runtime: STAThread attribute is not respected in netcoreapp

Create a new netcoreapp2.0 project and set the Program.cs file to:

using System;
using System.Threading;

namespace ConsoleApp4
{
    class Program
    {
        [STAThread]
        static void Main(string[] args)
        {
            Console.WriteLine(Thread.CurrentThread.GetApartmentState());
            Console.ReadLine();
        }
    }
}

Examine that the output from the application is:

MTA

Not respecting STAThread means that users who depend on it (even if it really only matters on Windows), have to manually spawn a thread to run their code.

In some cases, certain libraries actually check and enforce that the calling thread is STA, and will throw an exception if it is not.