c# - Hangfire - 没有为此对象定义无参数构造函数

Question

我正在使用 Hangfire 执行一些重复性工作，但出现以下异常:

System.MissingMethodException

No parameterless constructor defined for this object.

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)
   at Hangfire.Server.BackgroundJobPerformer.<>c__DisplayClass8_0.<PerformJobWithFilters>b__0()
   at Hangfire.Server.BackgroundJobPerformer.InvokePerformFilter(IServerFilter filter, PerformingContext preContext, Func`1 continuation)
   at Hangfire.Server.BackgroundJobPerformer.<>c__DisplayClass8_1.<PerformJobWithFilters>b__2()
   at Hangfire.Server.BackgroundJobPerformer.PerformJobWithFilters(PerformContext context, IEnumerable`1 filters)
   at Hangfire.Server.BackgroundJobPerformer.Perform(PerformContext context)
   at Hangfire.Server.Worker.PerformJob(BackgroundProcessContext context, IStorageConnection connection, String jobId)

我已经在我的 AppBuilder 中初始化了我的 Hangfire:

Hangfire.GlobalConfiguration.Configuration.UseSqlServerStorage(ConfigurationManager.ConnectionStrings[ConfigurationKeys.DbDefaultConnectionName].ConnectionString);

        app.UseHangfireDashboard();
        app.UseHangfireServer();

基本上，您可以在我的应用程序中创建契约(Contract)。每次创建契约(Contract)时，我都会使用以下行添加一个新的重复性工作:

RecurringJob.AddOrUpdate(() => AutomaticMovementsCreation(contractToCreate.DebitValue, contractId, descriptionId.Result), Cron.Minutely);

这是要添加 RecurringJob 的类的构造函数:

public ContractServiceImpl(IAuthService authService, IContractStore contractStore)
{
    _contractStore = contractStore;
    _authService = authService;
}

方法 AutomaticMovementsCreation 正在使用 _contractStore。

我认为是依赖注入(inject)的问题，但我真的不知 Prop 体是什么以及如何解决它。顺便说一句，我正在使用 Unity 容器来注册我的应用程序依赖项。

整个启动:

public void Configuration(IAppBuilder app)
{
    var httpConfiguration = new HttpConfiguration();

    ConfigureUnity(app, httpConfiguration);
    ConfigureWebApi(httpConfiguration);
    ConfigureAuth(app);

    //Set configuration into Owin
    app.UseWebApi(httpConfiguration);

    Hangfire.GlobalConfiguration.Configuration.UseSqlServerStorage(ConfigurationManager.ConnectionStrings[ConfigurationKeys.DbDefaultConnectionName].ConnectionString);

    app.UseHangfireDashboard();
    app.UseHangfireServer();

}

public void ConfigureUnity(IAppBuilder app, HttpConfiguration config) {
    UnityContainer container = UnityConfig.GetConfiguredContainer() as UnityContainer;

    if (app.GetDataProtectionProvider() == null) {
        app.UseAesDataProtectionProvider();
    }

    IDataProtectionProvider dataProtectionProvider = app.GetDataProtectionProvider();

    container.RegisterInstance(dataProtectionProvider);


    app.CreatePerOwinContext(() =>
        UnityConfig.GetConfiguredContainer().Resolve<ApplicationUserManager‌​>()
    );

    config.DependencyResolver = new UnityDependencyResolver(UnityConfig.GetConfiguredContainer());

}

在此方法中，GetConfiguredContainer 是我注册服务和数据存储的地方。

Answer 1

使用以下代码解决了这个问题:

    Hangfire.GlobalConfiguration.Configuration.UseActivator(new ContainerJobActivator(container));
    Hangfire.GlobalConfiguration.Configuration.UseSqlServerStorage(ConfigurationManager.ConnectionStrings[ConfigurationKeys.DbDefaultConnectionName].ConnectionString);
    app.UseHangfireDashboard();
    app.UseHangfireServer();




 public class ContainerJobActivator : JobActivator
    {
        private IUnityContainer _container;

        public ContainerJobActivator(UnityContainer container)
        {
            _container = container;
        }

        public override object ActivateJob(Type type)
        {
            return _container.Resolve(type);
        }
    }