Microsoft.AspNetCore.SignalR.Hubs.ReflectedHubDescriptorProvider.BuildHubsCache C# (CSharp) Method

        protected IDictionary<string, HubDescriptor> BuildHubsCache()
        {
            // Getting all IHub-implementing types that apply
            var types = _locator.GetAssemblies()
                                .SelectMany(GetTypesSafe)
                                .Where(IsHubType);

            // Building cache entries for each descriptor
            // Each descriptor is stored in dictionary under a key
            // that is it's name or the name provided by an attribute
            var hubDescriptors = types
                .Select(type => new HubDescriptor
                                {
                                    NameSpecified = (type.GetHubAttributeName() != null),
                                    Name = type.GetHubName(),
                                    HubType = type
                                });

            var cacheEntries = new Dictionary<string, HubDescriptor>(StringComparer.OrdinalIgnoreCase);

            foreach (var descriptor in hubDescriptors)
            {
                HubDescriptor oldDescriptor = null;
                if (!cacheEntries.TryGetValue(descriptor.Name, out oldDescriptor))
                {
                    cacheEntries[descriptor.Name] = descriptor;
                }
                else
                {
                    throw new InvalidOperationException(
                        String.Format(CultureInfo.CurrentCulture,
                            Resources.Error_DuplicateHubNames,
                            oldDescriptor.HubType.AssemblyQualifiedName,
                            descriptor.HubType.AssemblyQualifiedName,
                            descriptor.Name));
                }
            }

            return cacheEntries;
        }