Failed to Clipboard.GetData() as the specified format

[Philip-Wang01]

.NET version

.NET 8.0.100-preview.5.23274.2

Did it work in .NET Framework?

Yes

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

Yes, it works in .NET 6.0/7.0/8.0.100-preview5.23253.20. Maybe caused by: #9088

Issue description

Testapp: Testapp.zip

.NET 8.0

.NET 7.0

Steps to reproduce

1. Create a WinForms .NET Core project.
2. Add a button control to form designer, double click button1 and type below code in function button1_Click.

Color c = System.Drawing.Color.Black;
string format = "testabc";
Clipboard.Clear();
Clipboard.SetData(format, c);
Clipboard.ContainsData(format);
object ob = null;
ob = Clipboard.GetData(format);

3. Add a breakpoint at the end of the event, build and run the application, click button1.
4. Observe the value of ob.

[elachlan]

@JeremyKuhne I guess you are still working through the binary formatter changes?

#6267

[JeremyKuhne]

This doesn't reproduce for me with the current bits when the BinaryFormatter is enabled, which it should be. When it is disabled, it returns null. @Philip-Wang01 can you debug with first chance exceptions to see if you're getting a NotSupportedException with the binary formatter?

Some notes on the BinaryFormatter being disabled:

Unfortunately, the OLE clipboard window always swallows errors when setting data (in WM_RENDERFORMAT it always returns an LRESULT of 0). So setting always succeeds. If we try to get the data out it will fail with CLIPBRD_E_BAD_DATA, which we swallow. I've added some debug assistance around that in the #9195 PR.

I'm thinking through what we might be able to do to surface that the BinaryFormatter has been disabled and will likely create an issue to track soon.

[Philip-Wang01]

@JeremyKuhne I have built debug and release dlls under winforms repro. Get NotSupportedException with the binary formatter when using debug dlls and don't get NotSupportedException when using release dlls.
I also found that when I get NotSupportedException, clicking on the “Copy Details” gives an error message, could you help to see this phenomenon?

bandicam.2023-05-30.23-45-35-515.mp4

[Philip-Wang01]

Verified this test steps in the latest .Net 8.0 SDK build: 8.0.100-preview.6.23307.24, it was fixed. However, this issue still affects automated test cases and will be updated after investigation.

Automation test cases:

[Philip-Wang01]

After investigation, the test cases failed for similar reasons as 9322.
This test case is a "console application", not a "winforms application". It can be fixed when <EnableUnsafeBinaryFormatterSerialization>true</EnableUnsafeBinaryFormatterSerialization> is added in the project file.
But the status of this issue is still work in progress, @JeremyKuhne do we still need to keep the issue open?

[JeremyKuhne]

@Philip-Wang01 we don't need it open, I'm going to close it. Thanks for the heads up.