I'm trying to reproduce the problem with the ControlGallery and after switching between samples I see the memory growing, but after Garbage Collector kicks in memory is returned to the system.
Are you sure the memory keeps growing forever?

I think I have located the problem, the problem is not when you load the xaml's as in the control gallery sample but when you use a UserControl and the inside a user control you use Noesis.GUI.LoadComponent.
I have uploaded a small sample.
When you switch multiple time between the two view you can see that the memory usage grows but when you click the button for garbage collection (it calls GC.Collect) the memory is not deallocated.

Thanks for the project ivan... I'm investigating the issue.

Hi ivan,

The problem is related to the event hook (Initialized in your example).

Our current implementation requires to store the event handler in a static dictionary to communicate with native code. This is causing the delegate Target to remain strongly referenced and object is not released.
We know about this problem but the right solution is not totally clear as we don't want to harm event performance.

In your scenario this problem can be workaround by manually unregistering from the events when control is removed from the tree:

namespace NoesisBug

{

public class Menu : UserControl

{

public Menu()

{

this.Initialized += OnInitialized;

this.Unloaded += OnUnloaded;

this.InitializeComponent();

}

    private void InitializeComponent()
    {
        Noesis.GUI.LoadComponent(this, "Assets/MemoryBug/Menu.xaml");
    }

    private void OnInitialized(object sender, EventArgs args)
    {
    }

    private void OnUnloaded(object sender, RoutedEventArgs e)
    {
        Initialized -= OnInitialized;
        Unloaded -= OnUnloaded;
    }
}
}

Thanks for the help.

I don't mind if it stays this way :).

I found another simple way to break the strong reference, to allow memory to be correctly disposed.
Instead of unregistering from the events, use an intermediate weak reference:

namespace NoesisBug

{

public class Menu : UserControl

{

public Menu()

{

WeakReference weak = new WeakReference(this);

this.MouseDown += (s, e) => { ((Menu)weak.Target)?.OnMouseDown(s, e); };

        this.InitializeComponent();
    }

    private void InitializeComponent()
    {
        Noesis.GUI.LoadComponent(this, "Assets/MemoryBug/Menu.xaml");
    }

    private void OnMouseDown(object sender, MouseButtonEventArgs args)
    {
    }
}
}