Json.Net deserialize object give me empty object

Question

I am trying to de-serialize this json string:

{"PatientData":[
  {
    "device": {
      "serial": "M01106798",
      "manufacturer": "Nipro",
      "model": "TrueResult",
      "first_value_at": "2010-07-17T22:39:00",
      "last_value_at": "2010-09-30T11:18:00",
      "supports_glucose": "no",
      "supports_cgm": "no",
      "supports_insulin": "no",
      "supports_carb": "no"
    },
    "data": []
  },
  {
    "device": {
      "serial": "59-50889-10",
      "manufacturer": "Animas",
      "model": "IR1200",
      "first_value_at": "2014-02-07T11:46:00",
      "last_value_at": "2014-03-27T10:38:00",
      "supports_glucose": "no",
      "supports_cgm": "no",
      "supports_insulin": "no",
      "supports_carb": "no"
    },
    "data": [      
      {
        "type": "insulin_bolus",
        "created_at": "2014-02-07T23:42:00",
        "unit": "U",
        "total_value": 0.9,
        "spike_value": 0.9,
        "flags": [
          {
            "flag": 1008,
            "description": "Bolus inactive"
          }
        ]
      },
      {
        "type": "insulin_basal",
        "created_at": "2014-02-08T00:01:00",
        "value": 0.175,
        "unit": "U/h",
        "flags": []
      },
      {
        "type": "insulin_basal",
        "created_at": "2014-02-08T05:01:00",
        "value": 0.225,
        "unit": "U/h",
        "flags": []
      },
      {
        "type": "insulin_bolus",
        "created_at": "2014-02-08T07:42:00",
        "unit": "U",
        "total_value": 2.6,
        "duration": 1800,
        "flags": []
      },
      {
        "type": "insulin_bolus",
        "created_at": "2014-02-08T09:38:00",
        "unit": "U",
        "total_value": 0.3,
        "spike_value": 0.3,
        "flags": [
          {
            "flag": 1008,
            "description": "Bolus inactive"
          }
        ]
      },    
      {
        "type": "glucose",
        "created_at": "2014-03-27T12:55:18",
        "value": 33.167,
        "unit": "mmol/l",
        "flags": []
      }
    ]
  }
]}

by using classes generated from json2csharp like this

public class ObjPatientData
    {
        public class Device
        {
            public string serial { get; set; }
            public string manufacturer { get; set; }
            public string model { get; set; }
            public string first_value_at { get; set; }
            public string last_value_at { get; set; }
            public string supports_glucose { get; set; }
            public string supports_cgm { get; set; }
            public string supports_insulin { get; set; }
            public string supports_carb { get; set; }
        }

        public class PatientData
        {
            public Device device { get; set; }
            public List<object> data { get; set; }
        }

        public class RootObject
        {
            public List<PatientData> PatientData { get; set; }
        }

    }

and calling it like this:

LPatientData = new List<ObjPatientData.RootObject>();
LPatientData = JsonConvert.DeserializeObject<List<ObjPatientData.RootObject>>(Json);

but I get a list of empty objects; any help will be appreciated.

Thanks! please note that

you forget to add attributes to properties? like [JsonConverter(typeof(Int32))] — Mustafa Ekici
– Mustafa Ekici, Commented Apr 2, 2014 at 10:29
esskar you are right!! by changing LPatientData = new List<ObjPatientData.RootObject>(); LPatientData = JsonConvert.DeserializeObject<List<ObjPatientData.RootObject>>(Json); to LPatientData = new List<ObjPatientData.PatientData>(); LPatientData = JsonConvert.DeserializeObject<List<ObjPatientData.PatientData>>(Json); it works !! — brillox
– brillox, Commented Apr 2, 2014 at 10:33
Now please can someone instruct me on how to accept esskar answer and close this question? Thanks :-) — brillox
– brillox, Commented Apr 2, 2014 at 10:35

brillox · Accepted Answer · 2014-04-02 11:15:48Z

2

Based on the above classes, I solved the issue by returning a list of "PatientData" objects rather than a list of "RootObjects" and using a Jarray.Parse(Json) in this way:

ObjPatientData.RootObject Root = new ObjPatientData.RootObject();
var jArray = JArray.Parse(Json);
Root.PatientData = jArray.ToObject<List<ObjPatientData.PatientData>>();

answered Apr 2, 2014 at 11:15

brillox

3736 silver badges24 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Girish · Accepted Answer · 2018-02-02 07:25:25Z

I think following the code will work.

string json = "{\"PatientData\":[{\"device\": {\"serial\":    \"M01106798\",\"manufacturer\": \"Nipro\",\"model\": \"TrueResult\",\"first_value_at\": \"2010-07-17T22:39:00\",\"last_value_at\": \"2010-09-30T11:18:00\",\"supports_glucose\": \"no\",\"supports_cgm\": \"no\",\"supports_insulin\": \"no\",\"supports_carb\": \"no\"},\"data\": []},{\"device\": {\"serial\": \"59-50889-10\",\"manufacturer\": \"Animas\",\"model\": \"IR1200\",\"first_value_at\": \"2014-02-07T11:46:00\",\"last_value_at\": \"2014-03-27T10:38:00\",\"supports_glucose\": \"no\",\"supports_cgm\": \"no\",\"supports_insulin\": \"no\",\"supports_carb\": \"no\"},\"data\": [      {\"type\": \"insulin_bolus\",\"created_at\": \"2014-02-07T23:42:00\",\"unit\": \"U\",\"total_value\": 0.9,\"spike_value\": 0.9,\"flags\": [{\"flag\": 1008,\"description\": \"Bolus inactive\"}]},{\"type\": \"insulin_basal\",\"created_at\": \"2014-02-08T00:01:00\",\"value\": 0.175,\"unit\": \"U/h\",\"flags\": []},{\"type\": \"insulin_basal\",\"created_at\": \"2014-02-08T05:01:00\",\"value\": 0.225,\"unit\": \"U/h\",\"flags\": []},{\"type\": \"insulin_bolus\",\"created_at\": \"2014-02-08T07:42:00\",\"unit\": \"U\",\"total_value\": 2.6,\"duration\": 1800,\"flags\": []},{\"type\": \"insulin_bolus\",\"created_at\": \"2014-02-08T09:38:00\",\"unit\": \"U\",\"total_value\": 0.3,\"spike_value\": 0.3,\"flags\": [{\"flag\": 1008,\"description\": \"Bolus inactive\"}]},    {\"type\": \"glucose\",\"created_at\": \"2014-03-27T12:55:18\",\"value\": 33.167,\"unit\": \"mmol/l\",\"flags\": []}]}]}";


        JavaScriptSerializer javaScriptSerializer = new JavaScriptSerializer();

        RootObject rootObject = javaScriptSerializer.Deserialize<RootObject>(json);

I tried that before but I get an error of type of .. is not supported for deserialization of an array

Collectives™ on Stack Overflow

Json.Net deserialize object give me empty object

2 Answers 2

Comments

2 Comments

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

2 Comments

Related