using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading;

using System.Threading.Tasks;

using System.Windows.Threading;

public class Program

{

    public static void Main()

    {

        var result = Threadedthing.Instance.GetThing();

            Console.WriteLine(result);

    }

}

​

public class Threadedthing

    {

        private static Threadedthing _instance;

        private static object _instanceLock = new object();

        public static Threadedthing Instance

        {

            get

            {

                if (_instance == null)

                {

                    lock (_instanceLock)

                    {

                        if (_instance == null)

                        {

                            _instance = new Threadedthing();

                        }

                    }

                }

​

                return _instance;

            }

        }

​

        private Thread _thread;

        private Dispatcher _dispatcher;

​

        private Threadedthing()

        {

            var tcs = new TaskCompletionSource<Dispatcher>();

            _dispatcher = System.Windows.Threading.Dispatcher.CurrentDispatcher;

            _thread = new Thread(new ThreadStart(() => { tcs.SetResult(Dispatcher.CurrentDispatcher);}));

            _thread.Start();

​

        }

​

        public string GetThing()

        {

            if (Thread.CurrentThread != _thread)

            {

                return _dispatcher.Invoke<string>(GetThing1);

            }

​

            return "woo";

        }

        public string GetThing1()

        {

            return "woo2";

        }

    }