Can I use a JSON string in C#?

Question

Rebuilding a java app for android I built in Windows Visual Studio. Need help on using JSON strings in Visual Studio Visual C# Forms app (.NET Framework).

I'm creating a new file format to be able to transfer data to different robots in my company. I used a list map for my android app and the file contains a JSON string. Is it possible to add the string into a list on Visual C# Forms (.NET Framework) for view in a list box? Sample is provided.

[{"VALUE":"03","ATTRIBUTE":"Laayelbxw"},
 {"VALUE":"01","ATTRIBUTE":"Leruaret"},
 {"VALUE":"08","ATTRIBUTE":"Lscwbryeiyabwaa"},
 {"VALUE":"09","ATTRIBUTE":"Leruxyklrwbwaa"}]

Adding an important note: make sure all the object's attributes are instanciated because JsonConvert.DeserializeObject() will fail if any of them are not set to a reference. — Mahdi Benaoun
– Mahdi Benaoun, Commented Feb 12, 2019 at 15:29
@MahdiBenaoun what do you mean by "all the object's attributes are instanciated" ? Do you mean all the json members are set? — Cid
– Cid, Commented Feb 12, 2019 at 16:46

Cid · Accepted Answer · 2019-02-12 14:43:52Z

5

Of course you can !

The simpliest way I know to deserialize a JSON in C# is using the Newtonsoft Json nuget package.

In example :

/*
 * This class represent a single item of your collection.
 * It has the same properties name than your JSON string members
 * You can use differents properties names, but you'll have to use attributes
 */
class MyClass
{
    public int VALUE { get; set; }
    public string ATTRIBUTE { get; set; }
}

class Program
{
    static void Main(string[] args)
    {
        var myJSON = "[{\"VALUE\":\"03\",\"ATTRIBUTE\":\"Laayelbxw\"},{\"VALUE\":\"01\",\"ATTRIBUTE\":\"Leruaret\"},{\"VALUE\":\"08\",\"ATTRIBUTE\":\"Lscwbryeiyabwaa\"},{\"VALUE\":\"09\",\"ATTRIBUTE\":\"Leruxyklrwbwaa\"}]";

        //                 V---------V----- Namespace is Newtonsoft.Json
        var MyCollection = JsonConvert.DeserializeObject<List<MyClass>>(myJSON);
        // Tadaam ! You now have a collection of MyClass objects created from that json string

        foreach (var item in MyCollection)
        {
            Console.WriteLine("Value : " + item.VALUE);
            Console.WriteLine("Attribute : " + item.ATTRIBUTE);
        }
        Console.Read();
    }
}

Output

Value : 3
Attribute : Laayelbxw
Value : 1
Attribute : Leruaret
Value : 8
Attribute : Lscwbryeiyabwaa
Value : 9
Attribute : Leruxyklrwbwaa

edited Feb 12, 2019 at 14:43

answered Feb 12, 2019 at 14:31

Cid

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3 Comments

João Paulo Amorim Over a year ago

thanks for a best answer than mine, it is well explained ^^

Cid Over a year ago

I'm curious to know why I've been downvoted. Any clue someone?

Aria Over a year ago

It is interested for me also, hope @downvoter explain if there any problem, it may because of duplication, do you think so ?

João Paulo Amorim · Accepted Answer · 2019-02-12 14:31:58Z

3

It's gonna be something like this.

public class JsonExample
{
    public int VALUE { get; set; }

    public string ATTRIBUTE { get; set; }
}

public void GetJson()
{
    string json = "your string";
    var xpto = JsonConvert.DeserializeObject<List<JsonExample>>(json);
}

answered Feb 12, 2019 at 14:31

João Paulo Amorim

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2 Comments

Aria Over a year ago

Your answer is also good, when you was trying to post it, @Cid post his own faster than you.

Cid Over a year ago

Yup, I've been a bit faster, but you still deserve an upvote since your answer is accurate

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