Microsoft.AspNetCore.SignalR.Hubs.HubManagerExtensions.EnsureHub C# (CSharp) Method

        public static HubDescriptor EnsureHub(this IHubManager hubManager, string hubName, params IPerformanceCounter[] counters)
        {
            if (hubManager == null)
            {
                throw new ArgumentNullException("hubManager");
            }

            if (String.IsNullOrEmpty(hubName))
            {
                throw new ArgumentNullException("hubName");
            }

            if (counters == null)
            {
                throw new ArgumentNullException("counters");
            }

            var descriptor = hubManager.GetHub(hubName);

            if (descriptor == null)
            {
                for (var i = 0; i < counters.Length; i++)
                {
                    counters[i].Increment();
                }
                throw new InvalidOperationException(String.Format(CultureInfo.CurrentCulture, Resources.Error_HubCouldNotBeResolved, hubName));
            }

            return descriptor;
        }