modern software development. .NET Core’s built-in DI container provides a robust foundation for dependency management. However, in large-scale and complex applications, the standard DI patterns may not suffice. This article explores advanced design patterns such as Factory, Decorator, and Composite, integrated with .NET Core DI, to create flexible and scalable applications.

1. Factory Design Pattern with DI

The Factory Pattern abstracts object creation logic, making it ideal for scenarios involving dynamic configurations or runtime decisions. Combined with .NET Core’s DI, it becomes a powerful tool for managing dependencies.

public interface INotificationService
{
    void Notify(string message);
}

public class EmailNotificationService : INotificationService
{
    public void Notify(string message) => Console.WriteLine($"Email sent: {message}");
}

public class SmsNotificationService : INotificationService
{
    public void Notify(string message) => Console.WriteLine($"SMS sent: {message}");
}

public class NotificationFactory
{
    private readonly IServiceProvider _serviceProvider;

    public NotificationFactory(IServiceProvider serviceProvider)
    {
        _serviceProvider = serviceProvider;
    }

    public INotificationService Create(string type)
    {
        return type switch
        {
            "Email" =>…