在C＃中反序列化数组的数组

Question

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 (eg {"name":"value"}) to deserialize correctly. To fix this error either change the JSON to a JSON object (eg {"name":"value"}) or change the deserialized type to an array or a type that implements a collection interface (eg 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
}]

Answer 1

如果您仍想使用JSON序列化，则可以使用如下所示的内容。下面的一种适用于JSON

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

Answer 2

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);