using System;

using System.Globalization;

using System.Text;

using System.Text.RegularExpressions;

using Newtonsoft.Json;

using Newtonsoft.Json.Linq;

​

public class Program

{

    public static void Main()

    {

        StringBuilder sResult = new StringBuilder();

        sResult.AppendLine("{\"hits\":{\"total\":4,\"max_score\":0.0,\"hits\":[]},\"aggregations\":{\"2\":{\"doc_count_error_upper_bound\":0,\"sum_other_doc_count\":0,\"buckets\":[{\"student\":\"123\",\"id\":2},{\"student\":\"9200\",\"id\":2}]}}}"); 

        var o = JObject.Parse(sResult.ToString());

​

        Console.WriteLine(o["aggregations"]["2"]["buckets"]);

​

    }   

}