MARKUS

    public class MyConsole

    {

        private readonly System.Threading.ManualResetEvent _readLineSignal;

        private string _lastLine;

        public MyConsole()

        {

            _readLineSignal = new System.Threading.ManualResetEvent(false);

            Gui = new TextBox();

            Gui.AcceptsReturn = true;

            Gui.KeyUp += OnKeyUp;

        }

        private void OnKeyUp(object sender, KeyEventArgs e)

        {

            // this is always fired on UI thread

            if (e.Key == Key.Enter)

            {

                // quick and dirty, but that is not relevant to your question

                _lastLine = Gui.Text.Split(new string[] { "\r\n" }, StringSplitOptions.RemoveEmptyEntries).Last();

                // now, when you detected that user typed a line, set signal

                _readLineSignal.Set();

            }

        }

        public TextBox Gui { get; private set; }

        public string ReadLine()

        {

            // that should always be called from non-ui thread

            if (Gui.Dispatcher.CheckAccess())

                throw new Exception("Cannot be called on UI thread");

            // reset signal

            _readLineSignal.Reset();

            // wait until signal is set. This call is blocking, but since we are on non-ui thread - there is no problem with that

            _readLineSignal.WaitOne();

            // we got signalled - return line user typed.

            return _lastLine;

        }

        public void WriteLine(string line)

        {

            if (!Gui.Dispatcher.CheckAccess())

            {

                Gui.Dispatcher.Invoke(new Action(() => WriteLine(line)));

                return;

            }

            Gui.Text += line + Environment.NewLine;

        }

    }

            //var console = new MyConsole();

            //this.Content = console.Gui;

            //var read = console.ReadLine();

            //console.WriteLine(read);