问使用AutofacWebApiDependencyResolver和WebAPI 2.1发布

EN

DependencyResolver.Current

GlobalConfiguration.Configuration.DependencyResolver.GetService(typeof(IXXX))

        var config = new HttpConfiguration();

        config.MapHttpAttributeRoutes();

        config.Routes.MapHttpRoute(
          name: "DefaultApi",
          routeTemplate: "api/{controller}/{action}/{id}",
          defaults: new { id = RouteParameter.Optional }
          );

        config.SuppressDefaultHostAuthentication();
        config.Filters.Add(new HostAuthenticationFilter(OAuthDefaults.AuthenticationType));

        var builder = new ContainerBuilder();
        builder.RegisterApiControllers(Assembly.GetExecutingAssembly());
        builder.RegisterType<XXX>().As<IXXX>().InstancePerRequest();

        var container = builder.Build();

        //I've tried  both approached here!
        GlobalConfiguration.Configuration.DependencyResolver = new AutofacWebApiDependencyResolver(container); 
        config.DependencyResolver = new AutofacWebApiDependencyResolver(container);
        app.UseAutofacMiddleware(container);
        app.UseAutofacWebApi(webApiConfig);
        app.UseWebApi(webApiConfig);

public class SimpleAuthorizationServerProvider : OAuthAuthorizationServerProvider
{
    public SimpleAuthorizationServerProvider(string publicClientId)
    {
        if (publicClientId == null)
            throw new ArgumentNullException("publicClientId");
        _publicClientId = publicClientId;
    }

    public IXXX XXX
    {
        get { return (IXXX)(_xxx??GlobalConfiguration.Configuration.DependencyResolver.GetService(typeof(IXXX))); }
        set { _xxx= value; }
    }

    public override async Task GrantResourceOwnerCredentials(OAuthGrantResourceOwnerCredentialsContext context)
    {
        //Dependency IXXX used here
    }

    private readonly string _publicClientId;
    private IXXX _xxx;
}