public class ServiceResolverAdapter : System.Web.Http.Services.IDependencyResolver
    {
        private readonly System.Web.Mvc.IDependencyResolver dependencyResolver;

        public ServiceResolverAdapter(System.Web.Mvc.IDependencyResolver dependencyResolver)
        {
            if (dependencyResolver == null) throw new ArgumentNullException("dependencyResolver");
            this.dependencyResolver = dependencyResolver;
        }

        public object GetService(Type serviceType)
        {
            return dependencyResolver.GetService(serviceType);
        }

        public IEnumerable<object> GetServices(Type serviceType)
        {
            return dependencyResolver.GetServices(serviceType);
        }
    }

    public static class ServiceResolverExtensions
    {
        public static System.Web.Http.Services.IDependencyResolver ToServiceResolver(this System.Web.Mvc.IDependencyResolver dependencyResolver)
        {
            return new ServiceResolverAdapter(dependencyResolver);
        }
    }