.net core 文件下载

using Microsoft.AspNetCore.Mvc;

namespace upload.Controllers
{
    [Route("api/[controller]")]
    [ApiController]
    public class DownloadController : ControllerBase
    {
        [HttpGet(Name = "download")]
        public object Get()
        {

            string filePath = "D:\\work\\file\\多线程.rar";
            var fileStream = new FileStream(filePath, FileMode.Open, FileAccess.ReadWrite);

            return File(fileStream, "application/octet-stream", "多线程.rar");
        }
    }
}