Parallel Issue: Cross-thread operation not valid: Control accessed from a thread other than the thread it was created on

Question

I have this simple code:

 Parallel.Invoke( () => picturebox_1.Refresh(), () => picturebox_2.Refresh());

and I'm getting this:

Cross-thread operation not valid: Control accessed from a thread other than the thread it was created on.

How can I resolve this issue? I just want to run the refresh in parallel, the refresh method runs the Paint Event which has code to render an image...

Thanks!

T McKeown · Accepted Answer · 2013-12-27 14:34:38Z

2

You must invoke using the UI thread, you cannot update the UI on a thread that you created, you must use the forms invoke method or the controls...

answered Dec 27, 2013 at 14:34

T McKeown

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2 Comments

Boas Enkler Over a year ago

As a result of this ui operations can'nt be parallized, because the UI only runs in one thread. Why do you want to parallelize the refresh ?

Matimont Over a year ago

The reason I would like to parallelize the refresh is because I could refresh both controls at the same time instead of one after the other.. I think I can gain some performance by doing this?

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