progrAmmar progrAmmar - 1 month ago 10
C# Question

How do I resolve Web API controllers using Autofac in a mixed Web API and MVC application?

Hi I have an MVC application where I have defined some dependencies to my Web API.

public class AutofacWebApiDependenceResolver : IDependencyResolver
{
private readonly IComponentContext container;
public AutofacWebApiDependenceResolver(IContainer container)
{

if (container == null)
{
throw new ArgumentNullException("container");
}
this.container = container;
}

public object GetService(Type serviceType)
{
if (serviceType == null)
{
throw new ArgumentNullException("serviceType");
}
var ret = this.container.ResolveOptional(serviceType) ;
return ret;
}
public IEnumerable<object> GetServices(Type serviceType)
{
if (serviceType == null)
{
throw new ArgumentNullException("serviceType");
}
Type enumerableType = typeof(IEnumerable<>).MakeGenericType(serviceType);
var ret = (IEnumerable<object>)this.container.ResolveOptional(enumerableType);
return ret;
}
}


Then in my bootstrapper class I am calling it in Application_Start as follows:

GlobalConfiguration.Configuration.DependencyResolver = new AutofacWebApiDependenceResolver((IContainer)container);


When I debug the code, I can see there are registrations of all services with my DependencyResolver, but I am still getting the following error:


An error has occurred.Type 'WebApp.Controllers.AuthenticateController'
does not have a default constructor


Here is the code to my controller:

public class AuthenticateController : ApiController
{
private readonly IFormsAuthenticationService formsAuthenticationService;
private readonly IMemberShipProvider memberShip;
private readonly IDataService dataService;

public AuthenticateController(
IMemberShipProvider memberShip,
IFormsAuthenticationService formsAuthenticationService, IDataService dataService)
{
this.memberShip = memberShip;
this.formsAuthenticationService = formsAuthenticationService;
this.dataService= dataService;
}

}


How can I bring parameters to the api controllers. The Simple controllers are working fine.

Answer

nemesv's guidance did the trick

builder.RegisterApiControllers(Assembly.GetExecutingAssembly())

Calling builder.RegisterApiControllers before calling builder.Build()

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