Error reading jobject from jsonreader current jsonreader item is not an object startarray

I am working on a Windows Phone 8.1 application involving location. I am receiving Json data from my API. My API returns data that looks like:

[{
    "country": "India",
    "city": "Mall Road, Gurgaon",
    "area": "Haryana",
    "PLZ": "122002",
    "street": "",
    "house_no": "",
    "POI": "",
    "type": "17",
    "phone": "",
    "lng": 77.08972334861755,
    "lat": 28.47930118040612,
    "formatted_address": "Mall Road, Gurgaon 122002, Haryana, India"
},
{
    "country": "India",
    "city": "Mall Road, Kanpur",
    "area": "Uttar Pradesh",
    "PLZ": "208004",
    "street": "",
    "house_no": "",
    "POI": "",
    "type": "17",
    "phone": "",
    "lng": 80.35783410072327,
    "lat": 26.46026740300029,
    "formatted_address": "Mall Road, Kanpur 208004, Uttar Pradesh, India"
},
{
    "country": "India",
    "city": "Mall Road Area, Amritsar",
    "area": "Punjab",
    "PLZ": "143001",
    "street": "",
    "house_no": "",
    "POI": "",
    "type": "17",
    "phone": "",
    "lng": 74.87286686897278,
    "lat": 31.64115178002094,
    "formatted_address": "Mall Road Area, Amritsar 143001, Punjab, India"
},
{
    "country": "India",
    "city": "Vasant Kunj (Mall Road Kishan Garh), New Delhi",
    "area": "Delhi",
    "PLZ": "110070",
    "street": "",
    "house_no": "",
    "POI": "",
    "type": "18",
    "phone": "",
    "lng": 77.1434211730957,
    "lat": 28.51363217008815,
    "formatted_address": "Vasant Kunj (Mall Road Kishan Garh), New Delhi 110070, Delhi, India"
}]

I am deserializing my Json data and putting it into a class named LocationData. When I run my code, it gives me an error:

Error reading JObject from JsonReader. Current JsonReader item is not an object: StartArray. Path

Where am I going wrong? Here is my code:

private async void GetAPIData()
    {
        string _serviceUrl = "https://api.myweblinkapiprovider/v2&q=" + UserRequestedLocation;
        HttpClient client = new HttpClient();

        HttpResponseMessage responce = await client.GetAsync(new Uri(_serviceUrl));

        if (responce.Content != null)
        {
            var respArray = JObject.Parse(await responce.Content.ReadAsStringAsync());
            JsonSerializerSettings settings = new JsonSerializerSettings();
            settings.NullValueHandling = NullValueHandling.Ignore;
            settings.MissingMemberHandling = MissingMemberHandling.Ignore;
            var rcvdData = JsonConvert.DeserializeObject<LocationData>(respArray.ToString(), settings);
            UpdateMapData(rcvdData);
            UpdateTextData(rcvdData);
        }
    }

I also tried to use a JArray. My code is as below:

 private async void GetAPIData()
    {
        string _serviceUrl = "https://api.myweblinkprovider.com/v3?fun=geocode&lic_key=MyKey" + UserRequestedLocation;
        HttpClient client = new HttpClient();

        HttpResponseMessage responce = await client.GetAsync(new Uri(_serviceUrl));

        JArray arr = JArray.Parse(await responce.Content.ReadAsStringAsync());

        foreach (JObject obj in arr.Children<JObject>())
        {
            JsonSerializerSettings settings = new JsonSerializerSettings();
            settings.NullValueHandling = NullValueHandling.Ignore;
            settings.MissingMemberHandling = MissingMemberHandling.Ignore;
            var rcvdData = JsonConvert.DeserializeObject<LocationData>(arr.ToString(), settings);
            UpdateMapData(rcvdData);
            UpdateTextData(rcvdData);
        }
    }

It also gives me an error:

Cannot deserialize the current JSON array (e.g. [1,2,3]) into type 'MMI_SpeechRecog.Model.LocationData' because the type requires a JSON object (e.g. {"name":"value"}) to deserialize correctly.

First I made an application and then I’ve started doing test for it ( Know it is not good way ), everything works fine with parsing etc, but after i made few test got an error :

Newtonsoft.Json.JsonReaderException : Error reading JObject from JsonReader. Current JsonReader item is not an object: StartArray. Path », line 1, position 1.

