controller.cs

using System.IO;
using System.Reflection;
using System.Text;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;

namespace EmbeddedResource.Controllers
{
    [Route("api/[controller]")]
    public class ValuesController : Controller
    {
        // GET api/values
        [HttpGet, Produces("application/json")]
        public async Task<string> Get()
        {
            var assembly = Assembly.GetEntryAssembly();
            var resourceStream = assembly.GetManifestResourceStream("EmbeddedResource.Data.fakedata.json");
            using (var reader = new StreamReader(resourceStream, Encoding.UTF8))
            {
                return await reader.ReadToEndAsync();
            }
        }
    }
}