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Autofac and ASP.NET Web API ApiController

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悲&欢浪女
悲&欢浪女 2021-02-08 15:57

I have been using autofac with MVC 3 for a while and love it. I recently upgraded a project to MVC 4 and everything seems to be working except for Web Api ApiControllers. I am g

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  • 轮回少年
    轮回少年 (楼主)
    2021-02-08 16:40

    I just configured this on one of my apps. There are different ways of doing it but I like this approach:

    Autofac and ASP.NET Web API System.Web.Http.Services.IDependencyResolver Integration

    First I created a class which implements System.Web.Http.Services.IDependencyResolver interface.

    internal class AutofacWebAPIDependencyResolver : System.Web.Http.Services.IDependencyResolver {

    private readonly IContainer _container;

    public AutofacWebAPIDependencyResolver(IContainer container) {

        _container = container;
    }

    public object GetService(Type serviceType) {

        return _container.IsRegistered(serviceType) ? _container.Resolve(serviceType) : null;
    }

    public IEnumerable GetServices(Type serviceType) {

        Type enumerableServiceType = typeof(IEnumerable<>).MakeGenericType(serviceType);
        object instance = _container.Resolve(enumerableServiceType);
        return ((IEnumerable)instance).Cast();
    }
}



    And I have another class which holds my registrations:
    


    internal class AutofacWebAPI {

    public static void Initialize() {
        var builder = new ContainerBuilder();
        GlobalConfiguration.Configuration.ServiceResolver.SetResolver(
            new AutofacWebAPIDependencyResolver(RegisterServices(builder))
        );
    }

    private static IContainer RegisterServices(ContainerBuilder builder) {

        builder.RegisterAssemblyTypes(typeof(MvcApplication).Assembly).PropertiesAutowired();

        builder.RegisterType().As();
        builder.RegisterType().As();

        return
            builder.Build();
    }
}

    


    Then, initialize it at Application_Start:
    


    protected void Application_Start() {

    //...

    AutofacWebAPI.Initialize();

    //...
}

    


    I hope this helps.
    
    
    
             
    
                                                        
    
            
            
    
              
                
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