Derived form is write protected

[r-schaefer]

Environment

Visual Studio 2022 - Community Edition, Version 17.5.2

.NET version

.Net 7.0

Did this work in a previous version of Visual Studio and/or previous .NET release?

Yes: With Visual Studio 2019 and .Net Framework 4.6.2

Issue description

A derived form cannot be edited with VS 2022:

See attached project:

• BaseForm.cs: is the base form class
• BaseMDIChild.cs: inherits from BaseForm.cs
• BaseMDIERPDataChild.cs: inherits from BaseMDIChild.cs

This form seems to be write protected. You cannot insert any control.

Steps to reproduce

1. Open the project, compile it
2. Open the form BaseMDIERPDataChild.cs and try inserting a control

Diagnostics

No response

[r-schaefer]

DXApplication58.zip

[merriemcgaw]

@Olina-Zhang can your team please try to repro this?

[Olina-Zhang]

@Olina-Zhang can your team please try to repro this?

Yes, we can repro it, it was caused by Base Form's WindowsState with Maximized value set, repro with out of process designer in Visual Studio 16.11.25 to the latest, not in-process designer. Cannot drag and drop controls to form designer, and can copy&paste or double-click controls.

[r-schaefer]

Many thanks for your quick support. Resetting the WindowState to Normal fixed the issues:

• The form is no longer write protected
• All controls are shown within the designer

[elachlan]

Is there a corresponding designer issue created?

[Olina-Zhang]

WindowsState with Maximized

It is the designer issue: https://github.com/microsoft/winforms-designer/issues/5057.