Hangfire, Autofac and WebApi

question
1

I recently learned about Hangfire but had no luck with it so far. My project uses autofac so I’ve added HangFire.1.4.3 & HangFire.Autofac.1.1.0 nuget packages to my project. Followed by documentation I’ve created Startup class and registered Hangfire there

public void Configuration(IAppBuilder app)
{
      GlobalConfiguration.Configuration
                    .UseSqlServerStorage("NavigatorConnectionString");
    
       app.UseHangfireDashboard();
       app.UseHangfireServer();
}

After that I’ve updated WebApiConfig and registered my Autofac container in Hangfire

private static void RegisterDependencies(HttpConfiguration config)
{
     var builder = new ContainerBuilder();
     ...
     var container = builder.Build();
     ...
     config.DependencyResolver = new AutofacWebApiDependencyResolver(container);
     Hangfire.GlobalConfiguration.Configuration.UseAutofacActivator(container);
}

When I try to run Hangfire job like

IObject someObject = MyObject();    
var jobId = BackgroundJob.Enqueue<IMyInterface>(x
                    => x.MyMethod(someObject));

I get the following error

System.InvalidOperationException
The type MyNamespace.IMyInterface does not contain a method with signature MyMethod(IObject1)`
at Hangfire.Storage.InvocationData.Deserialize()

UPDATE: I’ve figured out that resolve doesn’t work when interface has generic declaration. Sort of
public TResult MyMethod(IObject query)

What can be the issue?

2

The issue is in hangfire way of work. It serializes parameters and in case of generics can’t desirialize it back. The workaround is create a mediator that can be easily serialized/desirialized and run the code you need.