deserializing JSON object .net

Question

I have problem with deserialize json object. I read many threads on stackoverflow but I didn't find solution. I use .net 2.0 and Newtonsoft library.

Below is json string:

{
    "data": {
        "custom_fields": [{
            "field": "segmentid",
            "value": "B"
        },
        {
            "field": "subsegmentid",
            "value": "TM3"
        },
        {
            "field": "contactpersonid",
            "value": "000187_003"
        },
        {
            "field": "firstname",
            "value": "ZBIGNIEW"
        },
        {
            "field": "agreetment",
            "value": "1"
        },
        {
            "field": "contactname",
            "value": "ZBIGNIEW TESTOWY"
        },
        {
            "field": "decisionmaking",
            "value": "0"
        },
        {
            "field": "lastpurchase",
            "value": ""
        },
        {
            "field": "agethresholds",
            "value": "0"
        },
        {
            "field": "tendercust",
            "value": ""
        }],
        "email": "[email protected]",
        "state": "1"
    },
    "status": "OK"
}

I developed two classes but I still get below error.

Cannot deserialize the current JSON object (e.g. {\"name\":\"value\"}) into type 'System.Collections.Generic.List`1[FMIntegration.DataFM]' because the type requires a JSON array (e.g. [1,2,3]) to deserialize correctly.\r\nTo fix this error either change the JSON to a JSON array (e.g. [1,2,3]) or change the deserialized type so that it is a normal .NET type (e.g. not a primitive type like integer, not a collection type like an array or List) that can be deserialized from a JSON object. JsonObjectAttribute can also be added to the type to force it to deserialize from a JSON object.\r\nPath 'data.email'

var SubscriberGet = JsonConvert.DeserializeObject<SubscriberGet>(json); 

public class SubscriberGet
{
    [JsonProperty("status")]
    public string Status { get; set; }

    [JsonProperty("data")]
    public List<DataFM> Data { get; set; }
}

public class DataFM
{
    [JsonProperty("email")]
    public string Email { get; set; }

    [JsonProperty("custom_fields")]
    public List<String> custom_fields { get; set; }

    [JsonProperty("state")]
    public string State { get; set; }
}

Custom fields is not a list of strings.

user1477388
– user1477388

2014-02-25 15:04:17 +00:00
Commented Feb 25, 2014 at 15:04 — user1477388
– user1477388, Commented Feb 25, 2014 at 15:04
See what this site (json2csharp.com) generates for you.

L.B
– L.B

2014-02-25 15:06:01 +00:00
Commented Feb 25, 2014 at 15:06 — L.B
– L.B, Commented Feb 25, 2014 at 15:06

Mario Stoilov · Accepted Answer · 2014-02-25 15:07:36Z

4

Custom fields is not a list of strings but a list of "field and value" pair.

Try this:

public class SubscriberGet
{
    [JsonProperty("status")]
    public string Status { get; set; }

    [JsonProperty("data")]
    public List<DataFM> Data { get; set; }
}

public class DataFM
{
    [JsonProperty("email")]
    public string Email { get; set; }

    [JsonProperty("custom_fields")]
    public List<CustomField> custom_fields { get; set; }

    [JsonProperty("state")]
    public string State { get; set; }
}
public class CustomField
{
    [JsonProperty("field")]
    public string field { get; set; }
    [JsonProperty("value")]
    public string value { get; set; }
}

edited Feb 25, 2014 at 15:07

Mario Stoilov

3,4475 gold badges34 silver badges51 bronze badges

answered Feb 25, 2014 at 15:05

user1477388

21.6k35 gold badges152 silver badges277 bronze badges

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Comments

Lutador · Accepted Answer · 2014-02-26 09:07:50Z

0

This is correct objects to handle my json string (thanks L.B. for link)

public class CustomField
{
    public string field { get; set; }
    public string value { get; set; }
}

public class Data
{
    public List<CustomField> custom_fields { get; set; }
    public string email { get; set; }
    public string state { get; set; }
}

public class RootObject
{
    public Data data { get; set; }
    public string status { get; set; }
}

answered Feb 26, 2014 at 9:07

Lutador

174 bronze badges

2 Comments

jgauffin Over a year ago

you should award user1477388 the answer as he specified just that. No need to create an identical answer.

Lutador Over a year ago

jgauffin: if you read answers one again (carefully) you will see differences. user1477388 codes doesn't work.

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