using System;

using System.Collections;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.IO;

using System.Threading;

using System.Collections.ObjectModel;

using System.Reflection;

​

using Newtonsoft.Json;

using Newtonsoft.Json.Linq;

using Newtonsoft.Json.Converters;

using Newtonsoft.Json.Serialization;                

​

// https://stackoverflow.com/questions/41513888/using-jpath-hw-do-i-select-a-json-value-from-within-aother-json-string

​

    class TestClass

    {

        internal static void Test()

        {

            var json = @"{

    ""results"": [{

        ""paramName"": ""OutputPolyline"",

        ""dataType"": ""String"",

        ""value"": ""#{\""hasM\"":true,\""paths\"":[[[135.24,246.13,null],[135.24,246.13,null],[135.24,246.13,null]]]}""

    }],

    ""messages"": []

}";

            JObject obj = JObject.Parse(json);

            JToken token = obj.SelectToken("$.results[?(@.paramName == 'OutputPolyline')]['value']");

            Console.WriteLine(token.Path + " -> " + token);         

            var paths = JToken.Parse(token.ToString().Trim('#')).SelectToken("paths");

            Console.WriteLine(paths.Path + " -> " + paths);         

        }

    }

    public class Program

    {

        public static void Main()

        {

            Console.WriteLine("Json.NET version: " + typeof(JsonSerializer).Assembly.FullName);

            TestClass.Test();

        }

    }