WPF中绘图（含调用GDI+）

private void DrawStuff()
        {
            //
            //if (buffer == null)
            //{
            //    buffer = new RenderTargetBitmap((int)Background.Width, (int)Background.Height, 96, 96, PixelFormats.Pbgra32);
            //    Background.Source = buffer;
            //    return;
            //}
            //using (DrawingContext drawingContext = drawingVisual.RenderOpen())
            //{
            //    drawingContext.DrawRectangle(new SolidColorBrush(Colors.Red), null, new Rect(0, 0, 10, 10));
            //}
            //buffer.Render(drawingVisual);
        }

        private void DrawImage() {
            //
            // layoutDocumentMapContainer
            //if (dockPanelMapContainer.ActualWidth <1 || dockPanelMapContainer.ActualHeight < 1 || this.Background == null)
            //{
            //    return;
            //}
            //using (Bitmap bitmap = new Bitmap((int)dockPanelMapContainer.ActualWidth, (int)dockPanelMapContainer.ActualHeight))
            //{
            //    this.Background.Visibility = Visibility.Visible;
            //    this.Background.Width = (double)bitmap.Width;
            //    this.Background.Height = (double)bitmap.Height;
            //    Graphics graphics = Graphics.FromImage(bitmap);
            //    graphics.FillRectangle(new System.Drawing.SolidBrush(System.Drawing.Color.Blue), new RectangleF(0, 0, (float)(dockPanelMapContainer.ActualWidth - 0), (float)(dockPanelMapContainer.ActualHeight - 0)));
            //    MemoryStream memoryStream = new MemoryStream();
            //    bitmap.Save(memoryStream, ImageFormat.Png);
            //    memoryStream.Position = 0L;
            //    BitmapImage bitmapImage = new BitmapImage();
            //    bitmapImage.BeginInit();
            //    bitmapImage.StreamSource = memoryStream;
            //    bitmapImage.EndInit();
            //    this.Background.Source = bitmapImage;
            //    graphics.Dispose();
            //    graphics = null;
            //}
        }