[Swashbuckle.AspNetCore] Display only ApiController controllers in the swagger

ApiExplorerGetsOnlyConvention.cs

using System.Linq;
using Microsoft.AspNetCore.Mvc.ApplicationModels;

namespace MyProgram
{
    public class ApiExplorerGetsOnlyConvention : IActionModelConvention
    {
        public void Apply(ActionModel action)
        {
            action.ApiExplorer.IsVisible = action.Controller.Attributes.Any(x => x.GetType() == typeof(Microsoft.AspNetCore.Mvc.ApiControllerAttribute));
        }
    }

}

Startup.cs

public void ConfigureServices(IServiceCollection services)
{
    services.AddMvc(options => options.Conventions.Add(new ApiExplorerGetsOnlyConvention()));
}