Question

I’m thinking of using this code to detect if the thread is the main (UI) thread.

public static bool IsMainThread()
{
    return Thread.CurrentThread.GetApartmentState() == ApartmentState.STA;
}

It certainly appears to work fine with worker threads running tasks returning false, just wondering if it is generally true.

If it’s relevant, this is a WPF application.

This is similar to my other question: How do I assert that the code is running in the main thread? But no one suggested this solution.

Answer 1

Yes, you can set STA on other threads when you create them. Thread pool threads are in the MTA.