How to remove specific attribute from json object c#

Question

My JSON object has a pages array and elements array inside it. elements array has many objects .each objects has correct answer attribute

I want to remove the correct answer attribute from the whole JSON.

I tried in this way but I couldn't remove the correct answer attribute.

    var o = (Newtonsoft.Json.Linq.JObject)JsonConvert.DeserializeObject(ob.Json);
                o.Property("pages").Remove();

{
 "pages": [
  {
   "name": "page1",
   "elements": [
    {
     "type": "radiogroup",
     "name": "question1",
     "correctAnswer": "item1",
     "choices": [
      "item1",
      "item2",
      "item3"
     ]
    },
    {
     "type": "radiogroup",
     "name": "question2",
     "correctAnswer": "item2",
     "choices": [
      "item1",
      "item2",
      "item3"
     ]
    },
   ]
}
]
}

Does this answer your question? Delete elements from a JSON

Pranav Singh
– Pranav Singh

2020-04-19 16:08:43 +00:00
Commented Apr 19, 2020 at 16:08 — Pranav Singh
– Pranav Singh, Commented Apr 19, 2020 at 16:08

Anu Viswan · Accepted Answer · 2020-01-21 10:53:50Z

2

You could use JToken.Remove together with Linq to remove the correctAnswers. For example,

var jo = JObject.Parse(json);
var answers = jo.Descendants()
           .Where(x => x.Type == JTokenType.Property)
           .Cast<JProperty>()
           .Where(x=>x.Name=="correctAnswer").ToList();
foreach(var answer in answers)
{
    answer.Remove();
}
var filterJson = jo.ToString();

answered Jan 21, 2020 at 10:53

Anu Viswan

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Comments

Tân · Accepted Answer · 2020-01-21 04:38:48Z

If you want to remove correctAnswer property inside that json, you can make a loop for each element item and set correctAnswer to null:

using System.Collections.Generic;
using Newtonsoft.Json;

namespace Program
{
    class Element
    {
        public string type { get; set; }
        public string name { get; set; }
        public string correctAnswer { get; set; }
        public IList<string> choices { get; set; }
    }

    class Item
    {
        public string name { get; set; }
        public IList<Element> elements { get; set; }
    }

    class MyClass
    {
        public IList<Item> pages { get; set; }
    }

    class Program
    {
        static void Main()
        {
            var data = "{" +
                "'pages':[" +
                    "{'name':'page1'," +
                    "'elements':[" +
                        "{" +
                            "'type':'radiogroup'," +
                            "'name':'question1'," +
                            "'correctAnswer':'item1'," +
                            "'choices':['item1','item2','item3']" +
                        "}," +
                        "{" +
                            "'type':'radiogroup'," +
                            "'name':'question2'," +
                            "'correctAnswer':'item2'," +
                            "'choices':['item1','item2','item3']" +
                        "}" +
                    "]" +
                    "}]" +
                "}";

            var obj = JsonConvert.DeserializeObject<MyClass>(data);

            foreach (var page in obj.pages)
            {
                foreach (var element in page.elements)
                {
                    element.correctAnswer = null;
                }
            }
        }
    }
}

Another way, in this example, we can remove correctAsnwer property from the class Element. Then the result after parsing the string to json object, correctAnswer property won't be accessed.

class Element
{
    public string type { get; set; }
    public string name { get; set; }
    // public string correctAnswer { get; set; }
    public IList<string> choices { get; set; }
}

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