“无法将当前JSON对象反序列化为类型

Question

So I have the following task - I need to deserialize an array of Jason objects which is stored in a recourse folder in my application.

So far I have accessed the recourse and stored it into a var:

var jsonData = Resources.SamplePoints;

Converted the array into a string:

string jsonObjts = Encoding.Default.GetString(jsonData);

And have tried to write the result into a list of Dictionaries

List<Dictionary<string, double>> EntityData = Newtonsoft.Json.JsonConvert.DeserializeObject<List<Dictionary<string, double>>>(jsonObjts);

However the above error message shows up when I run and test the application.

Can anyone please set me on the right path how to fix this?

A sample of the objects in question:

"samples": [
{
    "date": "2014-08-10T09:00:00Z",
    "temperature": 10,
    "pH": 4,
    "phosphate": 4,
    "chloride": 4,
    "nitrate": 10
},
{
    "date": "2014-08-12T09:05:00Z",
    "temperature": 10.5,
    "pH": 5,
    "chloride": 4,
    "phosphate": 4
},

Answer 1

Is there a reason you don't want to create a class to represent your JSON?

public class Rootobject
{
    public List<Sample> Samples { get; set; }
}

public class Sample
{
    public DateTime Date { get; set; }
    public float Temperature { get; set; }
    public int Ph { get; set; }
    public int Phosphate { get; set; }
    public int Chloride { get; set; }
    public int Nitrate { get; set; }
}

then you can deserialize:

var obj = JsonConvert.DeserializeObject<Rootobject>(json);

If you still want to use a Dictionary, I think you need something like this:

var obj = JsonConvert.DeserializeObject<Dictionary<string, List<Dictionary<string, object>>>>(json);

Answer 2

Your schema in generic type List<Dictionary<string, double>> and schema of json does not match. If you want to cast to List<Dictionary you can't use "samples": [ For this you'll need Dictionary<string,List<Dictionary . Also when you are trying to use double , date won't get parsed to double. So maybe you can try Dictionary<string, List<Dictionary<string, object>>> . Ideally you should create class for this structure instead of using generic List, Dictionary structure.If you are using visual studio, you can create these classes by using Edit->Paste special-> paste json as classes