Invoke required to run an external thread?

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Hello everyone.

Ok so I have been told that you cannot run a thread created by another program in VB.net without using an invoke? Is this true? I believe this also helps the thread to become thread safe?! Can anyone explain this or suggest a better way of running this thread?

Thanks,
James

Posted 25-May-11 5:40am

Jamesdf

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Alan N 25-May-11 12:25pm

I don't think anyone is going to able to answer this as you appear to have mixed up many concepts. Can I suggest you rewrite the question in relation to a specific problem. As a starter we'll need to know about "another program" and "this thread".

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Sergey Alexandrovich Kryukov · Answer 1 · 2011-05-25T06:12:00

This is related exclusively to the UI.

You cannot call anything in UI from a non-UI thread. You can use BeginInvoke or Invoke of System.Threading.Dispatcher (both forms and WPF, preferred) or System.Windows.Forms.Control (Forms only, apparently).

See detailed explanation and samples code in my past asnwers:
Control.Invoke() vs. Control.BeginInvoke()[^],
Problem with Treeview Scanner And MD5[^].

More links on thread use:
How to get a keydown event to operate on a different thread in vb.net[^],
Control events not firing after enable disable + multithreading[^].

If you want to do something like that to a general-purpose (non-UI) thread, it needs a special effort. I actually implemented a very similar invocation mechanism.

Please see my Tips/Tricks article here for a full source code, detailed explanation and usage samples:
Simple Blocking Queue for Thread Communication and Inter-thread Invocation[^].

—SA