public async Task GetVerifyCode() { Response.ContentType = "image/jpeg"; using (var stream = VerifyCodeHelper.Create(out string code)) { var buffer = stream.ToArray(); // 将验证码的token放入cookie Response.Cookies.Append(VERFIY_CODE_TOKEN_COOKIE_NAME, await SecurityServices.GetVerifyCodeToken(code)); await Response.Body.WriteAsync(buffer, 0, buffer.Length); } }