System.Threading.Thread.SetApartmentState C# (CSharp) Метод

        public void SetApartmentState(System.Threading.ApartmentState state)
        {
        }

        public void CreateBitmap()
        {
            int width = 100;
            int height = 100;
            int dpi = 96;

            Tracing.Log(">> CreateBitmap");
            var thread = new Thread(new ThreadStart(() => 
            {
                Tracing.Log(">> CreateBitmap - Thread start; creating drawing visual");
                //Dispatcher.Invoke(new Action(() => {
                _drawingVisual = new DrawingVisual();
                _drawingContext = _drawingVisual.RenderOpen();
                //}));

                Tracing.Log(">> CreateBitmap - Drawing to context");
                _drawingContext.DrawRectangle(new SolidColorBrush(Colors.HotPink), new Pen(), new Rect(0, 0, 50, 50));
                _drawingContext.DrawRectangle(new SolidColorBrush(Colors.Blue), new Pen(), new Rect(50, 0, 50, 50));
                _drawingContext.DrawRectangle(new SolidColorBrush(Colors.Orange), new Pen(), new Rect(0, 50, 50, 50));
                _drawingContext.DrawRectangle(new SolidColorBrush(Colors.DarkRed), new Pen(), new Rect(50, 50, 50, 50));
                _drawingContext.Close();

                Tracing.Log(">> CreateBitmap - Finished drawing; creating render target bitmap");
                _bitmap = new RenderTargetBitmap(width, height, dpi, dpi, PixelFormats.Default);
                _bitmap.Render(_drawingVisual);
                Tracing.Log(">> CreateBitmap - Finished work");
                _bitmap.Freeze();
            }));
            //thread.IsBackground = true;
            thread.SetApartmentState(ApartmentState.STA);
            thread.Start();
        }