在这种情况下，请求不可用

问题描述

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Exception Details: System.Web.HttpException: Request is not available in this context

Source Error:

Line 7:     Private Sub Application_Start(sender As Object,e As EventArgs)
Line 8:     \' Caching the tracker image in memory
Line 9:     Dim trackerImg As Byte() = File.ReadAllBytes(Context.Request.MapPath(ConfigurationManager.AppSettings(\"SD_Tut_ImageFileLocation\")))
Line 10:    Application(ConfigurationManager.AppSettings(\"SD_Tut_ImageFileKeyName\")) = trackerImg

错误在第9行 这是Global.asax代码

<%@ Application Language=\"vb\" %>
<%@ Import Namespace=\"System.IO\" %>
<%@ Import Namespace=\"System.Collections.Generic\" %>
<%@ Import Namespace=\"Stardeveloper.Tutorial\" %>

<script runat=\"server\">
   Private Sub Application_Start(sender As Object,e As EventArgs)
    \' Caching the tracker image in memory
    Dim trackerImg As Byte() = File.ReadAllBytes(Context.Request.MapPath(ConfigurationManager.AppSettings(\"SD_Tut_ImageFileLocation\")))
    Application(ConfigurationManager.AppSettings(\"SD_Tut_ImageFileKeyName\")) = trackerImg

    \' Creating a new request queue collection
    Dim queueCapacity As Integer = Convert.ToInt32(ConfigurationManager.AppSettings(\"SD_Tut_TrackerRequestsToCache\"))
    Dim trackerReqQueue As New Queue(Of TrackerRequest)(queueCapacity)
    Application(ConfigurationManager.AppSettings(\"SD_Tut_TrackerCachedRequestsKeyName\")) = trackerReqQueue
End Sub

Private Sub Application_End(sender As Object,e As EventArgs)
    \' Storing the queued tracker reqs to database
    Dim trackerReqQueue As Queue(Of TrackerRequest) = DirectCast(Application(ConfigurationManager.AppSettings(\"SD_Tut_TrackerCachedRequestsKeyName\")),Queue(Of TrackerRequest))
    Tracker.FlushRequestQueueCache(trackerReqQueue)
End Sub

</script>

    

解决方法

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