Error occurs there jObject = JObject.Parse(content); and there arrayList = JArray.Parse(content);

internal JObject DoParse(string content)
{
    JObject jObject = new JObject();
    if (content != null)
    {
        if (content.Contains("Unable"))
        {
            MessageBox.Show("Not found.", "Error");
        }
        else
        {
            jObject = JObject.Parse(content);
        }
    }
    return jObject;
}

internal JArray DoParseOnList(string content)
{
    JArray arrayList = new JArray();
    if (content != null)
    {
        if (content.Contains("Unable"))
        {
            MessageBox.Show("Not found.", "Error");
        }
        else
        {

            arrayList = JArray.Parse(content);
        }
    }
    else { }
    return arrayList;
}

Any ideas what is wrong ?
Btw. string content is json which i got from the server.
Thanks in advance !

JSON

Test Name:  SetGroup
Test Outcome:   Failed
Result Message: SetUp : Newtonsoft.Json.JsonReaderException : Error reading JObject from JsonReader. Current JsonReader item is not an object: StartArray. Path '', line 1, position 1.
Result StandardOutput:  [{"id":6208,"name":"test"},{"id":6315,"name":"jPOD v144 Testing"},{"id":6306,"name":"iButton Issue"},{"id":6424,"name":"Hybrid"}]
[{"id":6208,"name":"test"},{"id":6315,"name":"jPOD v144 Testing"},{"id":6306,"name":"iButton Issue"},{"id":6424,"name":"Hybrid"}]
[{"enabled":true,"scriptVersion":199,"configVersion":3,"name":"LMU3030 Hybrid Car Test based on 64.112 add ignition on-off"},{"enabled":true,"scriptVersion":199,"configVersion":2,"name":"LMU3030 Hybrid Car Test based on 50.106"},{"enabled":true,"scriptVersion":199,"configVersion":1,"name":"Hybrid car LMU 3030 Ignition test","description":""},{"enabled":true,"scriptVersion":64,"configVersion":113,"name":"based on 64.112 Engineering Build from calamp"},{"enabled":true,"scriptVersion":61,"configVersion":106},{"enabled":true,"scriptVersion":38,"configVersion":117},{"enabled":true,"scriptVersion":184,"configVersion":0},{"enabled":true,"scriptVersion":13,"configVersion":54},{"enabled":true,"scriptVersion":23,"configVersion":105,"name":"PULS Redirect to PROD","description":"Changes just Param 2320 to maint.vehicle-location.com"}]
[]
[{"message":"Not Implemented","vbusDeviceFiles":[],"vbusFileHistories":[]}]

Posted By: Anonymous

I am working on a Windows Phone 8.1 application involving location. I am receiving Json data from my API. My API returns data that looks like:

[{
    "country": "India",
    "city": "Mall Road, Gurgaon",
    "area": "Haryana",
    "PLZ": "122002",
    "street": "",
    "house_no": "",
    "POI": "",
    "type": "17",
    "phone": "",
    "lng": 77.08972334861755,
    "lat": 28.47930118040612,
    "formatted_address": "Mall Road, Gurgaon 122002, Haryana, India"
},
{
    "country": "India",
    "city": "Mall Road, Kanpur",
    "area": "Uttar Pradesh",
    "PLZ": "208004",
    "street": "",
    "house_no": "",
    "POI": "",
    "type": "17",
    "phone": "",
    "lng": 80.35783410072327,
    "lat": 26.46026740300029,
    "formatted_address": "Mall Road, Kanpur 208004, Uttar Pradesh, India"
},
{
    "country": "India",
    "city": "Mall Road Area, Amritsar",
    "area": "Punjab",
    "PLZ": "143001",
    "street": "",
    "house_no": "",
    "POI": "",
    "type": "17",
    "phone": "",
    "lng": 74.87286686897278,
    "lat": 31.64115178002094,
    "formatted_address": "Mall Road Area, Amritsar 143001, Punjab, India"
},
{
    "country": "India",
    "city": "Vasant Kunj (Mall Road Kishan Garh), New Delhi",
    "area": "Delhi",
    "PLZ": "110070",
    "street": "",
    "house_no": "",
    "POI": "",
    "type": "18",
    "phone": "",
    "lng": 77.1434211730957,
    "lat": 28.51363217008815,
    "formatted_address": "Vasant Kunj (Mall Road Kishan Garh), New Delhi 110070, Delhi, India"
}]

I am deserializing my Json data and putting it into a class named LocationData. When I run my code, it gives me an error:

Error reading JObject from JsonReader. Current JsonReader item is not an object: StartArray. Path

Where am I going wrong? Here is my code:

private async void GetAPIData()
    {
        string _serviceUrl = "https://api.myweblinkapiprovider/v2&q=" + UserRequestedLocation;
        HttpClient client = new HttpClient();

