using System;

using System.Collections;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Runtime.Serialization.Formatters;

using System.IO;

using System.Data;

using System.ComponentModel.DataAnnotations;

using System.Globalization;

using System.Reflection;

​

using Newtonsoft.Json;

using Newtonsoft.Json.Linq;

using Newtonsoft.Json.Converters;

using Newtonsoft.Json.Serialization;    

​

using NUnit.Framework; // Throws NUnit.Framework.AssertionException

​

//https://stackoverflow.com/questions/56093739/json-deserialize-is-not-working-with-list-object

​

    public class SampleClass

    {

        public float temperature { get; set; }

        public int pH { get; set; }

        public int phosphate { get; set; }

        public int chloride { get; set; }

        public int nitrate { get; set; }

​

    }

​

    class TestClass

    {

        public static void Test()

        {

            var jsonStr = GetJson();

            var result = JsonConvert.DeserializeAnonymousType(jsonStr, new { samples = default(List<SampleClass>) })

                .samples;

            Console.WriteLine(JsonConvert.SerializeObject(result, Formatting.Indented));

        }   

        static string GetJson()

        {

            var json = @"{

   ""samples"":[

      {

         ""date"":""2014-08-10T09:00:00Z"",

         ""temperature"":10,

         ""pH"":4,

         ""phosphate"":4,

         ""chloride"":4,

         ""nitrate"":10

      },

      {

         ""date"":""2014-08-12T09:05:00Z"",

         ""temperature"":10.5,

         ""pH"":5,

         ""chloride"":4,

         ""phosphate"":4

      },

      {

         ""date"":""2014-08-14T09:02:00Z"",

         ""temperature"":10.8,

         ""pH"":3,

         ""phosphate"":4

      },

      {

         ""date"":""2014-08-16T09:02:00Z"",

         ""temperature"":11.2,

         ""pH"":6,

         ""chloride"":4

      },

      {

         ""date"":""2014-08-18T08:58:00Z"",

         ""temperature"":10.9,

         ""pH"":10,

         ""chloride"":4,

         ""phosphate"":4,

         ""nitrate"":10

      },

      {

         ""date"":""2014-08-20T09:10:00Z"",

         ""temperature"":9.3,

         ""pH"":6,

         ""phosphate"":4

      },

      {

         ""date"":""2014-08-22T09:01:00Z"",

         ""temperature"":9.5,

         ""pH"":10,

         ""chloride"":4,

         ""phosphate"":4,

         ""nitrate"":10

      }

   ]

}

";

            return json;

        }

    }

​

    public class Program

    {

        public static void Main()

        {

            Console.WriteLine("Environment version: " + Environment.Version);

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

            Console.WriteLine();

​

            try

            {

                TestClass.Test();

            }

            catch (Exception ex)

            {

                Console.WriteLine("Failed with unhandled exception: ");

                Console.WriteLine(ex);

                throw;

            }

        }

    }

​