WPF Cover Flow Tutorial : Part 8

I've been told that Part 7 had memory leaks. In the comments, I link a blog article describing how to study memory leaks : you can watch the Private Bytes performance counter.

We need :

• The performance counter
• A callback displaying the counter value
• A timer

using System.Diagnostics;
using System.Windows.Threading;

private readonly PerformanceCounter counter = GetCounter();
private readonly DispatcherTimer timer = new DispatcherTimer();

private void timer_Tick(object sender, EventArgs e)
{
    long kb = Convert.ToInt64(counter.NextValue() / 1000);
    perfLabel.Content = string.Format("{0,12} KB", kb.ToString("###.###.###"));
}
private static PerformanceCounter GetCounter()
{
    var counter = new PerformanceCounter();
    counter.CategoryName = "Process";
    counter.CounterName = "Private Bytes";
    counter.InstanceName = Process.GetCurrentProcess().ProcessName;
    return counter;
}
public TestWindow()
{
    ...
    timer.Tick += timer_Tick;
    timer.Interval = TimeSpan.FromMilliseconds(100);
    timer.Start();
}

<Grid>
    ...
    <Label Content="0 KB" Height="23" HorizontalAlignment="Left" Margin="12,12,0,0" Name="perfLabel" VerticalAlignment="Top" Width="142" Foreground="Red" />
</Grid>

Here is the result in video.

Current implementation always stay close to 90 KB :


If we comment out Cover Destroy method:

public void Destroy()
{
    //visualModel.Children.Remove(this);
}

The counter grows continuously :



Note : the ThumbnailManager does not handle empty image files. Loading such a file would throw an OutOfMemoryException.
Edit 2014-02-23 : Code has moved to github.