[Bug]: Using latest version of Swashbuckle, OpenAPI documentation is incorrect when using custom TryParse() binding with Minimal APIs

[marcominerva]

Describe the bug

Using latest versions of Swashbuckle (from 6.7.0 to the last one) with .NET 8.0.10, I have the same issue described in dotnet/aspnetcore#36412. If I revert to Swashbuckle.AspNetCore 6.6.2, everything works as expected.

Steps to reproduce

Use Swashbuckle.AspNetCore 6.7.0 or later and try the code at dotnet/aspnetcore#36412.

Swashbuckle.AspNetCore version

6.7.0 or later

.NET Version

8.0.403

Anything else?

No response

[martincostello]

I wonder if we need to do something similar to how they fixed it: dotnet/aspnetcore#36526

[marcominerva]

@martincostello if you can give me an hint about what part of Swashbuckle to look at, I could try to give it a look. In this moment, this is a blocking issue for me, so I would be happy to contribute.

[martincostello]

To be honest, I don't know myself off the top of my head without going digging in the code. I would imagine whatever it is in is here somewhere: https://github.com/domaindrivendev/Swashbuckle.AspNetCore/tree/master/src/Swashbuckle.AspNetCore.SwaggerGen/SchemaGenerator

[marcominerva]

By the way, the same problem happens also using the new built-in generator provided by .NET 9.0 RC2. I have opened an issue on the ASP.NET Core repository: dotnet/aspnetcore#58318.

[jgarciadelanoceda]

The issue may probably be caused by #2980, however it has to be rethinked because this was also preventing the base types like int,Enums,DateTimes to be reported as the actual type ( Not just a string)
https://github.com/domaindrivendev/Swashbuckle.AspNetCore/blob/master/src%2FSwashbuckle.AspNetCore.SwaggerGen%2FSwaggerGenerator%2FSwaggerGenerator.cs#L593-L601

The Enums at least is where I found that it wasn't generating an enum

[marcominerva]

@jgarciadelanoceda, can you explain the issue are you referring to about base types?

I have tried with:

app.MapGet("/test", (int number, DateTime dateTime, Status status) => TypedResults.NoContent());

public enum Status
{
    Active,
    Disabled
}

And I obtain this result (that seems correct):

[jgarciadelanoceda]

With the version 6.6.2 the enum was not being shown as Enum and just as string, I am reviewing it

[jgarciadelanoceda]

I have created a PR.. I showed that the #2532 fixed the issue #2733 and I applied with the latest bits.
Sorry for it and thanks for this issue