using System;

using System.Linq;

using System.Collections.Generic;

using Newtonsoft.Json;

public class Program

{

    public static void Main()

    {

        var docs = GetDocuments();

        foreach(var doc in docs){

            doc["a"] = new string[]{"Hello", "World!"};

            var docInLoop = JsonConvert.SerializeObject(doc);

            Console.WriteLine(docInLoop);

        }

        var serialized = JsonConvert.SerializeObject(docs);

        Console.WriteLine("===========================================================================================");

        Console.WriteLine(serialized);

        Console.WriteLine("===========================================================================================");

        var bar = docs.First()["a"] as string[];        

        Console.Write("First entry of first document is string[]?");

        Console.WriteLine(bar==null? " No" : "Yes");

    }

    public static IEnumerable<Document> GetDocuments(){

        return Enumerable.Range(0, 10).Select(i => {

        var doc = new Document();

        doc["a"] = new int[]{1,2,3,4,5,6};

        return doc;

        });

    }

    public class Document : Dictionary<string, object>{}

}