dotnet/winforms

[Dark Mode] The BackColor of the ProgressBar control should not be changed

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#11,938 opened on Aug 20, 2024

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area-DarkModehelp wanted

Description

.NET version

9.0.100-rc.1.24418.2 + build private dll from winforms repo main 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

In Dark Mode, the BackColor of the ProgressBar control will change to red when its BackColor property is set to red The BackColor of the ProgressBar will not be changed in Classic Mode

Dark Mode image

Classic Mode image

Steps to reproduce

  1. Create a WinForms .NET Core application with ProgressBar control
  2. Enable DarkMode by Application.SetColorMode(SystemColorMode.Dark) in Program.cs file
  3. Set the BackColor property of the ProgressBar to red
  4. Run the application

Contributor guide

Tech stack
csharp
Domain
desktop
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-2 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
C#Windows Forms
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
50
Research direction
Investigate the ProgressBar control's BackColor property handling in dark mode. The issue is likely in the ProgressBarRenderer or the control's OnPaint method, as referenced in PR #11857. Ensure that when BackColor is explicitly set, it is not overridden by dark mode theming. The code for ProgressBar painting is in the System.Windows.Forms.ProgressBar class, and the dark mode color management is in the System.Windows.Forms.VisualStyles namespace.
[Dark Mode] The BackColor of the ProgressBar control should not be changed · dotnet/winforms#11938 | Good First Issue