using System.Windows.Media.Imaging;using System.IO;using Microsoft.Xna.Framework.Media;

public void CaptureScreen(object sender, EventArgs e){    WriteableBitmap bmp = new WriteableBitmap(480, 800);    bmp.Render(App.Current.RootVisual, null);    bmp.Invalidate();    MemoryStream stream = new MemoryStream();    bmp.SaveJpeg(stream, bmp.PixelWidth, bmp.PixelHeight, 0, 80);    stream.Seek(0, SeekOrigin.Begin);    MediaLibrary library = new MediaLibrary();    string fileName = "ScreenShot_" + DateTime.Now.ToString("yyyy-mm-dd_hh:mm:ss");    library.SavePicture(fileName, stream);    stream.Close();    Dispatcher.BeginInvoke(() =>    {        PictureCollection picCollection = library.Pictures;        foreach (Picture item in picCollection)        {            if (item != null)            {                BitmapImage bitmap = new BitmapImage();                bitmap.SetSource(item.GetImage());            }        }    });}