Hi there,

Using this tutorial: https://our.umbraco.org/documentation/reference/using-ioc

I tried to make use of the dependency injection. After many tries i still don't get it to work. So hopefull you guys can help me out here:

let me share some code:

(Startup.cs - IApplicationEventHandler

  public class StartUp : IApplicationEventHandler
 {
  public void OnApplicationInitialized(UmbracoApplicationBase   umbracoApplication, ApplicationContext applicationContext)
 {
 }

  public void OnApplicationStarted(UmbracoApplication httpApplication,    Umbraco.Core.ApplicationContext applicationContext)
{

var builder = new ContainerBuilder();

//register all controllers found in this assembly
builder.RegisterControllers(typeof(NewsController).Assembly);
builder.RegisterApiControllers(typeof(UmbracoApplication).Assembly);
builder.RegisterApiControllers(typeof(NewsController).Assembly);
builder.RegisterControllers(Assembly.GetExecutingAssembly());
builder.RegisterType<SearcherService>().As<ISearcherService>();

//add custom class to the container as Transient instance
builder.Register(c => new SearcherService()).As<ISearcherService>().SingleInstance();

var container = builder.Build();
var resolver = new AutofacWebApiDependencyResolver(container);
DependencyResolver.SetResolver(new AutofacDependencyResolver(container));
GlobalConfiguration.Configuration.DependencyResolver = new AutofacWebApiDependencyResolver(container);

}

public void OnApplicationStarted(UmbracoApplicationBase  umbracoApplication, ApplicationContext applicationContext)
{
}

public void OnApplicationStarting(UmbracoApplicationBase       umbracoApplication, ApplicationContext applicationContext)
{
}

}    

Surface Controller:

 namespace *.Feature.News.Controllers
 {
public class NewsController : Umbraco.Web.Mvc.SurfaceController
{
    public NewsController()
    {

    }

    public NewsController(ISearcherService searcherService)
    {
        this.SearcherService = searcherService;
    }

    public ISearcherService SearcherService { get; }

    public ActionResult NewsOverview(RenderModel model)
    {
        var newsOverviewModel = new Models.NewsOverview(model.Content);
        var newsItems = this.SearcherService.SearchByNodeType("NewsSearcher", "content", "newsDetail");
        newsOverviewModel.NewsItems = newsItems.Cast<NewsDetail>().ToList();

        return this.PartialView("~/Views/NewsItems.cshtml", newsOverviewModel);
    }
}
}

SearchService.cs

public class SearcherService : ISearcherService
{
   code
}

ISearchService.cs

public interface ISearcherService
{
    IEnumerable<IPublishedContent> SearchByNodeType(string searchProvider, string section, string nodeType);
}

So the problem here is that the IsearchService is just not set.