lux/Lux.API/Controllers/ImageController.cs

using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using System.Diagnostics;

namespace Lux.API.Controllers
{
    [Route("api/[controller]")]
    [ApiController]
    public class ImageController : ControllerBase
    {
        public ImageController(ILogger<ImageController> logger)
        {
            _logger = logger;
        }
        /// <summary>
        /// Chiamata GET: riceve Json in formato JwdDto, restituisce svg file
        /// GET: api/Jwd/svg/00000000-0000-0000-0000-000000000000
        /// </summary>
        /// <param name="id">id univoco img</param>
        /// <returns></returns>
        [HttpGet("svg/{id}")]
        public async Task<IActionResult> svgFileGet(string id)
        {
            Stopwatch sw = new Stopwatch();
            sw.Start();
            string filePath = Path.Combine("DemoImg", "AntaDoppia.svg");
            var svgContent = await System.IO.File.ReadAllTextAsync(filePath);
            var bytes = System.Text.Encoding.UTF8.GetBytes(svgContent);
            sw.Stop();
            _logger.LogInformation($"svgString | {sw.Elapsed.TotalMilliseconds:N3} ms");
            return File(bytes, "image/svg+xml");
        }

        private readonly ILogger<ImageController> _logger;
    }
}