Raster zeichnen

private void DrawPixels()

        {

            double xPos;

            double yPos;

            DrawingVisual dv = new DrawingVisual();

            using (DrawingContext dc = dv.RenderOpen())

            {

                for (int y = 0; y < MainGrid.ActualHeight; y++)

                {

                    for (int x = 0; x < MainGrid.ActualWidth; x++)

                    {

                        xPos = Convert.ToDouble(x);

                        yPos = Convert.ToDouble(y);

                        if (x % 2 == 0)

                            dc.DrawRectangle(Brushes.White, null, new Rect(xPos, yPos, 1, 1));

                        else

                            dc.DrawRectangle(Brushes.Black, null, new Rect(xPos, yPos, 1, 1));                      

                    }

                }

                dc.Close();                

            }

            RenderTargetBitmap rtb = new RenderTargetBitmap(400, 400, 96, 96, PixelFormats.Pbgra32);

            rtb.Render(dv);

            Image img = new Image();

            img.Source = rtb;

            this.MainGrid.Children.Add(img);

        }