Reliable way to check if current thread is the main thread in console and WPF applications

[alexey-leonovich]

I need to check if current thread is the main thread. I need to support both console and WPF applications - so I cannot check SynchronizationContext.Current or Application.Current.Dispatcher.Thread. An I need to support both .NFW 472 and .NET 8.0.

1. Is it reliable to suppose that for a main thread Thread.CurrentThread.ManagedThreadId always equals 1?
2. If not - is it enough to check via

if (Thread.CurrentThread.GetApartmentState() == ApartmentState.STA && Thread.CurrentThread.ManagedThreadId == 1 &&
    !Thread.CurrentThread.IsBackground && !Thread.CurrentThread.IsThreadPoolThread && Thread.CurrentThread.IsAlive)
{
    // it is the main thread
}

or is it an overkill and there is a simplier solution?
3) Or maybe some extra checks via reflection are needed:

public static bool CheckForMainThread()
{
    if (Thread.CurrentThread.GetApartmentState() == ApartmentState.STA && Thread.CurrentThread.ManagedThreadId == 1 &&
        !Thread.CurrentThread.IsBackground && !Thread.CurrentThread.IsThreadPoolThread && Thread.CurrentThread.IsAlive)
    {
        MethodInfo correctEntryMethod = Assembly.GetEntryAssembly().EntryPoint;
        StackTrace trace = new StackTrace();
        StackFrame[] frames = trace.GetFrames();
        for (int i = frames.Length - 1; i >= 0; i--)
        {
            MethodBase method = frames[i].GetMethod();
            if (correctEntryMethod == method)
            {
                return true;
            }
        }
    }
    return false;
}

Thank you.