Castle.MicroKernel.Handlers.HandlerException : Can't create component as it has dependencies to be satisfied. #12186

8 Answer(s)

• 

  0

  m.aliozkaya created one month ago

  Support Team

  Hi @Astech,

  Did you add your hub to endpoints?

  public void Configure(IApplicationBuilder app, IHostingEnvironment env)
  {
      // Other middleware...
      app.UseEndpoints(endpoints =>
      {
          endpoints.MapHub<DocumentHub>("/documentHub");
      });
  }
  

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• 

  0

  Astech created one month ago

  Hi,

  Yes I already have it added in my startup. The other ones don't seem to be erroring.

          app.UseEndpoints(endpoints =>
          {
              endpoints.MapHub<AbpCommonHub>("/signalr");
              endpoints.MapHub<ChatHub>("/signalr-chat");
              endpoints.MapHub<AgendaHub>("/signalr-agenda");
              endpoints.MapHub<MinuteHub>("/signalr-minute");
              endpoints.MapHub<DocumentHub>("/signalr-document-conversion");
          });
  

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• 

  0

  m.aliozkaya created one month ago

  Support Team

  Hi @Astech,

  Could you share your DocumentHub.cs?

  Also, you can check for this document. https://aspnetboilerplate.com/Pages/Documents/SignalR-Integration

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• 

  0

  Astech created one month ago

  Hi,

  using Microsoft.AspNetCore.SignalR;
  
  namespace Congresso.Documents
  {
      public class DocumentHub : Hub
      {
      }
  }
  

  I did check the link to ensure that the necessary packages are also installed.

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• 

  0

  m.aliozkaya created one month ago

  Support Team

  Hi @Astech,

  You can add dependency with following interface.

  using Microsoft.AspNetCore.SignalR;
  
  namespace Congresso.Documents
  {
      public class DocumentHub : Hub, ITransientDependency
      {
      }
  }
  

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• 

  0

  Astech created one month ago

  Seems to be an issue when trying to write & run tests (in the .Test project), that access services that use a hub

  I'm assuming the startup.cs from the MVC project does not get run when the tests run so how can we ensure these dependencies are registered within the .Test project in the same way they are within the .Mvc project like below:

  app.UseEndpoints(endpoints =>
          {
              endpoints.MapHub<AbpCommonHub>("/signalr");
              endpoints.MapHub<ChatHub>("/signalr-chat");
              endpoints.MapHub<AgendaHub>("/signalr-agenda");
              endpoints.MapHub<MinuteHub>("/signalr-minute");
              endpoints.MapHub<DocumentHub>("/signalr-document-conversion");
          });
  

  There appears to be no startup.cs file in the .Test project to try the same code. Trying to register the Hub in the same way as we register services in the test project:

  public Security_Tests()
  {
      _documentHub = Resolve<IHubContext<DocumentHub>>();
      _documentsAppService = Resolve<IDocumentsAppService>(); // Service that uses the DocumentHub
  }
  

  Results in:

  Abp.AbpException : Can not register IHubContext`1. It should be a non-abstract class. If not, it should be registered before.
  

  Many thanks

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• 

  0

  m.aliozkaya created one month ago

  Support Team

  Hi @Astech,

  You can mock your DocumentHub for unit testing.

  _documentHub = Substitute.For<IHubContext<DocumentHub>>();

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• 

  0

  Astech created one month ago

  Many thanks m.aliozkaya

  This has resolved the issue. To help anyone else, this is the complete code segment for unit testing an app service that utilies SignalR:

  var fakeDocumentHub = Substitute.For<IHubContext<DocumentHub>>();
  LocalIocManager.IocContainer.Register(Component.For<IHubContext<DocumentHub>>().Instance(fakeDocumentHub).IsDefault());
  var _documentsAppService = Resolve<IDocumentsAppService>();
  

  Do this to get the service instance instead of using Dependency Injection in the unit test class itself.

  Thanks again m.aliozkaya

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  1