using System;

using System.Collections;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Data;

​

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/77427311/c-sharp-having-trouble-iterating-through-a-dynamic-json

​

    class TestClass

    {

        public static void Test()

        {

            var jsonString = GetJson();

            //var jsonString = response.Content.ReadAsStringAsync().Result;

            var result = JsonConvert.DeserializeObject<JToken>(jsonString);

            var dates = result.SelectTokens("results.items[*].item[*]")

                .Select(i => new { date1 = i["date1"].ToObject<DateOnly>(), date2 = i["date2"].ToObject<DateOnly>() });

​

            // Prints

            // Date1=01/01/2022, Date2=01/05/2022.

            // Date1=04/01/2022, Date2=04/07/2021.

            foreach (var item in dates)

            {

                Console.WriteLine($"Date1={item.date1}, Date2={item.date2}.");

            }

            Assert.AreEqual(2, dates.Count());

            var keyNames = result.SelectTokens("results.items[*].key.keyName");

            Console.WriteLine("Keynames: {0}", JsonConvert.SerializeObject(keyNames));

        }   

        static string GetJson() =>

            """

            {

                "results": {

                    "copyright": "Copyright",

                    "items": [{

                        "info": {

                            "longname": "XXX",

                            "shortname": "YYY"

                        },

                        "item": [{

                            "date1": "2022-01-01",

                            "date2": "2022-01-05",

                        }, {

                            "date1": "2022-04-01",

                            "date2": "2021-04-07",

                        }],

                        "key": {

                            "keyName": "AAA",

                            "keySym": "BBB",

                        },

                        "symString": "BBB"

                    }],

                    "count": 1

                }

            }

            """;

    }

​

    public static partial class JsonExtensions

    {

        public static JsonReader AssertTokenType(this JsonReader reader, JsonToken tokenType) => 

            reader.TokenType == tokenType ? reader : throw new JsonSerializationException(string.Format("Unexpected token {0}, expected {1}", reader.TokenType, tokenType));

        public static JsonReader ReadToContentAndAssert(this JsonReader reader) =>

            reader.ReadAndAssert().MoveToContentAndAssert();

​

        public static JsonReader MoveToContentAndAssert(this JsonReader reader)

        {

            ArgumentNullException.ThrowIfNull(reader);

            if (reader.TokenType == JsonToken.None)       // Skip past beginning of stream.

                reader.ReadAndAssert();

            while (reader.TokenType == JsonToken.Comment) // Skip past comments.

                reader.ReadAndAssert();

            return reader;

        }

​

        public static JsonReader ReadAndAssert(this JsonReader reader)

        {

            ArgumentNullException.ThrowIfNull(reader);

            if (!reader.Read())

                throw new JsonReaderException("Unexpected end of JSON stream.");

            return reader;

        }

    }

​

    public class Program

    {

        public static void Main()

        {

            Console.WriteLine("Environment version: {0} ({1}), {2}", System.Runtime.InteropServices.RuntimeInformation.FrameworkDescription , Environment.Version, Environment.OSVersion);

            Console.WriteLine("{0} version: {1}", typeof(JsonSerializer).Namespace, typeof(JsonSerializer).Assembly.FullName);

            Console.WriteLine();

​

            try

            {

                TestClass.Test();

            }

            catch (Exception ex)

            {

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

                Console.WriteLine(ex);

                throw;

            }

        }

    }

​