WPF - C-Sharp - Buttons mit Thread bearbeiten

public partial class ProcessingPage : Page
{
        private FileInfo file;
        public Thread thread { get; }

        public ProcessingPage(FileInfo file)
        {
            InitializeComponent();
            this.window = window;
            this.file = file;
            textblock.Text = file.FullName;

            thread = new Thread(new ThreadStart(Wait_FileSaved));
            thread.Start();
        }


        /// <summary>
        /// Waits until the file has been edited
        /// </summary>
        /// <param name="file">file to get processed</param> 
        private void Wait_FileSaved()
        {
            Console.WriteLine("{0} | {1}", file.LastWriteTimeUtc, new FileInfo(file.FullName).LastWriteTimeUtc);  
            while (file.LastWriteTimeUtc.Equals(new FileInfo(file.FullName).LastWriteTimeUtc))
            {
                Thread.Sleep(2000);
            }
            Console.WriteLine("Datei geändert");  
            //Write-Log
            EnableButtons(btnChecked, btnDenied, btnDenied, btnPreChecked, btnClarify, btnPass);
        }
}

private bool EnableButtons(params Button[] buttons)
        {
            if (!this.Dispatcher.CheckAccess())
                return (bool)this.Dispatcher.Invoke((Func<Button[], bool>)EnableButtons, buttons);   xxxxxxxxxxxxxxx
            foreach (Button button in buttons)
                button.IsEnabled = true;
            return true;
        }