public string GetExtraInfo(string json) { ResultInfo resultInfo = new ResultInfo(); try { Request request = JsonConvert.DeserializeObject <Request>(json); string FilePath = request.filepath; byte[] bytes = citHelper.GetExtraInfo(FilePath); string base64 = Convert.ToBase64String(bytes); resultInfo.flag = 1; resultInfo.msg = ""; resultInfo.data = base64; } catch (Exception ex) { resultInfo.flag = 0; resultInfo.msg = ex.Message; } return(JsonConvert.SerializeObject(resultInfo)); }