BinaryFormatter error when clicking "Add Tab" command for TabControl in DemoConsole application

[Philip-Wang01]

.NET version

.NET 9.0: Main branch of WinForms repo (.NET 9.0.0-preview.7.24326.3)

Did it work in .NET Framework?

Yes

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

Yes, this is a regression issue. Not repro on .NET 9.0.0-preview.6.24305.2

Issue description

In DemoConsole test app of Winforms repo, BinaryFormatter error when clicking "Add Tab" command for TabControl.

testaddtab.mp4

Steps to reproduce

Test sample: DemoConsole in Winforms repo

More Info:

This issue also reproduces on ImageList when clicking the "Add" command.

[elachlan]

Related to #9428 and #6267

We had similar issues when BinaryFormatter was marked as obsolete #9416

[LeafShi1]

This issue appears after PR #11540

[LeafShi1]

This issue disappear after add binary Formatter package (Related PR #11741)

[John-Qiao]

Verified the issue on the latest DemoConsole test app of Winforms repo from main branch, it was fixed: no exception occurs when clicking "Add Tab" command for TabControl now.

11607-testresult2.mp4