使用定时器导致HttpContext.Current为空 [英] use of timer causes HttpContext.Current to be null

问题描述

我有解析输入文件的功能。

I have a function that parses an input file.

Private Function getSvSpelOdds(ByVal BombNo As Integer) As Boolean

        Dim InputFileBase As String = HttpContext.Current.Application("InputFileBase")
        strInputFile = InputFileBase & "PC_P7_D.TXT"

        OddsReader = New StreamReader(strInputFile)
        'some other code
 End Function       

如果该文件不存在（getSvSpelOdds返回False），我想在30秒后重试。
要做到这一点我用一个定时器。

If the file is not there (getSvSpelOdds returns False), I would like to retry after 30 seconds. To achieve this I use a timer.

    If Not getSvSpelOdds(y) Then
          Timer1.Interval = 30000
    End If

Private Sub Timer1_Elapsed(sender As Object, e As System.Timers.ElapsedEventArgs) Handles Timer1.Elapsed

    getSvSpelOdds(y)
End Sub

问题是，当定时器触发HttpContext.Current（用于获取gloal变量的值）为null。

Problem is that when timer fires the HttpContext.Current (used to get the value of gloal variable) is null.

我应该用一些其他的方法来得到这个工作？

Should I use some other approach to get this to work?

推荐答案

如前所述的HttpContext应为空。但是你可以使用System.Web.HttpRuntime.Cache来传递文件名，缓存应该从所有线程访问。

As already described HttpContext should be null as Timer_Elapsed is called in different thread. But you may use System.Web.HttpRuntime.Cache to pass filename, cache should be accessible from all threads.

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