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PDF Memory leak?

Thread ID:





123871 Apr 28,2016 03:18 AM Apr 29,2016 09:12 AM UWP 2
Tags: Pdf
Romane Donnet
Asked On April 28, 2016 03:18 AM

Hi there!

Just began on syncfusion PDF and wanted to ask a quick question :

I'm trying to generate a large amount of pages into a PDF. Here's my code :

        private async void Button_Click(object sender, RoutedEventArgs e)
            var watch = System.Diagnostics.Stopwatch.StartNew();
            PdfDocument doc = new PdfDocument();
            doc.EnableMemoryOptimization = true;

            for (int i = 0; i < 5000; i++){
                await GeneratePDF(doc, i);
                Debug.WriteLine("doc " + i.ToString());

            using (MemoryStream stream = new MemoryStream()){
                await doc.SaveAsync(stream);

                var elapsedMs = watch.ElapsedMilliseconds;
                Debug.WriteLine("generation in " + elapsedMs.ToString() + "ms");

                StorageFolder local = Windows.Storage.ApplicationData.Current.LocalFolder;
                StorageFile stFile = await local.CreateFileAsync("test.pdf", CreationCollisionOption.ReplaceExisting);
                using (Windows.Storage.Streams.IRandomAccessStream fileStream = await stFile.OpenAsync(FileAccessMode.ReadWrite)){
                    using (Stream st = fileStream.AsStreamForWrite()){
                        st.Write((stream as MemoryStream).ToArray(), 0, (int)stream.Length);

        public async Task GeneratePDF(PdfDocument doc,int index)
            PdfPage page = doc.Pages.Add();
            PdfGraphics g = page.Graphics;
            PdfBrush brush = new PdfSolidBrush(System.Drawing.Color.FromArgb(255, 0, 0, 0));
            PdfFont font = new PdfStandardFont(PdfFontFamily.Helvetica, 36);
            for(int i = 0;i < 1000; i++){
                g.DrawString("Hello world!", font, brush, new PointF(20, 20+i));

And here's what i'm seeing with the memory :

How can I free up the RAM after the generation?

Romane Donnet
Replied On April 28, 2016 03:24 AM

Apparently the image doesn't load in the forum

Memory Leak image

Chinnu Muniyappan [Syncfusion]
Replied On April 29, 2016 09:12 AM

Hi Donnet, 

Thank you for contacting Syncfusion support. 

We have created a simple sample without using any of the syncfusion assemblies, and here also we getting the same memory behavior , so we suspect this the actual behavior of the visual studio diagnosing tool, please refer the below sample for more details. 

And also we have tried your sample to ANTS Memory Profiler, we are not getting any memory leak, please refer the below screenshot. 

Please let us know if you have any concern. 



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