CODEWITHSUNDEEP
c#asp.netarraysjsonasp.net-mvc
Abdul Rehman Ch
Abdul Rehman Ch

Reputation: 157

Deserialize Array of arrays in C#

I have a following json: need to Deserialize in C#. 

[
    [{
        "ElementName": "H1 ",
        "lat": 51.394319720562514,
        "lng": -109.99996662139893
    }, {
        "ElementName": "H1 ",
        "lat": 51.394319720562514,
        "lng": -109.99995589256287
    }],    
    [{
        "ElementName": "H2 ",
        "lat": 51.394319720562514,
        "lng": -109.99996662139893
    }, {
        "ElementName": "H2 ",
        "lat": 51.394319720562514,
        "lng": -109.99995589256287
    }]
]

I have write the following code to desirialize it.

public  class PointElement
{
    public string ElementName { get; set; }

    public double lat { get; set; }
    public double lng { get; set; }
}

var testPointList = JsonConvert.DeserializeObject<List<PointElement>>(testNewJson);

but console shows the error

Controllers.PointElementRecord' because the type requires a JSON object (e.g. {"name":"value"}) to deserialize correctly. To fix this error either change the JSON to a JSON object (e.g. {"name":"value"}) or change the deserialized type to an array or a type that implements a collection interface (e.g. ICollection, IList) like List that can be deserialized from a JSON array. JsonArrayAttribute can also be added to the type to force it to deserialize from a JSON array. Path '[0]', line 1, position 2.

need solution how to deserialize this kind array string as this code runs fine for below array

[{
        "ElementName": "H1 ",
        "lat": 51.394319720562514,
        "lng": -109.99996662139893
    }, {
        "ElementName": "H1 ",
        "lat": 51.394319720562514,
        "lng": -109.99995589256287
}]

Upvotes: 0

Views: 1227

Answers (2)

praga2050
praga2050

Reputation: 773

If you still want to Serialize the with your JSON you can use like below The below one works for your JSON

JsonConvert.DeserializeObject<List<PointElement[]>>(testJson);

Upvotes: 2

Nhan Phan
Nhan Phan

Reputation: 1302

If you want to create a list of list PointElement as your json descible, then the json converter should convert from List> instead of List:

var testPointList = JsonConvert.DeserializeObject<List<List<PointElement>>>(testNewJson)

Or incase you want to create a single list of PointElement then your json need to brackets [] which has nested array:

[
    {
        "ElementName": "H1 ",
        "lat": 51.394319720562514,
        "lng": -109.99996662139893
    }, {
        "ElementName": "H1 ",
        "lat": 51.394319720562514,
        "lng": -109.99995589256287
    },    
    {
        "ElementName": "H2 ",
        "lat": 51.394319720562514,
        "lng": -109.99996662139893
    }, {
        "ElementName": "H2 ",
        "lat": 51.394319720562514,
        "lng": -109.99995589256287
    }
]

and then you can call 

var testPointList = JsonConvert.DeserializeObject<List<PointElement>>(testNewJson);

Upvotes: 0

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