private string FormatMessage(MessageResponse response) { var message = response.ToXml().Replace("\0", string.Empty); if (_messageConfig.MessageEncryptModel == EncryptModel.Encrypt) { var encryptResponse = new EncryptMessageResponse { Nonce = Helper.GetNonceStr(), TimeStamp = Helper.GetTimestamp().ToString(CultureInfo.InvariantCulture), Value = MessageCryptography.AesEncrypt(message, _messageConfig.EncodingAesKey, _messageConfig.AppId) }; string sign = Check.GetWeChatMessageSign(_messageConfig.EncodingAesKey, encryptResponse.Nonce, encryptResponse.TimeStamp, message); encryptResponse.Sign = sign; return(XmlSerializeHelper.ObjectToXmlString(encryptResponse).Replace("\0", string.Empty)); } return(message); }