Asp.net(VB)，在线程里使用 HttpContext.Current 为什么返回 Nothing 呢？

[QB97]

Asp.net(VB)，在线程里使用 HttpContext.Current 为什么返回 Nothing 呢？
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就是在ClassA里开始一个线程ClassB，而ClassB里调用的ClassC中使用
HttpContext.Current
但　HttpContext.Current　却返回的是 Nothing　？？？
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麻烦各位指点小弟一下，都折腾我一周多了还是弄不明白……５５５５~~~~


Asp.net(VB)，在线程里使用 HttpContext.Current 为什么返回 Nothing 呢？
---------------------------------------
就是在ClassA里开始一个线程ClassB，而ClassB里调用的ClassC中使用
HttpContext.Current
但　HttpContext.Current　却返回的是 Nothing　？？？


附：

大概就是下面这种环境：
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1 Public Class ClassA
2 ……
3 Public Sub Send()
4 Dim cClassB As New cClassB
5 Dim ThreadClassB As New Thread(AddressOf cClassB.Send)
6 ThreadClassB.Start()
7 ……
8 End Sub
9 End Class
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10 Public Class ClassB
11 ……
12 Public Sub Send()
13 Dim cClassC As New ClassC
14 Dim myModuleSettings As ModuleSettings = cClassC.GetSettings
15 ……
16 End Sub
17 End Class
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18 Public Class ClassC
19 ……
20 Public Shared Function GetSettings() As ModuleSettings
21 Dim context As HttpContext = HttpContext.Current
22 Dim data As ModuleSettings = CType(context.Cache("Settings"),
ModuleSettings)
23 ……
24 End Function
25 End Class
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26 Public Class ModuleSettings
27 ……
28 End Class
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出现问题：
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在　
----------
22 Dim data As ModuleSettings = CType(context.Cache("Settings"),
ModuleSettings)　
----------
产生　System.NullReferenceException　异常。
单步调试发现：
----------
21 Dim context As HttpContext = HttpContext.Current
----------
中 HttpContext.Current　返回　Nothing　？？？
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[saucer]

http://groups.google.com/groups?hl=en&lr=&ie=UTF-8&oe=UTF-8&selm=%23KFRJgoTDHA.2128%40TK2MSFTNGP12.phx.gbl

"....
The Current static method will work without any problem on the current thread. If you want to create new thread and work with the context you can pass it as parameter to the thread. You can see my example:

http://www.developersdex.com/gurus/code/662.asp
...."

[QB97]

明白了！哈，非常感谢saucer兄了！