Htykuut

I'm having a problem activating instance of my class with no parametless constructor defined.

The constructor:

public HangfireExecutor(ICommandDispatcher commandDispatcher, IQueryDispatcher queryDispatcher, IMapper mapper)

How I register and configure Hangfire (three dots are used instead of sensitive info):

[assembly: OwinStartupAttribute(typeof(Web2.Startup))]

    public partial class Startup



    private IAppBuilder _app;

    public void Configuration(IAppBuilder app)

    {

        ConfigureAuth(app);

        _app = app;



        GlobalConfiguration.Configuration.UseSqlServerStorage("...");



        _app.UseHangfireDashboard("/...", new DashboardOptions

        {

            Authorization = new { new HangfireDashboardAuthorizationFilter() },

            AppPath = "/Identity/Create"

        });



        _app.UseHangfireServer();



        _app.UseNinjectMiddleware(CreateKernel);

    }

Registration in IoC container:

public partial class Startup

{

...

protected IKernel CreateKernel()

{

    var kernel = new StandardKernel();

    ...

    kernel.Bind<HangfireExecutor>().ToSelf().InBackgroundJobScope();

    GlobalConfiguration.Configuration.UseNinjectActivator(kernel);

    return kernel;

The error:

System.MissingMethodException

No parameterless constructor defined for this object hangfire ninject System.RuntimeTypeHandle.CreateInstance

System.MissingMethodException: No parameterless constructor defined for this object

at System.RuntimeTypeHandle.CreateInstance(RuntimeType type, Boolean publicOnly, Boolean noCheck, Boolean& canBeCached, RuntimeMethodHandleInternal& ctor, Boolean& bNeedSecurityCheck)

at System.RuntimeType.CreateInstanceSlow(Boolean publicOnly, Boolean skipCheckThis, Boolean fillCache, StackCrawlMark& stackMark)

at System.RuntimeType.CreateInstanceDefaultCtor(Boolean publicOnly, Boolean skipCheckThis, Boolean fillCache, StackCrawlMark& stackMark)

at System.Activator.CreateInstance(Type type, Boolean nonPublic)

at System.Activator.CreateInstance(Type type)

at Hangfire.JobActivator.ActivateJob(Type jobType)

at Hangfire.JobActivator.SimpleJobActivatorScope.Resolve(Type type)

at Hangfire.Server.CoreBackgroundJobPerformer.Perform(PerformContext context)

For me it looks like the Hangfire does not use Ninject activator (?) but I don't know why.

I've followed both tutorials: on Hangfire site and Hangfire.Ninject github and several github repos and SO questions.

Instatiating other classes not used by Hangfire works well; also instatiating Hangfire executor with parametless constructor works properly.

I'm using:

• ASP .NET MVC 5


• .NET Framework 4.6.1,


• Hangfire 1.6.21


• Hangfire.Ninject 1.2

As method _app.UseNinjectMiddleware(CreateKernel); does not create kernel (just keeps delegate to the metod creating the kernel) the correct order of commands in Hangfire configuration in my case should be:

public void Configuration(IAppBuilder app)

    {

        ConfigureAuth(app);

        _app = app;



        GlobalConfiguration.Configuration.UseSqlServerStorage("...");



        _app.UseHangfireDashboard("/...", new DashboardOptions

        {

            Authorization = new { new HangfireDashboardAuthorizationFilter() },

            AppPath = "/Identity/Create"

        });



        _app.UseNinjectMiddleware(CreateKernel);

    }

and then at the end of CreateKernel method:

kernel.Bind<HangfireExecutor>().ToSelf().InBackgroundJobScope();



        GlobalConfiguration.Configuration.UseNinjectActivator(kernel);



        _app.UseHangfireServer();



        return kernel;

Now Hangfire started resolving dependencies. I think that it is important to create kernel as soon after starting the app as possible - otherwise Hangfire may not be initialized and background jobs will not be executed.