Error resolving IHubContext<,> in ASP.NET Core

[cd21h]

Not 100% sure if should go to Autofac.Core or here.

Getting this exception when resolving SiglanR IHubContext<Hub,IClient>, resolving IHubContext<Hub> works fine.

If .ConfigureServices(services => services.AddAutofac()) is commented out, both services can be resolved. Everything works fine if I use MS dependency Injection.

• ASP,NET Core 2.1
• Autofac 4.9.3
• Autofac.Extensions.DependencyInjection 4.4.0

Steps to reproduce

Download and run attached example.

Exception

System.InvalidOperationException
  HResult=0x80131509
  Message=This operation is only valid on generic types.
  Source=System.Private.CoreLib
  StackTrace:
   at System.RuntimeType.GetGenericTypeDefinition()
   at Autofac.Util.TypeExtensions.ParameterCompatibleWithTypeConstraint(Type parameter, Type constraint)
   at Autofac.Util.TypeExtensions.<>c__DisplayClass7_1.<IsCompatibleWithGenericParameterConstraints>b__1(Type constraint)
   at System.Linq.Enumerable.Any[TSource](IEnumerable`1 source, Func`2 predicate)
   at Autofac.Util.TypeExtensions.IsCompatibleWithGenericParameterConstraints(Type genericTypeDefinition, Type[] parameters)
   at Autofac.Features.OpenGenerics.OpenGenericServiceBinder.TryBindServiceType(Service service, IEnumerable`1 configuredOpenGenericServices, Type openGenericImplementationType, Type& constructedImplementationType, Service[]& constructedServices)
   at Autofac.Features.OpenGenerics.OpenGenericRegistrationSource.<RegistrationsFor>d__3.MoveNext()
   at Autofac.Core.Registration.ComponentRegistry.GetInitializedServiceInfo(Service service)
   at Autofac.Core.Registration.ComponentRegistry.TryGetRegistration(Service service, IComponentRegistration& registration)
   at Autofac.ResolutionExtensions.TryResolveService(IComponentContext context, Service service, IEnumerable`1 parameters, Object& instance)
   at Autofac.ResolutionExtensions.ResolveService(IComponentContext context, Service service, IEnumerable`1 parameters)
   at Autofac.ResolutionExtensions.Resolve[TService](IComponentContext context, IEnumerable`1 parameters)
   at SignalRTest1.Startup.ConfigureServices(IServiceCollection services) in D:\Temp\AutofacIssue\Startup.cs:line 41

AutofacIssue.zip

[alsami]

Hi @Shatl,

this bug has already been fixed by @alistairjevans in the Autofac repository . Only version 4.9.3 is affected from that. Until we have released a new version of Autofac downgrading to 4.9.2 fixes the issue.

[cd21h]

Thanks @alsami