About AccessViolationException with Webbrowser and Multi-Thread

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Hi,I have a problem. I have a project based multi-thread. All threads have webbrowser control.
The project works fine on single thread. But when i am trying to work on multi-thread, i get AccessViolationException. There is "document.GetElementById();" expression on line of exception thrown. Does anyone have an idea?

Posted 11-Jul-14 5:34am

Regaloq

Updated 11-Jul-14 5:42am

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Dave Kreskowiak · Answer 1 · 2014-07-11T12:58:00

Solution 1

You cannot use nor create instances of the webbrowser control on any thread other than the UI (startup) thread.

You also cannot touch, in any way at all, any control on a form from anything other than the UI thread.

If you must set properties and call methods on UI controls from other threads you have to Invoke methods on the UI thread to do so.

C# Invoke method on UI thread[^]

Posted 11-Jul-14 12:58pm

Dave Kreskowiak

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Regaloq 11-Jul-14 20:19pm

Hi i have a second form and it contains webbrowser. Then i starting a new thread and creating second form like below:
Thread t = new Thread(()=>
{
Application.Run(secondForm);
secondForm.Webbrowser.Document.GetElementById(""); // thrown AccessViolationException
});
t.SetApartmanState(ApartmanState.STA);
t.Start();

It works fine but if thread count are two it throwed exception