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Using Application Var's in a background thread

Posted on 2011-03-04
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Last Modified: 2013-11-19
Hi there,
This is what I tried to do:
In global.asax:
// read-only in the client sessions, write only in a background thread
Application["OnSaleCounter"] = (Int64)1;
// SET UP BACKGROUND THREAD
System.Threading.Thread th = new System.Threading.Thread(new System.Threading.ThreadStart(CheckOpenManager.OpenForBidingThread));
th.IsBackground = true;  th.Start();
In the CheckOpenManager class I try to read and update this Counter,
System.Web.HttpContext.Current.Application["OnSaleCounter"]
but I get the Error = null
because the code is not running in httpContext, is there another way to
read/write application variabels in a background thread or do I put it in a seperate
dummy page? And can I call that page in global.asax?

Jürgen
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Question by:Jurgen Thys
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2 Comments
 
LVL 33

Accepted Solution

by:
Todd Gerbert earned 2000 total points
ID: 35038992
I'm not sure if that's considered safe or not to be using threads at all in a web application. Could be, I just don't know - seems dangerous though. ;)

If you do continue to use threads make sure there's some thread synchronization to make sure more than one thread isn't trying to use the same resource at the same time.  Now that I think about it - I'm not sure you have any way to make access to the ApplicationContext thread-safe.

But to answer your question, you can try passing a reference to the HttpContext in the thread's start.

Thread th = new Thread(OpenForBidingThread);
th.Start(HttpContext.Current);

private void OpenForBidingThread(object threadArg)
{
    HttpContext context = threadArg as HttpContext;
}

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Author Closing Comment

by:Jurgen Thys
ID: 35046646
Hi,
This solution works PERFECT. I can finally update a Application variabel
in a background stream.

Thanks very much!

Jürgen,
0

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