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Chart.Export memory usage


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Our application seems to suffer from a memory leak when using the Chart.Export function.  I can replicate the problem with the following code:

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Windows;

using System.Windows.Controls;

using System.Windows.Data;

using System.Windows.Documents;

using System.Windows.Input;

using System.Windows.Media;

using System.Windows.Media.Imaging;

using System.Windows.Navigation;

using System.Windows.Shapes;

using System.IO;

using ChartFX.WPF;

namespace WpfApplication1


  /// <summary>

  /// Interaction logic for Window1.xaml

  /// </summary>

  public partial class Window1 : Window


  public Window1()



  btnTest.Click += new RoutedEventHandler(btnTest_Click);


  void btnTest_Click(object sender, RoutedEventArgs e)


  for (int i = 0; i < 25; i++)


  Chart oTestChart = new Chart();

  MemoryStream ms = new MemoryStream();

  oTestChart.Export(FileFormat.Png, ms);


  oTestChart = null;






In this case, each time the button is clicked, the application's memory usage increases significantly and never seems to reduce again.  The line "oTestChart.Export(FileFormat.Png, ms);" seems to be the culprit - if I remove it the memory usage doesn't increase.

Is there any way of reclaiming the memory once the Export function has been used?  We are using ChartFX.WPF.dll version 8.0.3439.25180.

Thanks in advance!

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I've since noticed that the problem occurs when using FileFormat.Bitmap, FileFormat.Jpeg and FileFormat.Png but not when using FileFormat.Xml or FileFormat.XmlTemplate.  It occurs regardless of whether the image output is to a memory stream or a file.

Has anyone noticed this?  Is there a fix for it?

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  • 2 weeks later...

We did found a leak and it only occurred when you exported a chart that was never rendered "normally" on the screen.

You will need to download any build marked 3476 or later, additionally you will also have to manually invoke a Chart method call UnloadVisuals.

I apologize for the delay, I thought I had posted a comment to this thread.


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