RunWorkerCompleted call from worker thread in VB CCW

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Dicky - 29 Jan 2007 06:20 GMT

I have a .net library with backgroundWorker object, and it is working fine in
.net environment. Then I exposes the library to VB application to call. Using
standard Callable COM Wrapper (CCW) method, the method can be called, but I
notice that backgroundWorker_RunWorkerCompleted() method will be called from
worker thread, instead of the main thread. And eventually throw exception in
my side as some UI are updated in RunWorkerCompleted method.

Is it a known issue from Microsoft?

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Ciaran O''Donnell - 29 Jan 2007 13:01 GMT

You need to use the Control.InvokeRequired property to check whether you are
on the UI thread and if not (true from prop), call invoke.

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Ciaran O''Donnell
http://wannabedeveloper.spaces.live.com

> I have a .net library with backgroundWorker object, and it is working fine in
> .net environment. Then I exposes the library to VB application to call. Using
[quoted text clipped - 4 lines]
>
> Is it a known issue from Microsoft?

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