Question

我得到＆＃34;无法访问被处置对象＆＃34;在调用使用DI注入的dbcontext（Transient-scoped）的方法期间的异常 - 很可能dbcontext在被调用时已经被释放。该方法由流畅的调度程序作为作业调用：

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

ExecuteUpdateDbContext方法适用于任何情况，除非由流畅的调度程序使用。我是否需要使用我的ExecuteUpdateDbContext方法执行一些特殊操作才能使其与流畅的调度程序一起使用？

Answer 1

我在流畅的调度程序或其他同步功能上遇到了相同的问题。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。

我在startup.cs的Configure（）函数中初始化了我的作业管理器-

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

SchedulerRegistry-

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

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();
        }
    }
}

当流畅的调度程序作业

1 个答案: