[Discussion]: Evaluate .NET 9 Release Candidates and General Availability Release Breaking Changes

[giduac]

Evaluate breaking changes for DN9: https://learn.microsoft.com/en-us/dotnet/core/compatibility/9.0

Investigate the remediation of warning WFO1000

The .NET error WFO1000 was introduced in .NET 9 RC-1 and occurs primarily in WinForms applications. It signifies that a property within a component is not properly configured for serialization. This issue arises when properties lack appropriate serialization attributes, causing the application to throw the error during compilation.

• The above points to the fact that each affected property needs to be inspected and that the solution below does not fit each occurrence of WFO1000.
• So some properties might be made hidden other need to receive proper serialization and reset routines and DefaultValues to remove the error.
• WFO1000 seems to be undocumented.
• Currently the info on the web is very limited.
• Possible solution https://www.c-sharpcorner.com/article/property-x-does-not-configure-the-code-serialization-for-its-property-content/
• Can a single change for all affected properties be applied or are multiple scenarios possible?

Winforms: BindingSource.SortDescriptions doesn't return null

• https://learn.microsoft.com/en-us/dotnet/core/compatibility/windows-forms/9.0/sortdescriptions-return-value
• No occurrences found in the source.

Changes to nullability annotations (Windows Forms)

• https://learn.microsoft.com/en-us/dotnet/core/compatibility/windows-forms/9.0/nullability-changes
• Two occurrence found and both pass a valid reference.

ComponentDesigner.Initialize throws ArgumentNullException https://learn.microsoft.com/en-us/dotnet/api/system.componentmodel.design.componentdesigner.initialize?view=windowsdesktop-8.0

• Multiple occurrences found in Standard and some in Extended do a search in files using Notepad++ with search term (".Initialize(").
• Needs further evaluation to see what needs to be done , if any.

DataGridViewRowAccessibleObject.Name starting row index

• https://learn.microsoft.com/en-us/dotnet/core/compatibility/windows-forms/9.0/datagridviewrowaccessibleobject-name-row
• No occurrences found in the source.

IMsoComponent support is opt-in

• https://learn.microsoft.com/en-us/dotnet/core/compatibility/windows-forms/9.0/imsocomponent-support
• Not sure if any of this is applicable to the Toolkit or even would pose a problem.

No exception if DataGridView is null

• https://learn.microsoft.com/en-us/dotnet/core/compatibility/windows-forms/9.0/datagridviewheadercell-nre
• No occurrences of the mentioned methods in the article found in the source.

PictureBox raises HttpClient exceptions

• https://learn.microsoft.com/en-us/dotnet/core/compatibility/windows-forms/9.0/httpclient-exceptions
• Not sure if loading remote images using a PictureBox component is used within the Toolkit?

[giduac]

@Smurf-IV, @PWagner1 & @Ahmed-Abdelhameed,

I'm getting reluctant to go full throttle on .NET 9 RC1 at this point. https://github.com/dotnet/sdk/issues/43339

I think we should evaluate the breaking changes and see what needs to be done on the toolkit and can prepare what is possible ahead of RC2.

From there we wait until RC2 is released to see if that proves stable.

[Smurf-IV]

From there we wait until RC2 is released to see if that proves stable.

Agreed.

[giduac]

Hi @PWagner1, @Smurf-IV & @Ahmed-Abdelhameed,

I've updated the topic start with my findings so far.

Can you all please evaluate the Breaking changes for yourselves and see what needs to be done?