Как сделать скриншот экрана?

        public byte[] Take() {
            int screenWidth = Convert.ToInt32(SystemParameters.VirtualScreenWidth);
            int screenHeight = Convert.ToInt32(SystemParameters.VirtualScreenHeight);
            int screenLeft = Convert.ToInt32(SystemParameters.VirtualScreenLeft);
            int screenTop = Convert.ToInt32(SystemParameters.VirtualScreenTop);
 
            RenderTargetBitmap renderTarget = new RenderTargetBitmap(screenWidth, screenHeight, 96, 96, PixelFormats.Pbgra32);
            VisualBrush sourceBrush = new VisualBrush();
 
            DrawingVisual drawingVisual = new DrawingVisual();
            DrawingContext drawingContext = drawingVisual.RenderOpen();
 
            using(drawingContext) {
                drawingContext.PushTransform(new ScaleTransform(1, 1));
                drawingContext.DrawRectangle(sourceBrush, null, new Rect(new Point(0, 0), new Point(screenWidth, screenHeight)));
            }
            renderTarget.Render(drawingVisual);
 
            PngBitmapEncoder pngEncoder = new PngBitmapEncoder();
            pngEncoder.Frames.Add(BitmapFrame.Create(renderTarget));
 
            Byte[] _imageArray;
 
            using(MemoryStream outputStream = new MemoryStream()) {
                pngEncoder.Save(outputStream);
                _imageArray = outputStream.ToArray();
            }
 
 
            return _imageArray;
        }

using System.Drawing;
using System.Drawing.Imaging;
using System.Windows.Forms;

private static BitmapSource CopyScreen()
{
    var left = Screen.AllScreens.Min(screen => screen.Bounds.X);
    var top = Screen.AllScreens.Min(screen => screen.Bounds.Y);
    var right = Screen.AllScreens.Max(screen => screen.Bounds.X + screen.Bounds.Width);
    var bottom = Screen.AllScreens.Max(screen => screen.Bounds.Y + screen.Bounds.Height);
    var width = right - left;
    var height = bottom - top;
 
    using (var screenBmp = new Bitmap(width, height, System.Drawing.Imaging.PixelFormat.Format32bppArgb))
    {
        using (var bmpGraphics = Graphics.FromImage(screenBmp))
        {
            bmpGraphics.CopyFromScreen(left, top, 0, 0, new System.Drawing.Size(width, height));
            return Imaging.CreateBitmapSourceFromHBitmap(
                screenBmp.GetHbitmap(),
                IntPtr.Zero,
                Int32Rect.Empty,
                BitmapSizeOptions.FromEmptyOptions());
        }
    }
}

new Bitmap
 
using System.Drawing.Imaging;
using System.Windows.Forms;

....
using System.Drawing;
using System.Windows.Forms;
using System.Windows.Interop;
 
namespace WpfApplication1
{
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }
 
        private void Button_Click(object sender, RoutedEventArgs e)
        {
            System.Windows.Controls.Image img = new System.Windows.Controls.Image();
            img.Source = CopyScreen();
            canvas.Children.Add(img);
 
        }
        private BitmapSource CopyScreen()
        {
            var left = Screen.AllScreens.Min(screen => screen.Bounds.X);
            var top = Screen.AllScreens.Min(screen => screen.Bounds.Y);
            var right = Screen.AllScreens.Max(screen => screen.Bounds.X + screen.Bounds.Width);
            var bottom = Screen.AllScreens.Max(screen => screen.Bounds.Y + screen.Bounds.Height);
            var width = right - left;
            var height = bottom - top;
 
            using (var screenBmp = new Bitmap(width, height, System.Drawing.Imaging.PixelFormat.Format32bppArgb))
            {
                using (var bmpGraphics = Graphics.FromImage(screenBmp))
                {
                    bmpGraphics.CopyFromScreen(left, top, 0, 0, new System.Drawing.Size(width, height));
                    return Imaging.CreateBitmapSourceFromHBitmap(
                        screenBmp.GetHbitmap(),
                        IntPtr.Zero,
                        Int32Rect.Empty,
                        BitmapSizeOptions.FromEmptyOptions());
                }
            }
        }
    }
}