解决.NETCoreStartup中的Hangfire依赖关系/HttpContext问题

我在.NET Core Web应用程序的Startup类中安装并配置了Hangfire,如下所示(删除了很​​多非Hangfire代码):

public class Startup
{
    public void Configuration(IAppBuilder app)
    {
        app.UseHangfireServer();
        //app.UseHangfireDashboard();
        //RecurringJob.AddOrUpdate(() => DailyJob(), Cron.Daily);
    }

    public IServiceProvider ConfigureServices(IServiceCollection services)
    {
        services.AddOptions();
        services.Configure(Configuration);
        services.AddSingleton(Configuration);
        services.AddSingleton();
        services.AddScoped((sp) => sp.GetService().HttpContext.User);
        services.AddScoped();

        services.AddHangfire(x => x.UseSqlServerStorage(connectionString));    
        this.ApplicatiOnContainer= getWebAppContainer(services);
        return new AutofacServiceProvider(this.ApplicationContainer);
    }
}

public interface IScheduledTaskService
{
    void OverduePlasmidOrdersTask();
}

public class ScheduledTaskService : IScheduledTaskService
{
    public void DailyJob()
    {
        var cOntainer= getJobContainer();
        using (var scope = container.BeginLifetimeScope())
        {
            IScheduledTaskManager scheduledTaskManager = scope.Resolve();
            scheduledTaskManager.ProcessDailyJob();
        }
    }

    private IContainer getJobContainer()
    {
        var builder = new ContainerBuilder();
        builder.RegisterModule(new BusinessBindingsModule());
        builder.RegisterModule(new DataAccessBindingsModule());
        return builder.Build();
    }
}

如您所见,我正在使用Autofac进行DI.每次Hangfire作业执行时,我都会设置注入新容器.

目前,我有UseHangfireDashboard()一个调用添加我的定期作业注释,我在行参考时收到以下错误IPrincipal:

System.NullReferenceException:'对象引用未设置为对象的实例.'

我知道Hangfire没有HttpContext.我不确定为什么它甚至会为Hangfire线程启动那行代码.我最终需要为我的IPrincipal依赖解析服务帐户.

如何解决Hangfire和HttpContext的问题？