How to Deserialize Json Object - C#

Question

A web service returns JSON object as blew:

JsonString = "{"d":"[{\"sname\":\"S1\",\"region\":\"R1\",\"name\":\"Q1\"},{\"sname\":\"S2\",\"region\":\"R2\",\"name\":\"Q2\"}]"}"

I tried to Deserialize by doing this:

Define the objects

public class RootResponseClass
{
    public ResponseParametersClass[] d { get; set; }
}

public class ResponseParametersClass
{
    public string sname { get; set; }
    public string region { get; set; }
    public string name { get; set; }
}

Write the Deserialize Method

 JavaScriptSerializer ser2 = new JavaScriptSerializer();

 RootResponseClass obj = new RootResponseClass();

 obj = ser2.Deserialize<RootResponseClass>(JsonString);

But It is gives error "Cannot convert object of type 'System.String' to type 'NAS.Helpers.ResponseParametersClass[]", So how can i do it!

Solution

 public class RootResponseClass
    {
        public string d { get; set; }
    }

And for deserialize method :

JavaScriptSerializer ser2 = new JavaScriptSerializer();
RootResponseClass obj = new RootResponseClass();
obj = ser2.Deserialize<RootResponseClass>(JsonString);

List<ResponseParametersClass> obj2 = new List<ResponseParametersClass>();
obj2 = ser2.Deserialize<List<ResponseParametersClass>>(obj.d.ToString());

d in the Json doesn't contain an array, but a string. If it was an array, it'd start like [ instead of "[. So it seems like the Json contains another Json string. — Dnomyar96, Oct 10 '18 at 11:15
I tired the both, and the other answer works too but using another method, but like you said the problem wasn't in the method, it is in how i deal with the json string, so i did what you recommended in comment and it works fine. — Fatma elzahraa, Oct 10 '18 at 11:40
Possible duplicate of [Deserializing JSON to .NET object using Newtonsoft (or LINQ to JSON maybe?)](https://stackoverflow.com/questions/4749639/deserializing-json-to-net-object-using-newtonsoft-or-linq-to-json-maybe) — DerStarkeBaer, Oct 10 '18 at 11:41

H.Mikhaeljan · Answer 1 · 2018-10-10T11:36:28.413

3

You can use the package using Newtonsoft.Json; for deserializing JSON

example

JsonString = "{"d":"[{\"sname\":\"S1\",\"region\":\"R1\",\"name\":\"Q1\"},{\"sname\":\"S2\",\"region\":\"R2\",\"name\":\"Q2\"}]"}";

var foo = JsonConvert.DeserializeObject<RootResponseClass>(JsonString);

foo is your deserialized object.

EDIT

As extra information why the initial way is not working is because your array is starting with quotes so its recognized as a string. After the "{"d": should be just [] instead of "[]"

Thanx Dnomyar96 for pointing that extra out.

edited Oct 10 '18 at 11:36

answered Oct 10 '18 at 11:20

H.Mikhaeljan

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1

This won't actually help OP. His problem is in the Json string, not the method of deserializing. His method works just as well as this. – Dnomyar96 Oct 10 '18 at 11:22
@H. Mikhaeljan, please explain array was not working and you change it to list to make it work, I am not getting this thing. – Anirudha Gupta Oct 10 '18 at 11:28
@AnirudhaGupta The list is not making the change it can also just be an array im just more used to work with lists excuse me for the confusing change. – H.Mikhaeljan Oct 10 '18 at 11:34
@H.Mikhaeljan ok – Anirudha Gupta Oct 10 '18 at 11:56

score 2 · Accepted Answer · answered Oct 10 '18 at 11:26

Your Json string seems to contain another Json string. So in order to deserialize this, you'd need to deserialize as you're doing now, but change the ResponseParametersClass to string.

Then you'd need to deserialize the string you just got (as a List<ResponseParametersClass>). So in this case you'd need to deserialize in two seperate steps.

How to Deserialize Json Object - C#

2 Answers2