Howto get injection working with Topshelf, Autofac and self hosted Owin - asp.net-web-api2

Question

No matter what i do i cannot get injection working with Topshelf, Autofac and self hosted Owin.
I have followed the documentation in http://autofac.readthedocs.org/en/latest/integration/webapi.html#owin-integration and read Autofac WebApi 2 OWIN Not Working, but I am still unable to inject a simple class into my apicontroller.
The 'almost' complete app is posted here.
No matter what i do I cannot get an IEmail instance injected into the EmailController. Can anyone suggest a solution
// topshelf startup code
class Program
{
static void Main(string[] args)
{
HostFactory.Run(c =>
{
//c.UseAutofacContainer(container);
c.RunAsNetworkService();
c.Service<SampleService>(s =>
{
s.ConstructUsing(name => new SampleService());
s.WhenStarted((service, control) => service.Start());
s.WhenStopped((service, control) => service.Stop());
});
});
}
}
// lifted from http://autofac.readthedocs.org/en/latest/integration/webapi.html#owin-integration
public class StartupConfig
{
public void Configure(IAppBuilder appBuilder)
{
var config = new HttpConfiguration();
config.MapHttpAttributeRoutes(); // using attribute based routing because I prefer it
var builder = new Autofac.ContainerBuilder(); // Create the container builder.
builder.RegisterApiControllers(Assembly.GetExecutingAssembly()); // Register the Web API controllers.
builder.RegisterWebApiFilterProvider(config); // optional
builder.RegisterType<Email>().As<IEmail>().InstancePerRequest();
var container = builder.Build();
config.DependencyResolver = new AutofacWebApiDependencyResolver(container);
appBuilder.UseAutofacMiddleware(container);
appBuilder.UseAutofacWebApi(config); // Make sure the Autofac lifetime scope is passed to Web API.
appBuilder.UseWebApi(config); // enable web-api
string filedir = Path.Combine(Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location), "../../web");
appBuilder.UseFileServer(new FileServerOptions
{
EnableDefaultFiles = true,
DefaultFilesOptions =
{
DefaultFileNames = new[] { "Index.html" }
},
EnableDirectoryBrowsing = true,
FileSystem = new PhysicalFileSystem(filedir),
});
}
}
// topshelf hosted service to start
public class SampleService
{
public bool Start()
{
if (WebApplication == null)
{
WebApplication = WebApp.Start
(
new StartOptions
{
Port = 1234
},
appBuilder =>
{
new StartupConfig().Configure(appBuilder);
}
);
}
return true;
}
public bool Stop()
{
return true;
}
protected IDisposable WebApplication
{
get;
set;
}
}
// sample controller
public class EmailController : ApiController
{
public IEmail MyModel; /** always NULL **/
[HttpGet]
[Route("api/emails/{id}")]
public IHttpActionResult get(int id)
{
}
}
Nuget packages
<packages>
<package id="Autofac" version="3.5.0" targetFramework="net452" />
<package id="Autofac.Owin" version="3.1.0" targetFramework="net452" />
<package id="Autofac.WebApi" version="3.1.0" targetFramework="net452" />
<package id="Autofac.WebApi2" version="3.4.0" targetFramework="net452" />
<package id="Autofac.WebApi2.Owin" version="3.3.0" targetFramework="net452" />
<package id="EntityFramework" version="6.0.0" targetFramework="net452" />
<package id="Microsoft.AspNet.WebApi.Client" version="5.2.2" targetFramework="net45" />
<package id="Microsoft.AspNet.WebApi.Core" version="5.2.2" targetFramework="net45" />
<package id="Microsoft.AspNet.WebApi.Owin" version="5.2.2" targetFramework="net45" />
<package id="Microsoft.Owin" version="3.0.1" targetFramework="net452" />
<package id="Microsoft.Owin.FileSystems" version="3.0.1" targetFramework="net452" />
<package id="Microsoft.Owin.Host.HttpListener" version="3.0.1" targetFramework="net452" />
<package id="Microsoft.Owin.Hosting" version="3.0.0" targetFramework="net45" />
<package id="Microsoft.Owin.StaticFiles" version="3.0.1" targetFramework="net452" />
<package id="Newtonsoft.Json" version="6.0.4" targetFramework="net45" />
<package id="Owin" version="1.0" targetFramework="net45" />
<package id="Topshelf" version="3.1.4" targetFramework="net45" />
<package id="Topshelf.Autofac" version="1.0.0" targetFramework="net452" />
</packages>

Answer 1

In order to inject into the apicontroller here
public class EmailController : ApiController
{
public IEmail MyModel; // <---
[HttpGet]
[Route("api/emails/{id}")]
public IHttpActionResult get(int id)
{
}
}
I was missing [PropertiesAutowired] when registering the api controller builder.RegisterApiControllers(Assembly.GetExecutingAssembly()).PropertiesAutowired();

Answer 2

You also dont have a constructor for your Api Controller. Once you have constructor, the service will resolve itself if it is in the Container.
public class EmailController : ApiController
{
public IEmail MyModel;
public EmailController(IEmail MyModel){
this.MyModel = MyModel;
}
[HttpGet]
[Route("api/emails/{id}")]
public IHttpActionResult get(int id)
{
}
}