当流利的调度程序作业调用方法时，无法访问已处置的对象异常 [英] Cannot access a disposed object exception when method invoked by fluent scheduler job

问题描述

在调用使用注入了DI的dbcontext（瞬态作用域）的方法时，出现无法访问已处置的对象异常-很可能是在调用dbcontext时已经将其处置了。流利的调度程序正在将该方法作为作业调用：

I'm getting the "Cannot access a disposed object" exception during a call to a method that uses a DI-injected dbcontext (Transient-scoped)-- most likely the dbcontext was already disposed when being invoked. The method is being invoked as a job by fluent scheduler:

JobManager.AddJob(
   () => ExecuteUpdateDbContext(),
   (s) => s.ToRunNow().AndEvery(60).Minutes()
);

ExecuteUpdateDbContext方法在任何情况下都可以使用，除非由流利的调度程序使用。我需要对ExecuteUpdateDbContext方法做一些特殊的事情以使其与流畅的调度程序一起工作吗？

The ExecuteUpdateDbContext method works in any under circumstance except when used by fluent scheduler. Do I need to do something special with my ExecuteUpdateDbContext method to make it work with fluent scheduler?

推荐答案

我遇到了同样的问题流利的调度程序或其他同步功能。
为此，我创建了一个 ServiceScopeFactory 对象，并将其注入注册表的构造函数中。

I encountered the same problem with fluent scheduler or other synchronous functions. For this I created a ServiceScopeFactory object and injected it in the registry's constructor.

我初始化了startup.cs的Configure（）函数中的作业管理器-

I initialized my job manager in Configure() function of startup.cs -

public void Configure(IApplicationBuilder app, IHostingEnvironment env)
{
    IServiceScopeFactory serviceScopeFactory = app.ApplicationServices.GetRequiredService<IServiceScopeFactory>();
    JobManager.Initialize(new SchedulerRegistry(serviceScopeFactory));
}

SchedulerRegistry-

SchedulerRegistry -

public SchedulerRegistry(IServiceScopeFactory serviceScopeFactory)
        {
Schedule(() => new SyncUpJob(serviceScopeFactory)).ToRunNow().AndEvery(1).Months().OnTheFirst(DayOfWeek.Monday).At(3, 0);
}

SyncupJob-

SyncupJob -

public class SyncUpJob : IJob
{
    /// <summary>
    /// 
    /// </summary>
    /// <param name="migrationBusiness"></param>
    public SyncUpJob (IServiceScopeFactory serviceScopeFactory)
    {
        this.serviceScopeFactory = serviceScopeFactory;
    }

    private IServiceScopeFactory serviceScopeFactory;

    /// <summary>
    /// 
    /// </summary>
    public void Execute()
    {
        // call the method to run weekly 
        using (var serviceScope = serviceScopeFactory.CreateScope())
        {
            IMigrationBusiness migrationBusiness = serviceScope.ServiceProvider.GetService<IMigrationBusiness>();
            migrationBusiness.SyncWithMasterData();
        }
    }
}

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