C# 10 - Issues with Event Handling and Memory Leaks in WPF Applications
I'm working on a WPF application using C# 10, and I've encountered a frustrating issue with memory leaks related to event handling. I have a user control that subscribes to a few events from its parent window, but when I close the window, I notice that the memory usage doesn't drop as expected. I've confirmed that the user control is being removed from the visual tree, but I suspect that the event handlers are still holding references, preventing garbage collection. Here's a simplified version of my code: ```csharp public partial class MyUserControl : UserControl { public MyUserControl() { InitializeComponent(); this.Loaded += OnLoaded; } private void OnLoaded(object sender, RoutedEventArgs e) { var parentWindow = Window.GetWindow(this); if (parentWindow != null) { parentWindow.SomeEvent += OnSomeEvent; } } private void OnSomeEvent(object sender, EventArgs e) { // Handle the event } private void UnsubscribeEvents() { var parentWindow = Window.GetWindow(this); if (parentWindow != null) { parentWindow.SomeEvent -= OnSomeEvent; } } protected override void OnUnloaded(RoutedEventArgs e) { UnsubscribeEvents(); base.OnUnloaded(e); } } ``` I've added an `OnUnloaded` method to unsubscribe from events, but the memory usage still seems high after closing the window. I've also run a memory profiler, and it shows that the instances of `MyUserControl` are still in memory, along with their event handlers. I've tried using weak event patterns and explicitly nullifying the event delegates, but none of those approaches have resolved the issue. Could there be something I'm missing in how I'm managing the event subscriptions, or is there a better pattern to utilize in a WPF application to prevent these memory leaks with event handlers? Any insights would be appreciated! My development environment is Windows. My development environment is Windows. Am I missing something obvious? I'm developing on macOS with C#. Hoping someone can shed some light on this.