My API is not displaying all the versions.

[GProGamer]

My API is not displaying all the versions.

[commonsensesoftware]

On the line:

https://github.com/GProGamer/HotelListing/blob/master/HotelListing.API/Program.cs#L52

you need to add .AddMvc(). Starting in API Versioning 6.0, this call is now required to bring in MVC Core. Without this call, only Minimal APIs are considered. The fact that anything works at all is a coincidence. I suspect after you add that, things will work as expected.

Note: this calls IApiVersioningBuilder.AddMvc and not IServiceCollectionBuilder.AddMvc, which does something different

[GProGamer]

I've forgot to say that I've already try to add .AddMvc(). I've tried again but I'm still getting the same weird behaviour:
it just shows version 1

but not version 2:

Help me please

[commonsensesoftware]

I browsed over the repro a little too fast. There's actually a number of things missing from your configuration that should be there. This information is provided in the wiki and example projects with OpenAPI and Swashbuckle. Ultimately, you need to use the API Explorer extensions provided by API Versioning to drive the generation of OpenAPI documents with Swashbuckle. There is no formal concept of versioning in the API Explorer, so Swashbuckle does not know how to use the information without a little help.

Since you provided a repro, you can apply the following Git patch and you should be only your way.

fix-config.patch