dotnet/winforms

[Dark Mode] The Form title bar is white color when the MDIParent1 MainMenuStrip property is set to none

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#12,991 创建于 2025年2月20日

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 (2 评论) (1 反应) (1 负责人)C# (4,100 star) (922 fork)batch import
area-DarkModehelp wanted

描述

.NET version

.NET 10.0.100-preview.2.25118.3

Did it work in .NET Framework?

No

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

No, also repro in .NET 9.0 which it started to be supported.

Issue description

The Form title bar is white color when the MDIParent1 MainMenuStrip property is set to none.

Image

https://github.com/user-attachments/assets/f0a3ce9b-9f6f-45a0-a14f-52be1c43d662

Steps to reproduce

  1. Create a winforms .NET Core project.
  2. Enable DarkMode by Application.SetColorMode(SystemColorMode.Dark) in Program.cs file.
  3. Ctrl+Shift+A to add a MDI Parent Form.
  4. Set MDIParent1 MainMenuStrip property to none.
  5. Build and run MDIParent1.
  6. Click File -> New, select Window0's Maximize button.

More Info:

  1. This issue also repro when click MDI Parent button in WinformsControlTest app.

Image

贡献者指南

技术栈
csharp
领域
desktop
议题类型
bug
难度面向新贡献者的预计实现难度，1 表示很小改动，5 表示专家级工作。
3
预计时间有经验贡献者完成调查、实现、测试并准备 pull request 的粗略时间范围。
half day
活动状态议题当前的可参与程度：新鲜、活跃、陈旧、阻塞或等待维护者输入。
blocked
清晰度议题是否清楚说明期望改动、验收标准和下一步。
clear
前置要求
C#Windows FormsDark mode themingMDI
新手友好度1-100 的估计分数，表示该议题对首次贡献者的友好程度。
40
研究方向
This issue relates to the dark mode title bar color when MainMenuStrip is null. Investigate the rendering logic in the Form's title bar and MDI client area, possibly in files such as 'Form.cs' or 'MdiClient.cs' within the System.Windows.Forms source. Review the existing dark mode implementation and check how the title bar color is determined when MainMenuStrip is not set. Look at recent changes related to dark mode in the repository to identify the root cause.
[Dark Mode] The Form title bar is white color when the MDIParent1 MainMenuStrip property is set to none · dotnet/winforms#12991 | Good First Issue