Problem in registering IHubContext<,> in Grace IOC

[shahabganji]

Question on stackoverflow

I have a 2.2 .net core application, using SignalR core, in one of my Controllers I want to inject IHubContext<ChatHub, IChatClient>. Works pretty well with built-in IoC, but when I add Grace IoC I get the following error message:

Unable to resolve service for type 'Microsoft.AspNetCore.SignalR.IHubContext`2[Test.Hubs.ChatHub,Test.Hubs.IChatClient]' while attempting to activate TestController

I tried to add the following line in the ConfigureContainer method:

scope.Configure(c=> c.Export<IHubContext<ChatHub, IChatClient>>());

Also tried:

scope.Configure(c=> { c.Export(typeof(IHubContext<,>)); });

Then the error changed to the following which sounds reasonable since I haven't registered a concrete class for the interface.

Could not find public constructor on type Microsoft.AspNetCore.SignalR.IHubContext`2[[Test.Hubs.ChatHub, Test, Version=0.0.1.0, Culture=neutral, PublicKeyToken=null],[Test.Hubs.IChatClient, Test, Version=0.0.1.0, Culture=neutral, PublicKeyToken=null]]

And BTW, I've tested aforementioned approaches with both
.UseGrace((new InjectionScopeConfiguration { AutoRegisterUnknown = true })) and .UseGrace((new InjectionScopeConfiguration { AutoRegisterUnknown = false })).

Grace.AspNetCore.MVC and Grace.AspNetCore.Hosting packages are installed.

Anything that I missed?

[silkfire]

I think you need to add scope.SetupMvc() in order for Grace to correctly perform injection on your controllers.

[shahabganji]

I testes that as well but to no avail.

Program.cs

// omitted code
WebHost.CreateDefaultBuilder(args)
.UseGrace((new InjectionScopeConfiguration { AutoRegisterUnknown = false }));

Startup.cs

 public void ConfigureContainer(IInjectionScope scope)
        {
            scope.SetupMvc();
        }

Got the following error

An unhandled exception has occurred while executing the request.
System.ArgumentNullException: Value cannot be null.
Parameter name: instance
   at Microsoft.Extensions.Internal.PropertyActivator`1.Activate(Object instance, TContext context)
   at Microsoft.AspNetCore.Mvc.Internal.DefaultControllerPropertyActivator.<>c__DisplayClass5_0.<GetActivatorDelegate>g__Activate|0(ControllerContext controllerContext, Object controller)
   at Microsoft.AspNetCore.Mvc.Controllers.ControllerFactoryProvider.<>c__DisplayClass5_0.<CreateControllerFactory>g__CreateController|0(ControllerContext controllerContext)
   at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
   at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.InvokeInnerFilterAsync()
   at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeNextResourceFilter()
   at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.Rethrow(ResourceExecutedContext context)
   at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
   at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeFilterPipelineAsync()
   at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeAsync()
   at Microsoft.AspNetCore.Routing.EndpointMiddleware.Invoke(HttpContext httpContext)
   at Microsoft.AspNetCore.Routing.EndpointRoutingMiddleware.Invoke(HttpContext httpContext)
   at Microsoft.AspNetCore.Builder.RouterMiddleware.Invoke(HttpContext httpContext)
   at Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware.Invoke(HttpContext context)

__ EDIT __

And with

.UseGrace((new InjectionScopeConfiguration { AutoRegisterUnknown = true }));

Got this one:

