Question

I am trying to serialse a fingerprint FMD to XML using the code below, but get an error:

Error: DPUruNet.DataResult`1[DPUruNet.Fmd] cannot be serialized
because it does not have a parameterless constructor.

  public void storePrint(DataResult<Fmd> resultConversion)
        {
                //store fingerprint as byte and insert to server------------
                 using (StreamWriter myWriter = new StreamWriter("test.txt", false))
                {

                    System.Xml.Serialization.XmlSerializer x = new System.Xml.Serialization.XmlSerializer(resultConversion.GetType());
                    x.Serialize(myWriter, resultConversion);
                }
                MessageBox.Show("Fingerprint Stored!");

                //------------------------------------------------------------
        }
        private void OnCaptured(CaptureResult captureResult)
        {
            try
            {
                // Check capture quality and throw an error if bad.
                if (!_sender.CheckCaptureResult(captureResult)) return;

                count++;

                DataResult<Fmd> resultConversion = FeatureExtraction.CreateFmdFromFid(captureResult.Data, Constants.Formats.Fmd.ANSI);

                SendMessage(Action.SendMessage, "A finger was captured.  \r\nCount:  " + (count));

                if (resultConversion.ResultCode != Constants.ResultCode.DP_SUCCESS)
                {
                    _sender.Reset = true;
                    throw new Exception(resultConversion.ResultCode.ToString());
                }

                preenrollmentFmds.Add(resultConversion.Data);
                //--------------------CALL METHOD
                storePrint(resultConversion);
                //

The class DataResult is being referenced, so I can not alter it

Answer 1

Thanks to Cory, that is a useful answer, however in this example there is another way of serializing using

tempFingerPrint = Fmd.SerializeXml(resultConversion.Data);

this is specific to the Digital Persona SDK