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/57859217/extract-few-values-from-json-array

​

    public class Entity

    {

        public string DisplayName { get; set; }

        public int EntityId { get; set; }

        public string EntityType { get; set; }

        public bool Active { get; set; }

    }

​

    public class SubmittedBy

    {

        public string Identifier { get; set; }

        public string DisplayName { get; set; }

    }

​

    public class Comment

    {

        public string Text { get; set; }

        public string Html { get; set; }

    }

​

    public class File

    {

        public bool IsRead { get; set; }

        public bool IsFlagged { get; set; }

        public bool IsDeleted { get; set; }

        public int FileId { get; set; }

        public string FileName { get; set; }

        public int Size { get; set; }

    }

​

    public class Submission

    {

        public int Id { get; set; }

        public SubmittedBy SubmittedBy { get; set; }

        public DateTime SubmissionDate { get; set; }

        public Comment Comment { get; set; }

        public IList<File> Files { get; set; }

    }

​

    public class Example

    {

        public Entity Entity { get; set; }

        public int Status { get; set; }

        public object Feedback { get; set; }

        public IList<Submission> Submissions { get; set; }

        public DateTime CompletionDate { get; set; }

    }

​

    class TestClass

    {

        public static void Test()

        {

            var response = new 

            {

                Content = GetJson(),

            };

            var thisasa = JsonConvert.DeserializeObject<List<Example>>(response.Content)

                .Select(o => o.Entity.EntityId)

                .ToList();

            thisasa.Dump();

        }   

        static string GetJson()

        {

            var json = @"[{

    ""Entity"": {

        ""DisplayName"": ""FullName"",

        ""EntityId"": 123,

        ""EntityType"": ""User"",

        ""Active"": true

    },

    ""Status"": 1,

    ""Feedback"": null,

    ""Submissions"": [{

        ""Id"": 27,

        ""SubmittedBy"": {

            ""Identifier"": ""123"",

            ""DisplayName"": ""FullName""

        },

        ""SubmissionDate"": ""2019-08-01T15:25:04.130Z"",

        ""Comment"": {

            ""Text"": """",

            ""Html"": """"

        },

        ""Files"": [{

            ""IsRead"": false,

            ""IsFlagged"": false,

            ""IsDeleted"": false,

            ""FileId"": 1245,

            ""FileName"": ""1.2.10.png"",

            ""Size"": 144407

        }, {

            ""IsRead"": false,

            ""IsFlagged"": false,

            ""IsDeleted"": false,

            ""FileId"": 292,

            ""FileName"": ""1.3.8.png"",

            ""Size"": 127869

        }]

    }],

    ""CompletionDate"": ""2019-08-01T15:25:04.130Z""

}, {

    ""Entity"": {

        ""DisplayName"": ""FullName"",

        ""EntityId"": 123,

        ""EntityType"": ""User"",

        ""Active"": true

    },

    ""Status"": 1,

    ""Feedback"": null,

    ""Submissions"": [{

        ""Id"": 41,

        ""SubmittedBy"": {

            ""Identifier"": ""123"",

            ""DisplayName"": ""FullName""

        },

        ""SubmissionDate"": ""2019-08-03T03:31:43.807Z"",

        ""Comment"": {

            ""Text"": "" \nAlex"",

            ""Html"": ""<p></p>\n<p>Alex</p>""

        },

        ""Files"": [{

            ""IsRead"": false,

            ""IsFlagged"": false,

            ""IsDeleted"": false,

            ""FileId"": 313,

            ""FileName"": ""Capture 1.2.10 Questions.PNG"",

            ""Size"": 97722

        }]

    }],

    ""CompletionDate"": ""2019-08-03T03:31:43.807Z""

​

}]

";

            return json;

        }

    }

​

​

    public class Program

    {

        public static void Main()

        {

            Console.WriteLine("Environment version: {0} ({1})", System.Runtime.InteropServices.RuntimeInformation.FrameworkDescription , GetNetCoreVersion());

            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;

            }

        }

        public static string GetNetCoreVersion()

        {

            //https://techblog.dorogin.com/how-to-detect-net-core-version-in-runtime-ecd65ad695be

            //

            var assembly = typeof(System.Runtime.GCSettings).GetTypeInfo().Assembly;

            var assemblyPath = assembly.CodeBase.Split(new[] { '/', '\\' }, StringSplitOptions.RemoveEmptyEntries);

            int netCoreAppIndex = Array.IndexOf(assemblyPath, "Microsoft.NETCore.App");

            if (netCoreAppIndex > 0 && netCoreAppIndex < assemblyPath.Length - 2)

                return assemblyPath[netCoreAppIndex + 1];

            return null;

        }

    }

​