tcc/ASP.NET/Controllers/ImageController.cs

using Microsoft.AspNetCore.Mvc;
using TCC.Services;

namespace TCC.Controllers
{
    [ApiController]
    [Route("image")]
    public class ImageController : ControllerBase
    {
        private ImageService ImageService {  get; set; }
        public byte[] ImageData { get; set; }

        public ImageController(ImageService imageService)
        {
            this.ImageService = imageService;
        }

        [HttpPost("save-big-image")]
        public async Task<IActionResult> SaveBigImage()
        {
            MemoryStream mstream = new MemoryStream();
            await HttpContext.Request.Body.CopyToAsync(mstream);
            mstream.Position = 0;

            ImageService.SaveImage(mstream);
            mstream.Close();

            return Ok();
        }
    }
}