videoarchiveapi/VideoArchiveAPI/Controllers/VideoController.cs

using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Options;
using System.Diagnostics;

namespace VideoArchiveAPI.Controllers
{
    [ApiController]
    [Route("[controller]")]
    public class VideoController : ControllerBase
    {
        private readonly ILogger<VideoController> _logger;
        private readonly Config _config;

        public VideoController(ILogger<VideoController> logger, IOptions<Config> config)
        {
            _logger = logger;
            _config = config.Value;
        }

        [HttpGet(Name = "VideoController")]
        public ActionResult<List<string>> Get()
        {
            GetData getData = new GetData();

            List<string> directorys = getData.GetSubDirectories(_config.Location);
            if (directorys.Count == 0)
            {
                return NotFound();
            }
            else
            {
                return Ok(directorys);
            }
        }
    }

    public class GetData
    {
        public List<string> GetSubDirectories(string path)
        {
            List<string> directorys = new List<string>();
            string[] dirs = System.IO.Directory.GetDirectories(path);
            foreach (string dir in dirs)
            {
                string[] subDirs = System.IO.Directory.GetDirectories(dir);
                if(subDirs.Length == 0)
                {
                    directorys.Add(dir.Replace(path,"").Replace("\\", "").Replace("/",""));
                }
                else
                {
                    directorys.AddRange(GetSubDirectories(dir));
                }
            }
            return directorys;
        }
    }
}