Hi,

I'm trying to develop a extension for Umbraco. I inject via dependency injection (Autofac) a service in the tree controller.

It works fine until I go to the second level. Umbraco will create an instance from RaceTreeController by using the default constructor…

Error message:

Received an error from the server
Failed to retrieve data for child nodes undefined

Type 'Indegrade.Autoface.BackOffice.Controllers.RaceTreeController' does not have a default constructor

EXCEPTION DETAILS:

System.ArgumentException: Type 'Indegrade.Autoface.BackOffice.Controllers.RaceTreeController' does not have a default constructor
STACKTRACE:

at System.Linq.Expressions.Expression.New(Type type)
   at System.Web.Http.Internal.TypeActivator.Create[TBase](Type instanceType)
   at System.Web.Http.Dispatcher.DefaultHttpControllerActivator.GetInstanceOrActivator(HttpRequestMessage request, Type controllerType, Func`1& activator)
   at System.Web.Http.Dispatcher.DefaultHttpControllerActivator.Create(HttpRequestMessage request, HttpControllerDescriptor controllerDescriptor, Type controllerType)

Autofac configuration

public void OnApplicationStarted(UmbracoApplicationBase umbracoApplication, ApplicationContext applicationContext)
{
    var assemblies = GetApplicationAssemblies().ToList();
    BootAutofac(assemblies);
}

private static void BootAutofac(IEnumerable<Assembly> assemblies)
{
    var builder = new ContainerBuilder();
    builder.RegisterControllers(assemblies.ToArray());

    builder.RegisterAssemblyTypes(assemblies.ToArray())
        .Where(t => t.Name.EndsWith("Service"))
        .AsImplementedInterfaces();

    builder.RegisterApiControllers(typeof (ApplicationTreeController).Assembly);
    builder.RegisterApiControllers(typeof (RaceTreeController).Assembly);

    DependencyResolver.SetResolver(new AutofacDependencyResolver(builder.Build()));
}

private static IEnumerable<Assembly> GetApplicationAssemblies()
{
    IEnumerable<Assembly> assemblies = AppDomain.CurrentDomain.GetAssemblies();
    if (HostingEnvironment.InClientBuildManager)
    {
        assemblies = assemblies.Union(BuildManager.GetReferencedAssemblies().Cast<Assembly>()).Distinct();
    }

    return assemblies.Where(assembly => assembly.GetName().Name.Contains("Indegrade"));
}

RaceTreeController

[PluginController("Mayhem")]
[Tree("mayhem", "race", "Races", "icon-message", "icon-message", true, 5)]
public class RaceTreeController : TreeController
{
    private readonly IRaceService _raceService;

    public RaceTreeController(IRaceService raceService)
    {
        _raceService = raceService;
    }

Demo

I put a little demo together. There is a Umbraco V7 site in the solution the credentials are as follows: Username: admin, Password: admin

https://bitbucket.org/stevoknievo/umbracoautofacetest

Our help would be greatly appreciated, Thanks Stefan