Thread lock on HtmlDocument.InvokeScript

jrox6279

Hello,

I have a C# UI Control that allows Google maps to be displayed in a
Windows Form. I am using the WebBrowser control in a secondary thread
to accomplish this. I make several calls to InvokeScript to move,
size, etc. the maps and 99% of the time it works great. However,
occasionally the InvokeScript calls will lock the secondary thread.
This appears to be because of a deadlock in the Google Maps
Javascript. I have added code to my application to abort and restart
the secondary thread, but the thread never actually gets aborted. I
can still see the threads while debugging in the Threads window. I
have a try...catch for the ThreadAbortException in the secondary
thread, but the exception is never thrown. If I call Join() on the
Thread after calling Abort(), the Join() never returns.

I need a way to either call InvokeScript with a timeout or
asynchronously, or kill the thread completely. Any help would be
greatly appreciated.

Thanks,
Josh

Jan 25 '08 #1

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3855

Jon Skeet [C# MVP]

On Jan 25, 4:40 pm, jrox6...@gmail.com wrote:

I have a C# UI Control that allows Google maps to be displayed in a
Windows Form. I am using the WebBrowser control in a secondary thread
to accomplish this.

That sounds like a bad idea to start with. Just to check what you
mean, this WebBrowser has been created in one thread but you're
calling methods on it from a different thread? That's generally a no-
no with UI controls - do you have anything to suggest that should
wait?

I make several calls to InvokeScript to move,
size, etc. the maps and 99% of the time it works great. However,
occasionally the InvokeScript calls will lock the secondary thread.
This appears to be because of a deadlock in the Google Maps
Javascript. I have added code to my application to abort and restart
the secondary thread, but the thread never actually gets aborted.

You shouldn't use Thread.Abort - it's unsafe.

Jon

Jan 25 '08 #2

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