C# BackgroundWorker AxCWGraph 7.1

[oren_fourier]

Hi,

Measurement Studio 7.1 - C# .Net 2.0 application.

When trying to create an instance of AxCWGraph in a BackgroundWorker the following error appear:

"ActiveX control 'b68dbfab-16a0-11ce-80bf-0020af31cef9' cannot be instantiated because the current thread is no a single-threaded apartment".

I would like to take snapshots of  runtime generated graphs that contain a lot of data. this takes a lot of time and stuck the application. I would like that the main application will continue running normally and  the graph snapshots/images will be done in the background.

I would appreciate your help

Thanks in advance'

oren

[Scott-M]

Hi Oren,

The following KnowledgeBase article was written for TestStand however I think the same logic applies:

Why am I Seeing Single-Threaded Apartment Errors When Launching a Module Containing ActiveX Controls in TestStand?

http://digital.ni.com/public.nsf/allkb/3F46208C73E6C92186256E9900758D6A?OpenDocument

The key line may be "because ActiveX does not support multithreading". Unfortunately this means you wont be able to implement the solution with a BackgroundWoker, you may have to look into ways of reducing the amount of data in your graph, so you can get both operations working in the same thread.

Thanks

Scott M.