WebApi NET Core not receiving request json, whereas it does in NET standard

Question

I created a NET Core starter WebApi project and added a very simple method/object. Testing the endpoint with Fiddler the request body doesnt bind to the post param. I had spent 2 hours of searching for a solution to no avail. For brevity I included my object in the controller.

namespace CoreWebApi.Controllers
{
    using Microsoft.AspNetCore.Mvc;

    [Route("[controller]")]
    [ApiController]
    public class ValuesController : ControllerBase
    {
        [HttpPost]
        public Message Post([FromBody]Message message)
        {
            return message;
        }
    }

    public class Message
    {
        public string Application;

        public string StatusOverride;
    }
}

After a lot of head scratching, I created a NET Standard web api starter project, copy/paste of my method and object and worked first time! Wondering if someone can enlighten me as to what I would need to do on my NET core webapi to get it working.

using System.Web.Http;

namespace WebApplication9.Controllers
{
    public class ValuesController : ApiController
    {
        public Message Post([FromBody]Message message)
        {
            return message;
        }
    }

    public class Message
    {
        public string Application;

        public string StatusOverride;
    }
}

Answer 1

Even though class members are public, they still need to have get/set accessors:

public class Message
{
    public string Application { get; set; }
    public string StatusOverride { get; set; }
}

...and it works!