Add a theme changer

[MichaelAgarkov]

Background and motivation

It would be awesome if there would be a function that will change the Control and ControlText variables to make the whole form have different themes, like a dark theme. Maybe also make it match the system settings?

Alternative Designs

• Specify the colours to anything.
• Make a "theme" collection, where forms can have multiple themes to switch through.

Risks

Some programs might use a different variable for the form or text colour, in that case it will stay the same.

Will this feature affect UI controls?

Yes, just a "Theme" selector.

[elachlan]

These Links might help:

• https://learn.microsoft.com/en-us/dotnet/desktop/winforms/controls/rendering-controls-with-visual-styles?view=netframeworkdesktop-4.8
• https://learn.microsoft.com/en-us/dotnet/api/system.windows.forms.application.enablevisualstyles?view=windowsdesktop-7.0

[merriemcgaw]

Thanks for the scenario input! We're looking into this as a possibility for .NET 9. This helps clarify how folks would like to think about the scenario #5166
I'm going to close this as a duplicate of the above.