        HttpResponseMessage responce = await client.GetAsync(new Uri(_serviceUrl));

        if (responce.Content != null)
        {
            var respArray = JObject.Parse(await responce.Content.ReadAsStringAsync());
            JsonSerializerSettings settings = new JsonSerializerSettings();
            settings.NullValueHandling = NullValueHandling.Ignore;
            settings.MissingMemberHandling = MissingMemberHandling.Ignore;
            var rcvdData = JsonConvert.DeserializeObject<LocationData>(respArray.ToString(), settings);
            UpdateMapData(rcvdData);
            UpdateTextData(rcvdData);
        }
    }

I also tried to use a JArray. My code is as below:

 private async void GetAPIData()
    {
        string _serviceUrl = "https://api.myweblinkprovider.com/v3?fun=geocode&lic_key=MyKey" + UserRequestedLocation;
        HttpClient client = new HttpClient();

        HttpResponseMessage responce = await client.GetAsync(new Uri(_serviceUrl));

        JArray arr = JArray.Parse(await responce.Content.ReadAsStringAsync());

        foreach (JObject obj in arr.Children<JObject>())
        {
            JsonSerializerSettings settings = new JsonSerializerSettings();
            settings.NullValueHandling = NullValueHandling.Ignore;
            settings.MissingMemberHandling = MissingMemberHandling.Ignore;
            var rcvdData = JsonConvert.DeserializeObject<LocationData>(arr.ToString(), settings);
            UpdateMapData(rcvdData);
            UpdateTextData(rcvdData);
        }
    }

It also gives me an error:

Cannot deserialize the current JSON array (e.g. [1,2,3]) into type 'MMI_SpeechRecog.Model.LocationData' because the type requires a JSON object (e.g. {"name":"value"}) to deserialize correctly.

Solution

The first part of your question is a duplicate of Why do I get a JsonReaderException with this code?, but the most relevant part from that (my) answer is this:

[A] JObject isn’t the elementary base type of everything in JSON.net, but JToken is. So even though you could say,

object i = new int[0];

in C#, you can’t say,

JObject i = JObject.Parse("[0, 0, 0]");

in JSON.net.

What you want is JArray.Parse, which will accept the array you’re passing it (denoted by the opening [ in your API response). This is what the «StartArray» in the error message is telling you.

As for what happened when you used JArray, you’re using arr instead of obj:

var rcvdData = JsonConvert.DeserializeObject<LocationData>(arr /* <-- Here */.ToString(), settings);

Swap that, and I believe it should work.

Although I’d be tempted to deserialize arr directly as an IEnumerable<LocationData>, which would save some code and effort of looping through the array. If you aren’t going to use the parsed version separately, it’s best to avoid it.

Answered By: Anonymous

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Edit time: 2017-05-10. Add a method to transform list
First, I know a way to parse JSON string before, I find it a little troublesome. I got another one from somewhere else

string json = vlt.getlist();

JObject jo = JObject.Parse(json);

var data = jo.getValue("data").ToObject<T>();

T is the corresponding entity class, and can be used directly in the member variable data.member
2. Json transformation of the List is to put it into redIS cache, and then take it out for transformation
Don’t talk nonsense, code on:

            var t = new List<PcWareListByCourseId>();
            var m1 = new PcWareListByCourseId
            {
                videoId = 12,
                IsAuditions = false,
                percent = 23,
                practiceId = 43,
                statuss = 2,
                TotalTime = "12.2",
                wareId = 22,
                wareName = "courseware"
            };
            var m2 = new PcWareListByCourseId
            {
                videoId = 12,
                IsAuditions = false,
                percent = 23,
                practiceId = 43,
                statuss = 2,
                TotalTime = "12.2",
                wareId = 22,
                wareName = "courseware"
            };
            t.Add(m1);
            t.Add(m2);
            RedisInfoHelper.SetRedis("test",t);

            var get = RedisInfoHelper.GetRedisValue("test");

            var jo = JArray.Parse(get);
            var jj = jo.ToObject<List<PcWareListByCourseId>>();

Entity code:

    public class PcWareListByCourseId
    {
        public int wareId { set; get; }
        public string wareName { set; get; }
        public bool IsAuditions { set; get; }
        public int videoId { set; get; }
        public int percent { set; get; }
        public int practiceId { set; get; }
        public int statuss { set; get; }
        public string TotalTime { set; get; }//11'22"
    }

Successful to the last step, successful transformation.
This time I’m using the JArray method class.

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