Hi,

I am using the PdfViewer in a custom control that allows users to resize the pdfViewer with a GridSplitter. I am finding that when a user resizes too much too quickly, the memory usage skyrockets and I end up getting a OutOfMemoryException:

System.OutOfMemoryException: Insufficient memory to continue the execution of the program.
at System.Windows.Media.Imaging.WriteableBitmap..ctor(Int32 pixelWidth, Int32 pixelHeight, Double dpiX, Double dpiY, PixelFormat pixelFormat, BitmapPalette palette)
at Patagames.Pdf.Net.Controls.Wpf.PdfViewer.DrawCanvasToContext(DrawingContext drawingContext, Int32 cw, Int32 ch, Boolean allPagesAreRendered)
at Patagames.Pdf.Net.Controls.Wpf.PdfViewer.OnRender(DrawingContext drawingContext)
at System.Windows.UIElement.Arrange(Rect finalRect)
at System.Windows.ContextLayoutManager.UpdateLayout()
at System.Windows.ContextLayoutManager.UpdateLayoutCallback(Object arg)
at System.Windows.Media.MediaContext.InvokeOnRenderCallback.DoWork()
at System.Windows.Media.MediaContext.FireInvokeOnRenderCallbacks()
at System.Windows.Media.MediaContext.RenderMessageHandlerCore(Object resizedCompositionTarget)
at System.Windows.Media.MediaContext.RenderMessageHandler(Object resizedCompositionTarget)
at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)

Is this simply a limitation of the PdfViewer? Or is there something I can do on my end to limit the amount of memory used when the PdfViewer resizes?
I am using version 3.2.3.0 of the Pdfium.NET SDK.

Hi Paul,

Thank you for the direction. So I downloaded the the latest version, yet I am still getting the out of memory exception if I resize too rapidly.

I did notice I needed to use the x32 pdfium.dll instead of the x64 one. The x64 one couldn't be found when Initialize was called but the x32 one could. I would guess because of the license key? But I'm not sure if this would have any effect seeing as the error seems directly related to the PdfViewer.

I also noticed that the Patagames.Pdf.Wpf.dll was version 3.5.5.0, not 3.7.4.2704 as the rest of the libraries which also surprised me a little.