为什么HttpContext.Current空？ [英] Why is HttpContext.Current null?

问题描述

我有我的所有应用程序中使用的值;我设置在的Application_Start

I have a value that I use in all the application; I set this in application_start

  void Application_Start(object sender, EventArgs e)
  {
    Dictionary<int, IList<string>> Panels = new Dictionary<int, IList<string>>();
    List<clsPanelSetting> setting = clsPanelSettingFactory.GetAll();
    foreach (clsPanelSetting panel in setting)
    {
        Panels.Add(panel.AdminId, new List<string>() { panel.Phone,panel.UserName,panel.Password});
    }
    Application["Setting"] = Panels;

    SmsSchedule we = new SmsSchedule();
    we.Run();

  }

和在SmsSchedule

and in SmsSchedule

public class SmsSchedule : ISchedule
{
    public void Run()
    {           
        DateTimeOffset startTime = DateBuilder.FutureDate(2, IntervalUnit.Second);
        IJobDetail job = JobBuilder.Create<SmsJob>()
            .WithIdentity("job1")
            .Build();

        ITrigger trigger = TriggerBuilder.Create()
             .WithIdentity("trigger1")
             .StartAt(startTime)
             .WithSimpleSchedule(x => x.WithIntervalInSeconds(60).RepeatForever())
             .Build();

        ISchedulerFactory sf = new StdSchedulerFactory();
        IScheduler sc = sf.GetScheduler();
        sc.ScheduleJob(job, trigger);

        sc.Start();
    }
}

我想在一个类此值。（smsjob）

I want to get this value in a class.(smsjob)

   public class SmsJob : IJob 
   {  
      public virtual void Execute(IJobExecutionContext context)
      {
          HttpContext.Current.Application["Setting"]; 
      }
   }

但我的问题是：HttpContext.Current为null，为什么HttpContext.Current空

but my problem is : HttpContext.Current is null, why is HttpContext.Current null?

编辑：
当我用这个code另一类它的工作原理页面，但在这个类我得到的错误。

When i use this code in another class of a page it works, but in this class I get the error.

推荐答案

显然 HttpContext.Current 不是空只有当你访问它在处理传入的请求的线程。这就是为什么它的工作原理时，我用这个code另一个类的网页。

Clearly HttpContext.Current is not null only if you access it in a thread that handles incoming requests. That's why it works "when i use this code in another class of a page".

它不会在你的调度相关工作类，只是因为在一个有效的线程未执行类，但在后台线程它没有HTTP上下文的。

It won't work in your scheduling related class simply because that class is not executed on a valid thread, but a background thread which has no HTTP context at all.

不要使用应用[设置] 来存储全局的东西，因为它们不是全球都为你刚刚得知。

Don't use Application["Setting"] to store global stuffs, as they are not global at all as you just learned.

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