using System;

using Newtonsoft.Json;

using System.Collections.Generic;

using System.Linq;

​

public class Program

{

    public class Something

    {

        public string code

        {

            get;

            set;

        }

​

        public object value

        {

            get;

            set;

        }

    }

​

    public class RootObject

    {

        public List<Something> List

        {

            get;

            set;

        }

    }

​

    public class NewObject

    {

        public Dictionary<string, object> List

        {

            get;

            set;

        }

    }

​

    public static void Main()

    {

        var input = "{\r\n\"list\": [\r\n{\r\n    \"code\": \"c1_1\",\r\n    \"value\": \"1\"\r\n},\r\n{\r\n    \"code\": \"c1_2\",\r\n    \"value\": false\r\n},\r\n\r\n]\r\n}";

        var rootObject = JsonConvert.DeserializeObject<RootObject>(input);

        var dictionary = rootObject.List.ToDictionary(x => x.code, x => x.value);

        var newObject = new NewObject() {List = dictionary};

        var output = JsonConvert.SerializeObject(newObject, Formatting.Indented);

        Console.WriteLine(output);

    }

}