Intellisense suggesting code improvement not supported for the project's C# version

This issue has been moved from a ticket on Developer Community.

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[severity:It bothers me. A fix would be nice] I have this code:

public class MyClass { public int ResponseCode { get; set; } public IList<AnotherClass> ResponseArray { get; set; } public string ResponseString { get; set; } } MyClass instance = new MyClass(); VS Intellisense shows:

‘new’ expression can be simplified

and upon selecting that action, it changes new MyClass() to just new(), so that the line of code becomes: MyClass instance = new(); but then build fails with error code CS8181:

‘new’ cannot be used with tuple type. Use a tuple literal expression instead.

I think Intellisense has this bug where it’s recommending a code change that’s not supported for current C# version 6.0.

Microsoft Visual Studio Professional 2019 Version 16.11.7 .Net framework 4.6.1

[stackoverflow question] (https://stackoverflow.com/questions/70210593/visual-studio-intellisense-shows-new-expression-can-be-simplified-but-that-fa)

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Original Comments

Feedback Bot on 12/5/2021, 06:44 PM:

We have directed your feedback to the appropriate engineering team for further evaluation. The team will review the feedback and notify you about the next steps.

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Original Solutions

(no solutions)

[sharwell]

@Sergio0694 Starting with #36924, CSharpUseRangeOperatorDiagnosticAnalyzer and CSharpUseIndexOperatorDiagnosticAnalyzer are gated on the existence of System.Range and System.Index, respectively.

[sharwell]

The original issue above is a duplicate of #52727. It’s impossible for the code fix to be offered in a project targeting C# 6, which means the file was included in more than one project and triggered from a project targeting C# 9 or newer. This is exactly the scenario described by #52727.