异步方法

private async Task<List<Author>> GetAuthors()
{
  await Task.Delay(100).ConfigureAwait(false);
  return authors;
}

[HttpGet]
public async Task<ActionResult<IEnumerable<Author>>> Get()
{
  var data = await GetAuthors();
  if (data == null)
    return NotFound("No record");
  return data;
}