[Dark Mode] Control pops up dialogs and MessageBox window are not in Dark mode when DarkMode enabled

[Philip-Wang01]

.NET version

.NET SDK 9.0.100-rc.1.24415.1 + build private dll form winforms repo release/9.0 branch

Did it work in .NET Framework?

No

Did it work in any of the earlier releases of .NET Core or .NET 5+?

This is a new feature Dark Mode: https://github.com/dotnet/winforms/pull/11857

Issue description

Control pops up dialogs and MessageBox window are not in Dark mode when DarkMode enabled

ColorDialog:

FontDialog:

MessageBox:

Steps to reproduce

1. Create a WinForms .NET Core application.
2. Enable DarkMode by Application.SetColorMode(SystemColorMode.Dark) in program.cs file.
3. Add three button controls to the form designer.
4. Add click events to open FontDialog, ColorDialog and MessageBox for each of the three buttons.
5. Run the application.
6. Click each of the three buttons and observe the color of the new dialog.

[KlausLoeffelmann]

This is currently by design. This is nothing, that we would address right now, even if we could potentially change that. For type editors, we need to address them over time anyway to make dark mode work for VS. My suggestion is that we would port those then back to the runtime and make them dark mode aware. But this has nothing to do with the dark mode not working in this case, this is more that we would need to introduce dark mode ability in our own infra over time. So, those are not bugs but actually to do issues.

When dialogs are triggered directly by the system, however, that it's not in our hands. Windows does the same, like this dialog in the File Explorer. Thay are migrating to dark mode or a new UI approach over time:

So: Color Dialog and Font Dialog, we could potentially address. The MessageBox is what it is. We could think about a way of styling the TaskDialog - I haven't looked into that, yet.

[memoarfaa]

@KlausLoeffelmann

So: Color Dialog and Font Dialog, we could potentially address. The MessageBox is what it is. We could think about a way of styling the TaskDialog - I haven't looked into that, yet.

Are you Sure that The MessageBox is what it is and we cannot apply dark mode to it ?

https://github.com/user-attachments/assets/e0b1f9bd-4bbd-4869-a53b-57d43a0f60d5

[dotnet-policy-service[bot]]

This issue is now marked as "help wanted", and we’re looking for a community volunteer to work on this issue. If we receive no interest in 180 days, we will close the issue. To learn more about how we handle feature requests, please see our documentation.

Happy Coding!