Have you used dependency injection containers in your projects?

Yes, inversion of control (IoC) containers are widely used in C# projects for dependency management and increasing code modularity. They allow for automatic object creation and dependency injection, which simplifies testing and maintenance.

For example, ASP.NET Core has a built-in IoC container that allows registering services and retrieving them via constructor:

// Registering a service
services.AddTransient<IMyService, MyService>();

// Using dependency injection
public class MyController : Controller
{
    private readonly IMyService _myService;
    public MyController(IMyService myService)
    {
        _myService = myService;
    }
}

Additionally, there are popular third-party containers like Autofac, Ninject, and Unity, which offer extended configuration options and object lifecycle management.