Session and Thread in ASP.NET

Question

I have a ASP.NET website where a thread is responible for doing some code retrived from a database queue.

Is it possible to get access to the Session or pass that as a parameter ?

My current code looks a follows:

MediaJob nextJob = GetNextJobFromDB();

CreateMedia media = new CreateMedia();

Thread t = new Thread(new parameterizedThreadStart(media.DOSTUFF);

t.Start(nextJob);

The HttpContext.Current.Session is null when running in a thread, so cant do that

Royi Namir · Answer 1 · 2014-06-10T09:09:46.040

3

edited:

 HttpContext ctx = HttpContext.Current;
 Thread t = new Thread(new ThreadStart(() =>
                {
                    HttpContext.Current = ctx;
                    worker.DoWork();
                }));
 t.Start();
 // [... do other job ...]
 t.Join();

edited Jun 10 '14 at 09:09

answered Dec 05 '11 at 12:40

Royi Namir

144,742
138
468
792

Author edited his answer to say that no, `HttpContext.Current.Session` is not available in the new thread. – Jon Adams Dec 05 '11 at 16:59
1

The code in the answer matches the one here word for word. http://stackoverflow.com/questions/8925227/access-httpcontext-current-from-threads – SpartaSixZero Mar 09 '16 at 16:11
The `Session` is still null inside the Thread, using this approach – Don Cheadle Jul 21 '16 at 16:28

score 3 · Accepted Answer · answered Dec 05 '11 at 14:41

3

If your job gets done outside the asp.net thread, then its probably not safe to assume that session would be available. Only deterministic way would be to pass this data explicitly to the thread. You can do this by assigning data in a named data slot

answered Dec 05 '11 at 14:41

np-hard

5,725
6
52
76

score 0 · Answer 3 · answered Jan 07 '14 at 20:04

0

You can't access the session from within a thread, but you could share your data using: HttpRuntime.Cache

There are a few things to keep in mind though: unlike session, cache do expire. Also the cache is shared between all web users.

answered Jan 07 '14 at 20:04

Johann

12,158
11
62
89

Session and Thread in ASP.NET

3 Answers3