MxMxM

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();
}

private void Application_UnhandledException(object sender, ApplicationUnhandledExceptionEventArgs e)
 {
    if (System.Diagnostics.Debugger.IsAttached)
    {
       System.Diagnostics.Debugger.Break();
    }
     e.Handled = true;
     ErrorPage.Exception = e.ExceptionObject;
     (RootVisual as Microsoft.Phone.Controls.PhoneApplicationFrame).Source = new Uri("/XXX.xaml", UriKind.Relative);
    //xxx.xaml就是重定向到的页面。可以是出错提示页，也可以是其他功能(比如让用户选择进入某一页面)。
}