.net core 在服务端限制文件下载速度（传输速度）

  public IActionResult GetFile() {
            MyFileStream readStream = new MyFileStream(@"XXX/A.XX", FileMode.Open);
            return new FileStreamResult(readStream, "application/octet-stream");
        } 

 public class MyFileStream : FileStream
    {
        /// <summary>
        /// 速度 KB
        /// </summary>
        private int speek = 512;
        public MyFileStream(string path, FileMode mode) : base(path, mode)
        {
            speek = 256;
        }
        public override int Read(byte[] array, int offset, int count) {
            //count = 32;
            Thread.Sleep((int)(100/(speek/512d)));
            return base.Read(array,offset,count);
        }
    }