how to json convert to object and get data loop - asp.net

Question

i have following json.. i was convert my json into objectclass and get subjectid and class id loop through but its not working. i want subjectid and classid please help me how do this.i am new in c# please help me i am very thanful to you guys
[{
"teacherid": 1,
"teachername": "Addi Teacher",
"class": {
"class_id": 2,
"class_name": "Class 9"
},
"subjecname": {
"subject_id": 2,
"Subject_Name": "chemistry"
},
"$$hashKey": "object:10"
}, {
"teacherid": 1,
"teachername": "Addi Teacher",
"class": {
"class_id": 2,
"class_name": "Class 9"
},
"subjecname": {
"subject_id": 4,
"Subject_Name": "Science"
},
"$$hashKey": "object:12"
}, {
"teacherid": 1,
"teachername": "Addi Teacher",
"class": {
"class_id": 2,
"class_name": "Class 9"
},
"subjecname": {
"subject_id": 3,
"Subject_Name": "P.Study"
},
"$$hashKey": "object:14"
}]
//c# class
public class Class
{
public int class_id { get; set; }
public string class_name { get; set; }
}
public class Subjecname
{
public int subject_id { get; set; }
public string Subject_Name { get; set; }
}
public class RootObject
{
public int teacherid { get; set; }
public string teachername { get; set; }
public Class #class { get; set; }
public Subjecname subjecname { get; set; }
public string __invalid_name__$$hashKey { get; set; }
}
// code
subjectobject objsub = new JavaScriptSerializer().Deserialize<subjectobject>(jsonstring);

Answer 1

Do the following steps to achieve what you need:
Use my answer here to generate the C# classes for your JSON. The one you have created manually does not reflect your JSON accurately.
Use NewtonSoft NuGet package to deserialize from json to C# type
Then using Linq or a loop get the properties you need.
Here is what you r code will look like:
var obj = JsonConvert.DeserializeObject<Rootobject>("your json");
var result = obj.Property1.Select(x =>
new { ClassId = x._class.class_id, SubjectId = x.subjecname.subject_id });
By the way, this is what my linked answer will generate for you:
public class Rootobject
{
public Class1[] Property1 { get; set; }
}
public class Class1
{
public int teacherid { get; set; }
public string teachername { get; set; }
public Class2 _class { get; set; }
public Subjecname subjecname { get; set; }
public string hashKey { get; set; }
}
public class Class2
{
public int class_id { get; set; }
public string class_name { get; set; }
}
public class Subjecname
{
public int subject_id { get; set; }
public string Subject_Name { get; set; }
}