Getting the Exception Newtonsoft.Json.JsonSerializationException when trying to serialize a JSON array

Question

I am trying to deserialize a JSON array in the format such as below

[
    {
        "Id": 111,
        "Name": "ABC"

    },
    {
        "Id": 222,
        "Name": "CDE"
    },
    {
        "Id": 333,
        "Name": "EFG"
    }
]

I Have the class

public class IDInformation
    {
        public List<IDInformation> ID{ get; set; }
    }

and I am trying to use it here where I am getting the Exception

Newtonsoft.Json.JsonSerializationException

var details= JsonConvert.DeserializeObject <IDInformation>(File);

I tried some of the fixes on some other SO questions as well but couldn't quite get what I wanted ..

What I am rying to do here is store all the ID in each of the separate JSON objects in a List (For example I want to iterate through this file and store 111,222,333 in a List )

Would really appreciate some help if anyone has come across something like this before.

Use json2csharp.com to generate classes for your JSON. You need a class with Id and Name property. — Chetan
– Chetan, Commented Nov 20, 2019 at 1:11

Chetan · Accepted Answer · 2019-11-20 01:15:55Z

4

You need to have following class to be able to deserialize the JSON successfully.

public class IDInformation
{
     public int Id {get;set;}
     public string Name {get;set;}
}

Then you can deserialize your JSON to a collection of IDInformation as following.

var list = JsonConvert.DeserializeObject <List<IDInformation>>(File);

From the list you can further create collection of ID of all the objects in the list as following.

var idList = list.Select(x => x.Id).ToList();

This will give you collection of integer values populated by Id values from the JSON array.

answered Nov 20, 2019 at 1:15

Chetan

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1 Comment

Devin Over a year ago

Great ! Thanks for the help. Understood where my mistake was

Aaron Zhong · Accepted Answer · 2019-11-20 01:25:28Z

0

The exception you're getting is because it cannot deserialize the json into your IDInformation class.

Change your IDInformation class to:

public class IDInformation
{
    public int Id { get; set; }
}

Then deserialize like so:

var details = JsonConvert.DeserializeObject<List<IDInformation>>(File);

Note how the field name Id matches the Json Id field.

answered Nov 20, 2019 at 1:25

Aaron Zhong

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2 Comments

RoadRunner Over a year ago

Name is missing from your class though?

Aaron Zhong Over a year ago

I might be mistaken but off the top of my head you do not need every json field in your class - so if you were not interested in Name you could just omit it from your class altogether.

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