Support the required keyword in the same way as RequiredAttribute

[AntiGuideAkquinet]

When using .NETs required keyword, the properties that it is used on do not get marked as required in SwaggerGen. I set up a project to reproduce the issue. When adding the RequiredAttribute to the property, the result changes to the expected behavior.

I assume that this line could fix the problem if it checked for RequiredMemberAttribute too.

Thank you for investigating!

Version: 6.5.0
C# 11/.NET 7 and up
SwashbuckleReproduction.zip

[KRSogaard]

+1 this is causing a lot of problem in API communication with frontend team members

[Havunen]

This functionality has been implemented in DotSwashbuckle v3.0.1
Havunen@2871109
https://www.nuget.org/packages/DotSwashbuckle.AspNetCore

[mattiasnordqvist]

Why did you do this? Required-keyword in C# has nothing to do with nullability. It is there to enforce initialization of properties in constructor or constructor-initializers. It is perfectly fine in C# to declare a property as a required nullable int like this: required int? { get; set; }

[martincostello]

See #2879.