Clipboard behaves different between net8 and net9

[InlineAsm]

.NET version

net9.0-windows

Did it work in .NET Framework?

Yes

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

It does work on net8.0

Issue description

The Clipboard method ContainsText returns false when a string is placed on the clipboard using SetDataObject. In previous versions of the runtime this method would return true.

Steps to reproduce

The following code returns true on net8.0 and returns false on net9.0

Clipboard.SetDataObject("TEXT");
var containsText = Clipboard.ContainsText();

[lonitra]

@LeafShi1 could your team take an initial look? My initial thought is perhaps we had accidentally changed something in Clipboard.ContainsText between .NET 8/9 - perhaps some sort of typo.

The codepath for Clipboard.ContainsText should eventually call IDataObject.GetDataPresent, which should go to our DataStore.GetDataPresent. where it should check to see if the format is there - though it is possible on .NET 8 that this goes to a different implementation we have of IDataObject.GetDataPresent. We should compare what the difference is between the codepath for .NET 8/9

[Epica3055]

@lonitra
I think this issue might be caused by pr_10651

Before the pr

issues_12665_01.mp4

After the pr

issues_12665_02.mp4

[ricardobossan]

I proceeded to do binary search on the issue and arrived at the same conclusion as @Epica3055 : The faulty commit is 64528f3e176738f7e621ed6959c4593b24db9453 (Convert Rest of Ole to Cswin32 (#10651))

[lonitra]

Calling Clipboard.GetDataObject().GetDataPresent(DataFormats.UnicodeText, autoConvert: true) instead of Clipboard.ContainsText() should work as a workaround while further investigation is done.

[Tanya-Solyanik]

@ricardobossan - please add a unit test for this issue and create a PR with this test disabled, we'll enable when the fix is ready.

[ricardobossan]

@ricardobossan - please add a unit test for this issue and create a PR with this test disabled, we'll enable when the fix is ready.

@Tanya-Solyanik This is already been addressed by @lonitra on #12738 , class ClipboardTests.cs.

[lonitra]

Fix will be available in 9.0.2 release