c# - Hangfire 1.5.3 System.MissingMethodException 在我们所有的工作上

Question

我们刚刚将 hangfire 从 1.3.4 更新到 1.5.3。

我们的创业公司从此发生了变化:

    private static void DoHangfire(IAppBuilder app)
    {
        var options = new BackgroundJobServerOptions
        {
            // Set thread count to 1
            WorkerCount = 1
        };

        app.UseHangfire(config =>
        {
            config.UseSqlServerStorage(ConfigurationManager.ConnectionStrings["JobsDB"].ConnectionString);
            config.UseAuthorizationFilters(new HangfireDashboardAuthorizationFilter());
            config.UseServer(options);
        });

        // Set retries to zero
        GlobalJobFilters.Filters.Add(new AutomaticRetryAttribute { Attempts = 0 });

        JobActivator.Current = new WindsorJobActivator(Container.Kernel);
    }

为此:

    private static void DoHangfire(IAppBuilder app)
    {
        var options = new BackgroundJobServerOptions
        {
            // Set thread count to 1
            WorkerCount = 1
        };

        GlobalConfiguration.Configuration.UseSqlServerStorage(
            ConfigurationManager.ConnectionStrings["JobsDB"].ConnectionString);

        app.UseHangfireDashboard("/hangfire", new DashboardOptions()
                                                  {
                                                      AuthorizationFilters = new List<IAuthorizationFilter>
                                                                                 {
                                                                                     new HangfireDashboardAuthorizationFilter()
                                                                                 }
                                                  });

        app.UseHangfireServer(options);

        // Set retries to zero
        GlobalJobFilters.Filters.Add(new AutomaticRetryAttribute { Attempts = 0 });

        JobActivator.Current = new WindsorJobActivator(Container.Kernel);
    }

现在我们所有的工作(我们有 4 种不同的工作)立即失败并出现此错误:

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.SimpleJobActivatorScope.Resolve(Type type) at Hangfire.Server.CoreBackgroundJobPerformer.Perform(PerformContext context) at Hangfire.Server.BackgroundJobPerformer.<>c__DisplayClass3.b__0() at Hangfire.Server.BackgroundJobPerformer.InvokePerformFilter(IServerFilter filter, PerformingContext preContext, Func1 continuation) at Hangfire.Server.BackgroundJobPerformer.PerformJobWithFilters(PerformContext context, IEnumerable1 filters) at Hangfire.Server.BackgroundJobPerformer.Perform(PerformContext context) at Hangfire.Server.Worker.PerformJob(BackgroundProcessContext context, IStorageConnection connection, String jobId)

Answer 1

这个问题与新版本的 Hangfire 如何与 Hangfire.Windsor 交互有关。包，它只是提供一个自定义的 JobActivator 和一个用于服务定位的 windsor 容器。

通过移动

JobActivator.Current = new WindsorJobActivator(Container.Kernel);

在对 app.UseHangfireServer() 的调用之上，我们能够发现真正的异常消息，这是一个 CaSTLe.MicroKernel.ComponentNotFoundException 通知我们它无法连接包含我们希望 hangfire 运行的方法的依赖项。

可以这么说，在 1.3.4 中，要运行作业，您可以这样做:

BackgroundJob.Enqueue(() => thingWhichDoesStuff.DoStuff()); 

其中 thingWhichDoesStuff 被注入(inject)到包含类中，而 hangfire.windsor JobActivator 神奇地能够解析为该类型。

但是在 1.5.3 中这个神奇的解决方案不再发生，所以你必须明确地告诉 JobActivator 包含你希望 hangfire 运行的方法的类型的接口(interface):

BackgroundJob.Enqueue<IDoStuff>(x => x.DoStuff());  

这会使我们所有的作业重新开始工作。