How to deserialise complex JSON with JSON.net c#

Question

I have JSON with Dictionary of string-key with value-arrays. There are his structure below:

{
"NameA":{
    "ParametersA":[
        [104.3,5.368783],
        [104.212,2.57357],...,
    ],
    "ParametersB":[
        [104.3,5.368783],
        [104.212,2.57357],...,
    ]
},
"NameB":{
    "ParametersA":[
        [104.3,5.368783],
        [104.212,2.57357],...,
    ],
    "ParametersB":[
        [104.3,5.368783],
        [104.212,2.57357],...,
        ]
    },
"ThousandsNamesN":{[...]
    }
}

I create class for this to obtain data like this: Dictionaty<key=NameA, value=List<Parameters>> and parameters is another class with to arrays A and B.

This is my Root class:

    internal class RawDepth
{
    public Dictionary<string, Parameters> Names { get; set; }

    internal class Parameters
    {
        [JsonProperty("ParametersA")]
        public IList<Orders> A { get; set; }


        [JsonProperty("ParametersB")]
        public IList<ParamsArray> B { get; set; }
    }

    internal class ParamsArray
    {
        public decimal[,] _Orders { get; set; }
    }
}

I catchs a null reference exception. I tried create class different ways, but I still can't deserialise it. What I doing wrong?

Seperate your classes.

Kixoka
– Kixoka

2017-09-22 16:29:40 +00:00
Commented Sep 22, 2017 at 16:29 — Kixoka
– Kixoka, Commented Sep 22, 2017 at 16:29

Eser · Accepted Answer · 2017-09-22 16:44:22Z

1

Your model can be simply something like this

public class Parameters
{
    public List<List<decimal>> ParametersA { get; set; }
    public List<List<decimal>> ParametersB { get; set; }
}

Now you can deserialize as

var dict = JsonConvert.DeserializeObject<Dictionary<string, Parameters>>(json);

answered Sep 22, 2017 at 16:44

Eser

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Comments

Krzysztof Skowronek · Accepted Answer · 2017-09-22 16:45:38Z

1

There is a great tool json2csharp that lets you paste JSON and it generates C# classes from it. That's what I got from your sample:

public class NameA
{
    public List<List<double>> ParametersA { get; set; }
    public List<List<double>> ParametersB { get; set; }
}

public class NameB
{
    public List<List<double>> ParametersA { get; set; }
    public List<List<double>> ParametersB { get; set; }
}

public class RootObject
{
    public NameA NameA { get; set; }
    public NameB NameB { get; set; }
    public List<string> ThousandsNamesN { get; set; }
}

I think we can safely assume that NameA and NameB classes are the same.

I had to edit JSON a little fot it to work, so I will paste it below:

    {
"NameA":{
    "ParametersA":[
        [104.3,5.368783],
        [104.212,2.57357],
    ],
    "ParametersB":[
        [104.3,5.368783],
        [104.212,2.57357],
    ]
},
"NameB":{
    "ParametersA":[
        [104.3,5.368783],
        [104.212,2.57357],
    ],
    "ParametersB":[
        [104.3,5.368783],
        [104.212,2.57357],
        ]
    },
"ThousandsNamesN":["name1", "name2"]

}

So after taking into consideration what was your initail idea, your code should look like that:

public class Order
{
    public List<List<double>> ParametersA { get; set; }
    public List<List<double>> ParametersB { get; set; }
}

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

edited Sep 22, 2017 at 16:45

answered Sep 22, 2017 at 16:35

Krzysztof Skowronek

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2 Comments

Иван Погосов Over a year ago

I know, use the same service. But I have Thousands keys NameA, NameB, ...NameN where N can be 3000-4000. Early I deserialise same JSON to Dictionary where NameA..N was in another object, but in this JSON i have troubles...

Krzysztof Skowronek Over a year ago

I've edited my answer. You root object is a dictionary

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