C# 9 최상위 문에 STAThread 사용

아래와 같은 질문이 있군요, ^^

C# Top-level Statements WPF 실행 방법?
; https://forum.dotnetdev.kr/t/c-top-level-statements-wpf/799

C# 9.0 - (15) 최상위 문(Top-level statements)
; https://www.sysnet.pe.kr/2/0/12406

How to handle [STAThread] in C# 9 Using Top-Level Program.cs
; https://stackoverflow.com/questions/64946371/how-to-handle-stathread-in-c-sharp-9-using-top-level-program-cs

Set ApartmentState on a Task
; https://stackoverflow.com/questions/16720496/set-apartmentstate-on-a-task

using System;
using System.Threading;
using System.Threading.Tasks;
using System.Windows;

await StartSTATask(() =>
{
    Application app = new Application();
    app.Startup += (s, e) => new Window().Show();
    app.Run();

    return 0;
});

static Task<T> StartSTATask<T>(Func<T> func)
{
    var tcs = new TaskCompletionSource<T>();
    Thread thread = new Thread(() =>
    {
        try
        {
            tcs.SetResult(func());
        }
        catch (Exception e)
        {
            tcs.SetException(e);
        }
    });

    thread.SetApartmentState(ApartmentState.STA);
    thread.Start();
    return tcs.Task;
}