C# 如何在Microsoft.Extensions.DependencyInjection中使用Asp.Net 4.7和DI设置Hangfire？

我正在尝试在Asp.Net 4.7.2 MVC应用程序中使用带有Microsoft.Extensions.DependencyInjection的Hangfire。 我有DI的设置和工作，我只是不能正确配置Hangfire。下面的当前实现运行仪表板，但执行后台任务会返回错误： JobActivator返回了“Dh.Web.Services.EmailService”类型的空实例

我知道EmailService在DI中设置正确，因为我可以在调用BackgroundJob.Enqueue方法的同一控制器中使用DI访问它

我的实施是：

HangfireActivator.cs

    public class HangfireActivator : JobActivator
    {
        private readonly IServiceProvider _serviceProvider;

        public HangfireActivator(IServiceProvider serviceProvider)
        {
            _serviceProvider = serviceProvider;
        }

        public override object ActivateJob(Type type)
        {
            return _serviceProvider.GetService(type);
        }
    } 

        private void ConfigureHangfire(IServiceProvider serviceProvider, IAppBuilder app)
        {
            var hangfireConnString = ConfigurationManager.ConnectionStrings["Dh"].ConnectionString;

            GlobalConfiguration.Configuration
                .SetDataCompatibilityLevel(CompatibilityLevel.Version_170)
                .UseSimpleAssemblyNameTypeSerializer()
                .UseRecommendedSerializerSettings()
                .UseActivator(new HangfireActivator(serviceProvider))
                .UseSqlServerStorage(hangfireConnString, new SqlServerStorageOptions
                    {
                        CommandBatchMaxTimeout = TimeSpan.FromMinutes(5),
                        SlidingInvisibilityTimeout = TimeSpan.FromMinutes(5),
                        QueuePollInterval = TimeSpan.FromSeconds(10),
                        UseRecommendedIsolationLevel = true,
                        UsePageLocksOnDequeue = true,
                        DisableGlobalLocks = true,
                    }
                );

            app.UseHangfireServer(new BackgroundJobServerOptions {WorkerCount = 3});

            var options = new DashboardOptions()
            {
                Authorization = new[] {new SystemAuthorizationFilter()}
            };
            app.UseHangfireDashboard("/hangfire",options);
        }

        public void Configuration(IAppBuilder app)
        {
            var services = new ServiceCollection();

            //App DI 
            ConfigureServices(services);

            var serviceProvider = services.BuildServiceProvider();
            var resolver = new DefaultDependencyResolver(serviceProvider);
            DependencyResolver.SetResolver(resolver);

            //Hangfire
            ConfigureHangfire(serviceProvider,app);
        }

在startup.cs内部配置hangfire方法

    public class HangfireActivator : JobActivator
    {
        private readonly IServiceProvider _serviceProvider;

        public HangfireActivator(IServiceProvider serviceProvider)
        {
            _serviceProvider = serviceProvider;
        }

        public override object ActivateJob(Type type)
        {
            return _serviceProvider.GetService(type);
        }
    } 

        private void ConfigureHangfire(IServiceProvider serviceProvider, IAppBuilder app)
        {
            var hangfireConnString = ConfigurationManager.ConnectionStrings["Dh"].ConnectionString;

            GlobalConfiguration.Configuration
                .SetDataCompatibilityLevel(CompatibilityLevel.Version_170)
                .UseSimpleAssemblyNameTypeSerializer()
                .UseRecommendedSerializerSettings()
                .UseActivator(new HangfireActivator(serviceProvider))
                .UseSqlServerStorage(hangfireConnString, new SqlServerStorageOptions
                    {
                        CommandBatchMaxTimeout = TimeSpan.FromMinutes(5),
                        SlidingInvisibilityTimeout = TimeSpan.FromMinutes(5),
                        QueuePollInterval = TimeSpan.FromSeconds(10),
                        UseRecommendedIsolationLevel = true,
                        UsePageLocksOnDequeue = true,
                        DisableGlobalLocks = true,
                    }
                );

            app.UseHangfireServer(new BackgroundJobServerOptions {WorkerCount = 3});

            var options = new DashboardOptions()
            {
                Authorization = new[] {new SystemAuthorizationFilter()}
            };
            app.UseHangfireDashboard("/hangfire",options);
        }

        public void Configuration(IAppBuilder app)
        {
            var services = new ServiceCollection();

            //App DI 
            ConfigureServices(services);

            var serviceProvider = services.BuildServiceProvider();
            var resolver = new DefaultDependencyResolver(serviceProvider);
            DependencyResolver.SetResolver(resolver);

            //Hangfire
            ConfigureHangfire(serviceProvider,app);
        }

最后是Startup.cs中的配置方法

    public class HangfireActivator : JobActivator
    {
        private readonly IServiceProvider _serviceProvider;

        public HangfireActivator(IServiceProvider serviceProvider)
        {
            _serviceProvider = serviceProvider;
        }

        public override object ActivateJob(Type type)
        {
            return _serviceProvider.GetService(type);
        }
    } 

        private void ConfigureHangfire(IServiceProvider serviceProvider, IAppBuilder app)
        {
            var hangfireConnString = ConfigurationManager.ConnectionStrings["Dh"].ConnectionString;

            GlobalConfiguration.Configuration
                .SetDataCompatibilityLevel(CompatibilityLevel.Version_170)
                .UseSimpleAssemblyNameTypeSerializer()
                .UseRecommendedSerializerSettings()
                .UseActivator(new HangfireActivator(serviceProvider))
                .UseSqlServerStorage(hangfireConnString, new SqlServerStorageOptions
                    {
                        CommandBatchMaxTimeout = TimeSpan.FromMinutes(5),
                        SlidingInvisibilityTimeout = TimeSpan.FromMinutes(5),
                        QueuePollInterval = TimeSpan.FromSeconds(10),
                        UseRecommendedIsolationLevel = true,
                        UsePageLocksOnDequeue = true,
                        DisableGlobalLocks = true,
                    }
                );

            app.UseHangfireServer(new BackgroundJobServerOptions {WorkerCount = 3});

            var options = new DashboardOptions()
            {
                Authorization = new[] {new SystemAuthorizationFilter()}
            };
            app.UseHangfireDashboard("/hangfire",options);
        }

        public void Configuration(IAppBuilder app)
        {
            var services = new ServiceCollection();

            //App DI 
            ConfigureServices(services);

            var serviceProvider = services.BuildServiceProvider();
            var resolver = new DefaultDependencyResolver(serviceProvider);
            DependencyResolver.SetResolver(resolver);

            //Hangfire
            ConfigureHangfire(serviceProvider,app);
        }

我怀疑这是一行：

var serviceProvider=services.BuildServiceProvider（）这是创建一个独立的服务提供商，我在其中设置了所有应用程序DI，但如果没有该行，我不知道如何将服务提供商设置为Hangfire中的UseActivator选项

我真的非常感谢任何意见。谢谢大家!
 我已在我的DI中注册：
services.AddTransient（）

但是，在没有接口的情况下，添加这个来注册具体类是可行的。
services.AddTransient（）
我已在DI中注册：
services.AddTransient（）

但是，在没有接口的情况下，添加这个来注册具体类是可行的。
services.AddTransient（）