Microsoft.AspNet.SignalR.DefaultDependencyResolver.GetService C# (CSharp) Method

        public virtual object GetService(Type serviceType)
        {
            if (serviceType == null)
            {
                throw new ArgumentNullException("serviceType");
            }

            IList<Func<object>> activators;
            if (_resolvers.TryGetValue(serviceType, out activators))
            {
                if (activators.Count == 0)
                {
                    return null;
                }
                if (activators.Count > 1)
                {
                    throw new InvalidOperationException(String.Format(CultureInfo.CurrentCulture, Resources.Error_MultipleActivatorsAreaRegisteredCallGetServices, serviceType.FullName));
                }
                return Track(activators[0]);
            }
            return null;
        }