用于hangfire的Autofac配置

Question

我想在我的 Asp.Net MVC 应用程序中使用 hangfire，并且我正在使用 Autofac 作为 DI。
我已经安装了 Hangfire.Autofac nuget
我想添加这样的经常性工作：

---

UserService.cs

public class UserService : IUserService
{
    public void MyRecurringJob() { // do something here }
}

---

startup.cs

[assembly: OwinStartup(typeof(MyApp.Web.Startup))]
namespace MyApp.Web
{
    public class Startup
    {
        public void Configuration(IAppBuilder app)
        {
            var AutofacContainer = AutofacDependencyResolver.Current.ApplicationContainer;
            GlobalConfiguration.Configuration.UseSqlServerStorage("AppDbContext").UseAutofacActivator(AutofacContainer);

            app.UseHangfireDashboard("/jobs");
            app.UseHangfireServer();

            var _user = DependencyResolver.Current.GetService<IUserService>();
            RecurringJob.AddOrUpdate("SyncUsers", () => _user.MyRecurringJob(), Cron.Hourly());
        }
    }
}

我得到这个错误：

Unable to resolve the type 'MyApp.Core.Service.UserService' because the lifetime scope it belongs in can't be located. The following services are exposed by this registration: - MyApp.Core.Service.UserService Details

Autofac.Core.DependencyResolutionException: Unable to resolve the type 'MyApp.Core.Service.UserService' because the lifetime scope it belongs in can't be located. The following services are exposed by this registration:
- MyApp.Core.Service.UserService

Details ---> Autofac.Core.DependencyResolutionException: No scope with a tag matching 'AutofacWebRequest' is visible from the scope in which the instance was requested.

If you see this during execution of a web application, it generally indicates that a component registered as per-HTTP request is being requested by a SingleInstance() component (or a similar scenario). Under the web integration always request dependencies from the dependency resolver or the request lifetime scope, never from the container itself.

Answer 1

我现在无法对其进行测试，但是为了使用 Hangfire 和 Autofac 注册一个经常性的工作，您应该编写

RecurringJob.AddOrUpdate<UserService>("SyncUsers", (user) => user.MyRecurringJob(), Cron.Hourly());