RadBarcodeQR doesn't work in code-behind

[Sergiy]

Hello, I am trying to get byte code of QR but I faced issue.
It's standard sample from telerik

var qRCode = new RadBarcodeQR();
qRCode.ErrorCorrectionLevel = QRClassLibrary.Modes.ErrorCorrectionLevel.H;
qRCode.Mode = QRClassLibrary.Modes.CodeMode.Byte;
qRCode.Version = 2;

qRCode.Text = "TestText";

const string extension = "png";
var dialog = new SaveFileDialog()
{
    DefaultExt = extension,
    FileName = "QRBarCode",
    Filter = "Png (*.png)|*.png"
};

if (dialog.ShowDialog() == true)
{
    using (var stream = dialog.OpenFile())
    {
        ExportExtensions.ExportToImage(qRCode, stream, new PngBitmapEncoder());
    }
}

But I have got the next Exception 

The parameter value must be greater than zero.
Parameter name: pixelWidth

   at System.Windows.Media.Imaging.RenderTargetBitmap..ctor(Int32 pixelWidth, Int32 pixelHeight, Double dpiX, Double dpiY, PixelFormat pixelFormat)
   at Telerik.Windows.Media.Imaging.ExportHelper.GetBitmapSource(FrameworkElement element, Double dpiX, Double dpiY) in c:\TB\221\WPF_Scrum\Release_WPF\Sources\Development\Core\Controls\ExportExtensions\ExportHelper.cs:line 97
   at Telerik.Windows.Media.Imaging.ExportHelper.GetElementImage(FrameworkElement element) in c:\TB\221\WPF_Scrum\Release_WPF\Sources\Development\Core\Controls\ExportExtensions\ExportHelper.cs:line 70
   at Telerik.Windows.Media.Imaging.ImageExporter.Export(FrameworkElement element, Stream stream, BitmapEncoder encoder) in c:\TB\221\WPF_Scrum\Release_WPF\Sources\Development\Core\Controls\ExportExtensions\ImageExporter.cs:line 12
   at Telerik.Windows.Media.Imaging.ExportExtensions.ExportToImage(FrameworkElement element, Stream stream, BitmapEncoder encoder) in c:\TB\221\WPF_Scrum\Release_WPF\Sources\Development\Core\Controls\ExportExtensions\ExportExtensions.cs:line 100
   at WpfApplication1.MainWindow.ButtonBase_OnClick(Object sender, RoutedEventArgs e) in c:\Users\smile\Documents\Visual Studio 2012\Projects\WpfApplication1\WpfApplication1\MainWindow.xaml.cs:line 352
   at System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs)
   at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
   at System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args)
   at System.Windows.UIElement.RaiseEvent(RoutedEventArgs e)
   at System.Windows.Controls.Primitives.ButtonBase.OnClick()
   at System.Windows.Controls.Button.OnClick()
   at System.Windows.Controls.Primitives.ButtonBase.OnMouseLeftButtonUp(MouseButtonEventArgs e)
   at System.Windows.UIElement.OnMouseLeftButtonUpThunk(Object sender, MouseButtonEventArgs e)
   at System.Windows.Input.MouseButtonEventArgs.InvokeEventHandler(Delegate genericHandler, Object genericTarget)
   at System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target)
   at System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs)
   at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
   at System.Windows.UIElement.ReRaiseEventAs(DependencyObject sender, RoutedEventArgs args, RoutedEvent newEvent)
   at System.Windows.UIElement.OnMouseUpThunk(Object sender, MouseButtonEventArgs e)
   at System.Windows.Input.MouseButtonEventArgs.InvokeEventHandler(Delegate genericHandler, Object genericTarget)
   at System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target)
   at System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs)
   at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
   at System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args)
   at System.Windows.UIElement.RaiseTrustedEvent(RoutedEventArgs args)
   at System.Windows.UIElement.RaiseEvent(RoutedEventArgs args, Boolean trusted)
   at System.Windows.Input.InputManager.ProcessStagingArea()
   at System.Windows.Input.InputManager.ProcessInput(InputEventArgs input)
   at System.Windows.Input.InputProviderSite.ReportInput(InputReport inputReport)
   at System.Windows.Interop.HwndMouseInputProvider.ReportInput(IntPtr hwnd, InputMode mode, Int32 timestamp, RawMouseActions actions, Int32 x, Int32 y, Int32 wheel)
   at System.Windows.Interop.HwndMouseInputProvider.FilterMessage(IntPtr hwnd, WindowMessage msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
   at System.Windows.Interop.HwndSource.InputFilterMessage(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
   at MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
   at MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o)
   at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
   at MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(Object source, Delegate method, Object args, Int32 numArgs, Delegate catchHandler)
   at System.Windows.Threading.Dispatcher.LegacyInvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Int32 numArgs)
   at MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam)
   at MS.Win32.UnsafeNativeMethods.DispatchMessage(MSG& msg)
   at System.Windows.Threading.Dispatcher.PushFrameImpl(DispatcherFrame frame)
   at System.Windows.Threading.Dispatcher.PushFrame(DispatcherFrame frame)
   at System.Windows.Threading.Dispatcher.Run()
   at System.Windows.Application.RunDispatcher(Object ignore)
   at System.Windows.Application.RunInternal(Window window)
   at System.Windows.Application.Run(Window window)
   at System.Windows.Application.Run()
   at WpfApplication1.App.Main() in c:\Users\smile\Documents\Visual Studio 2012\Projects\WpfApplication1\WpfApplication1\obj\Debug\App.g.cs:line 0
   at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args)
   at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
   at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
   at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
   at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
   at System.Threading.ThreadHelper.ThreadStart()


What am I doing wrong?
I need to get the byte[] of image source (QR, BaCode and so on), could you give me sample of code what I need to do, please? (NOT LINK, I want to see a working example)
Thank You

[Yavor]

Hello,

I tested the code which you included, and it worked as expected.
If the issue which you reported persists, please open a formal support ticket, and send us a small application, which replicates the issue. We will review it and get back to you with more information on the matter.

Regards,
Yavor
Telerik

[Sajid]

Hi I am also trying to generate QR code from code behind and trying to insert in RadDocument and when I try to export to image then same exception occurs value must be non-zero. here is my sample code. Please suggest the way forward this is very import for us.

 Telerik.Windows.Controls.RadBarcodeQR QrCode = new Telerik.Windows.Controls.RadBarcodeQR()
                                {
                                    Text = "HelloWorld123",
                                    Mode = QRClassLibrary.Modes.CodeMode.Byte,
                                    Version = 2,
                                    ErrorCorrectionLevel = QRClassLibrary.Modes.ErrorCorrectionLevel.H,
                                    Width = 200,
                                    Height=200,
                                    }

 MemoryStream ms = new MemoryStream();
                                Telerik.Windows.Media.Imaging.ExportExtensions.ExportToImage(QrCode, ms, new System.Windows.Media.Imaging.PngBitmapEncoder());
                                editor.InsertImage(ms, "png");

[Martin Ivanov]

You can see how to export the barcode to an image, without adding it to the visual tree here:
https://docs.telerik.com/devtools/wpf/knowledge-base/kb-barcode-export-to-image