Swagger response description not shown

Question

I am currently attempting to display a description of a particular response in Swagger UI, but there doesn't seem to be a documentation that truly covers all aspects of that, and all the examples I've tried from Get started with Swashbuckle and ASP.NET Core don't work in .NET Core 3.1...

        /// <summary>
        /// Test route...
        /// </summary>
        /// <returns></returns>
        /// <response code="200">This is a test</response>
        [HttpGet]
        [ProducesResponseType(typeof(string), StatusCodes.Status200OK)]
        public IActionResult Get()
        {
            return Ok("Hello World");
        }

My .csproj contains the following as well:

  <PropertyGroup>
    <GenerateDocumentationFile>true</GenerateDocumentationFile>
    <NoWarn>$(NoWarn);1591</NoWarn>
  </PropertyGroup>

The Swagger UI ends up looking like this (and as you can see, the "Descriptipn" column doesn't contain the "This is a test" text as it probably should). Am I missing something?

I also had added [SwaggerResponse(StatusCodes.Status200OK, ...)] to it, but nothing changes.

Answer 1

As it turns out, [SwaggerResponse] works properly, but before, I need to "enable annotations" in my Startup...

    services.AddSwaggerGen(config =>
    {
        config.SwaggerDoc("v1", new OpenApiInfo
        {
            Title = "Some API",
            Version = "v1"
        });

        config.EnableAnnotations();
    });