👀 Views: 28 💬 Answers: 1 📅 Created: 2025-10-05

c# .net-6 winforms event-handling migration C#

After trying multiple solutions online, I still can't figure this out... During development for a legacy WinForms application that I am migrating to .NET 6, I've run into a frustrating issue with event handling. The original application relied heavily on event-based patterns, and after migrating, some events no longer trigger as expected. In the original code, there is a series of custom controls that utilize events to update the UI based on user interactions. Here's an example of a button click handler: ```csharp private void btnSave_Click(object sender, EventArgs e) { // Logic to save data OnDataSaved(); } ``` The `OnDataSaved` method raises a custom event, but after migration, it seems that the event handler subscription is lost somewhere in the process. Previously, the subscription looked like this: ```csharp myControl.DataSaved += new EventHandler(MyControl_DataSaved); ``` After migration, I've ensured that the event handling is retained, yet I'm seeing no callbacks being triggered. I added logging inside the `OnDataSaved` method, and it doesn't fire at all when the button is clicked. I checked for differences in how event subscriptions are managed in .NET 6 compared to .NET Framework, but I haven't found anything that could explain this behavior. As a troubleshooting step, I created a simple test project with a button and ensured the event fires correctly. It works perfectly there. In my legacy code, I also suspect that some of the visual inheritance from a base form might be complicating things. I've tried explicitly re-subscribing to events in the constructor of my form, but that hasn’t fixed the issue either. Here’s how I tried to re-subscribe: ```csharp public MyForm() { InitializeComponent(); myControl.DataSaved += MyControl_DataSaved; } ``` The above still doesn’t trigger the `MyControl_DataSaved` method when the button is clicked. I also validated that `myControl` is not null and is instantiated correctly. To narrow it down, I profiled the application and saw the event handler never gets registered properly. Has anyone faced similar issues when migrating event-driven architectures in WinForms projects? Any guidance on what I might be missing or best practices for ensuring event subscriptions persist after migration would be greatly appreciated. I'm working on a microservice that needs to handle this. What would be the recommended way to handle this?