An unhandled exception has occurred while executing the request.
Grace.DependencyInjection.Exceptions.LocateException: Could not locate Type Microsoft.AspNetCore.SignalR.IHubContext`2[Test.Hubs.ChatHub,Test.Hubs.IChatClient]
1 Importing Test.Controllers.GroupsController
2 Importing Microsoft.AspNetCore.SignalR.IHubContext`2[Test.Hubs.ChatHub,Test.Hubs.IChatClient]  for constructor parameter chatHub

   at Grace.DependencyInjection.Impl.InjectionContextValueProvider.GetValueFromInjectionContext[T](IExportLocatorScope locator, StaticInjectionContext staticContext, Object key, IInjectionContext dataProvider, Object defaultValue, Boolean useDefault, Boolean isRequired) in C:\projects\grace\src\Grace\DependencyInjection\Impl\InjectionContextValueProvider.cs:line 236
   at lambda_method(Closure , IExportLocatorScope , IDisposalScope , IInjectionContext )
   at Grace.DependencyInjection.Impl.ActivationStrategyDelegateCache.FallbackExecution(ImmutableHashTree`2 currentNode, Type type, IExportLocatorScope scope, Boolean allowNull, IInjectionContext context) in C:\projects\grace\src\Grace\DependencyInjection\Impl\ActivationStrategyDelegateCache.cs:line 128
   at Grace.DependencyInjection.Impl.ActivationStrategyDelegateCache.ExecuteActivationStrategyDelegateAllowNull(Type type, IExportLocatorScope scope) in C:\projects\grace\src\Grace\DependencyInjection\Impl\ActivationStrategyDelegateCache.cs:line 78
   at Microsoft.AspNetCore.Mvc.Controllers.ControllerFactoryProvider.<>c__DisplayClass5_0.<CreateControllerFactory>g__CreateController|0(ControllerContext controllerContext)
   at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
   at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.InvokeInnerFilterAsync()
   at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeNextResourceFilter()
   at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.Rethrow(ResourceExecutedContext context)
   at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
   at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeFilterPipelineAsync()
   at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeAsync()
   at Microsoft.AspNetCore.Routing.EndpointMiddleware.Invoke(HttpContext httpContext)
   at Microsoft.AspNetCore.Routing.EndpointRoutingMiddleware.Invoke(HttpContext httpContext)
   at Microsoft.AspNetCore.Builder.RouterMiddleware.Invoke(HttpContext httpContext)
   at Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware.Invoke(HttpContext context)

[ipjohnson]

Hi @shahabganji

Could you put together a small sample of it not working and I can take a look. What it sounds like is there is a registration that's not being added to Grace but is to the default container (not sure how that happens).

I've not worked with SignalR before so I'm not 100% sure what's wrong.

[silkfire]

I assume you've added this as well to your code to activate SignalR?

app.UseSignalR(routes => routes.MapHub<MyHubType>("/hub-endpoint"));

[shahabganji]

Hi @ipjohnson, yes sure I'll try to reproduce the problem in a repository and I will share the link here.

@silkfire your assumption is correct.

[shahabganji]

@ipjohnson here you could find a sample repo.

Just one thing to note, due to this I thought that version 7.1 might be only for .net core 3.0, however, I tested the above-mentioned repo with both versions 6.4 and 7.1.

[ipjohnson]

@shahabganji sorry it's taken me so long to get to this I've been swamped with life stuff.

When I open this project it fails to load with this exception

'C:\Users\ijohnson\Documents\Visual Studio 2019\Projects\GraceSignalRSample-master\GraceSignalRSample\GraceSignalRSample.csproj : error : One or more errors occurred.'

[shahabganji]

@ipjohnson

Don't be, take your time.

I created the project on my Mac, but I get the same error on windows too; 😩 let me check it first.

[shahabganji]

@ipjohnson

It should be OK now, just needed to remove global.json file 🙈

[ipjohnson]

So I took a look and there is a bug in the way the generic type is being constructed (or not constructed as the case is). I'm going to try and address this issue and a couple others this weekend.

[ipjohnson]

I have one more issue I need to address before I can do a beta release but you can test the fix in the nightly nuget feed

https://ci.appveyor.com/nuget/grace-master

[shahabganji]

@ipjohnson

Thanks for your great support. Unfortunately, my laptop is broken and I cannot test it until I get it repaired. however, as soon as I have my machine I will test and report the results. 🙏