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Problems with threads in C # from an external process

I have this simple code:

public void Run()
{
   var invokerThread = new Thread(new ThreadStart(RunOnBackground));
   invokerThread.Start();
}

private void RunOnBackground()
{
   Trace.WriteLine("hi");
   ...
}

Unfortunately, when you run this code (from a third-party process), the thread really does not start. Either in the process explorer or in the VS debugger, I see that the thread has been created and its status is "Running".

The main thread of the STA apartment, and I tried both STA and MTA on the internal thread.

When I add to the method Run()at the end invokerThread.Join();, the thread starts. But again, this does not help.

What am I missing?

Edit: here is some more code hosting info -

Run() the method is called through COM interaction from a process that is also controlled by the executable assembly (the reason for using COM interaction is that all other components in the system are native).

RunOnBackground() , 10 20 , . , Trace. Run() , invokerThread.Start(); invokerThread - "Running" ( RunOnBackground() ).

invokerThread.Join() Run(), RunOnBackground() Join().

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