[DarkMode] TaskDialogs should respond to System: DarkMode and Application's SystemColorMode.Dark

[Olina-Zhang]

.NET version

9.0.100-rc.2.24455.8

Did it work in .NET Framework?

No

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

No

Issue description

2 cases:

1. TaskDilaogs are not in dark mode when enabled Dark mode in System and setting Application.SetColorMode(SystemColorMode.System)

SystemDarkMode.mp4

2. TaskDialogs are not in dark mode when setting Application.SetColorMode(SystemColorMode.Dark)

AppDarkMode.mp4

Steps to reproduce

TaskDialogSamples.zip

[AraHaan]

Is there still time to get a fix in for this? I need this fix for .NET 10 as soon as possible.

[fubar-coder]

Here is a C++ implementation für a dark mode TaskDialog, which shows that it can be done: https://github.com/SFTRS/DarkTaskDialog

[AraHaan]

Or Winforms could just use that C++ Implementation for it ^

[AraHaan]

Imma try to see if I can get to work on this locally, I have started to migrate to TaskDialogs in my programs and part of that reason is I want Dark Mode Task Dialogs to come out-of-the-box with none of the application code doing the dark code work.

[RussKie]

Or Winforms could just use that C++ Implementation for it ^

I don't think it is something Windows Forms runtime can do.

[AraHaan]

Or Winforms could just use that C++ Implementation for it ^

I don't think it is something Windows Forms runtime can do.

unless winforms decides to add in their own custom C++ code, but then what would be the point in generating the p/invoke bindings the the various system dlls what that custom C++ code could proxy those syscalls and winforms end up just p/invoking those.

[mcka-dev]

I just checked whether the bug is fixed in .NET 10.0.0-rc.1. No, all the dialogs are still light. I’m really worried that the official .NET 10 release is coming soon (less than two months left), and the bug will stay with us for a long time — which is really sad :(((

[memoarfaa]

Hi @RussKie @fubar-coder @KlausLoeffelmann @JeremyKuhne @merriemcgaw
There is new soultion Now UIA + subclassing + UxTheme With fully decumented Api
you can look a C++ implementation For it
https://github.com/memoarfaa/DarkTaskDialog-Native

2026-03-13_13-32-42.mp4