Structuremap No parameterless constructor defined for this object - asp.net-mvc

Question

I'm a newbie to StructureMap, and I've been trying to fix that error for some time now.
Just can't figure out how to fix it and where am I doing wrong.
I even set up a template MVC4 site, with nothing in it and still getting that error.
Can someone please help me out ?
public static class IoC {
public static IContainer Initialize() {
ObjectFactory.Initialize(x =>
{
x.Scan(scan =>
{
scan.TheCallingAssembly();
scan.WithDefaultConventions();
});
x.For<IDbSession>().Use(() => MvcApplication.DbSession);
x.For<IDbService>().Use<DbService>();
});
return ObjectFactory.Container;
}
}
public class HomeController : Controller
{
protected readonly IDbService _dbService;
public HomeController(IDbService dbService)
{
_dbService = dbService;
}
...
}
public interface IDbSession : IDisposable
{
void Commit();
void Rollback();
}
public interface IDbService
{
StudentsService Students { get; }
CoursesService Courses { get; }
...
}
public class DbService : IDbService
{
private readonly IDbSession _dbSession;
public StudentsService Students { get; }
public CoursesService Courses { get; }
...
public DbService(IDbSession dbSession)
{
_dbSession = dbSession;
}
}
public class MvcApplication : System.Web.HttpApplication
{
private static readonly string _connectionString;
private static readonly IDbSessionFactory _dbSessionFactory;
public static IDbSession DbSession
{
get { return (IDbSession)HttpContext.Current.Items["Current.DbSession"]; }
private set { HttpContext.Current.Items["Current.DbSession"] = value; }
}
static MvcApplication()
{
_connectionString= ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;
_dbSessionFactory = new DbSessionFactory(_connectionString);
}
protected MvcApplication()
{
BeginRequest += delegate
{
DbSession = _dbSessionFactory.Create();
};
EndRequest += delegate
{
if (DbSession != null)
DbSession.Dispose();
};
}
protected void Application_Start()
{
AreaRegistration.RegisterAllAreas();
WebApiConfig.Register(GlobalConfiguration.Configuration);
FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
RouteConfig.RegisterRoutes(RouteTable.Routes);
BundleConfig.RegisterBundles(BundleTable.Bundles);
AuthConfig.RegisterAuth();
}
}

Answer 1

You must configure the dependency resolver to handle parameters in a Controller's constructor. You can find out here how: http://ardalis.com/How-Do-I-Use-StructureMap-with-ASP.NET-MVC-3