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 System.ComponentModel;

​

using Newtonsoft.Json;

using Newtonsoft.Json.Linq;

using Newtonsoft.Json.Converters;

using Newtonsoft.Json.Serialization;    

​

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

using NLog;

​

//https://stackoverflow.com/questions/56454590/im-having-problems-deserializing-enumerations/56485471#56485471

​

    public class LogLevelConverter : JsonConverter<LogLevel>

    {

        public override LogLevel ReadJson(JsonReader reader, Type objectType, LogLevel existingValue, bool hasExistingValue, JsonSerializer serializer)

        {

            switch (reader.MoveToContentAndAssert().TokenType)

            {

                case JsonToken.Null:

                    return null;

                case JsonToken.String:

                    return LogLevel.FromString((string)reader.Value);

                default:

                    throw new JsonSerializationException(string.Format("Unknown token {0}", reader.TokenType));

            }

        }

​

        public override void WriteJson(JsonWriter writer, LogLevel value, JsonSerializer serializer)

        {

            var logLevel = (LogLevel)value;

            writer.WriteValue(logLevel.Name);

        }

    }

​

    public static partial class JsonExtensions

    {

        public static JsonReader MoveToContentAndAssert(this JsonReader reader)

        {

            if (reader == null)

                throw new ArgumentNullException();

            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)

        {

            if (reader == null)

                throw new ArgumentNullException();

            if (!reader.Read())

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

            return reader;

        }

    }

​

    class TestClass

    {

        public static void Test()

        {

            Console.WriteLine(JsonConvert.SerializeObject(LogLevel.AllLevels));

            Console.WriteLine(JsonSerializer.Create().ContractResolver.ResolveContract(typeof(LogLevel)));

            Console.WriteLine("TypeDescriptor.GetConverter(typeof(LogLevel)) = {0}", TypeDescriptor.GetConverter(typeof(LogLevel)).GetType().FullName);

            Console.WriteLine("JsonConvert.SerializeObject(LogLevel.Info) = {0}", JsonConvert.SerializeObject(LogLevel.Info));

            Console.WriteLine("Convert.ChangeType(LogLevel.Error, typeof(string)) = {0}", Convert.ChangeType(LogLevel.Info, typeof(string)));

            Console.WriteLine("((IConvertible)LogLevel.Info).ToType(typeof(string), CultureInfo.InvariantCulture)) = {0}", ((IConvertible)LogLevel.Info).ToType(typeof(string), CultureInfo.InvariantCulture));

            Console.WriteLine();

            var seq = new LogLevelConverter();

            Test(new LogLevelConverter());

            TestLogInfo(new StringEnumConverter());

        }   

​

        static void Test(JsonConverter seq)

        {           

            Console.WriteLine("\nTesting IList<LogLevel> serialization with converter {0}:", seq);

​

            var allLevelsJson = JsonConvert.SerializeObject(LogLevel.AllLevels, seq);

            var allLevels = JsonConvert.DeserializeObject<IList<LogLevel>>(allLevelsJson, seq);

​

            Console.WriteLine(allLevelsJson);

            Assert.IsTrue(LogLevel.AllLevels.SequenceEqual(allLevels));

            TestLogInfo(seq);

        }

        static void TestLogInfo(JsonConverter seq)

        {           

            Console.WriteLine("Testing LogEventInfo deserialization with converter {0}:", seq);

            var msg = new

            {

                Body = GetJson()

            };

            var info = Newtonsoft.Json.JsonConvert.DeserializeObject<LogEventInfo>(msg.Body, seq);

            Console.WriteLine("LogEventInfo deserialized successfully with info.Level = {0}.\n", info.Level);

        }

        static string GetJson()

        {

            var json = @"{ ""date"": ""2019-06-04 21:48:24.0753"", ""level"": /* Some Comment */""Error"", ""message"": ""{\""ApplicationId\"":1390760,\""AppStatus\"":\""#PG2\"",\""Status\"":400,\""ErrorCode\"": 1053 }"", ""properties"": ""ResponseBody={\""ApplicationId\"":1390760,\""AppStatus\"":\""#PG2\"",\""Status\"":400,\""ErrorCode\"": 1053 }|GroupId=392934|ApplicationId=1390760|Status=400"", ""callsite"": ""HFD.Enterprise.Logging.Tests.LogTest.LoadTest"", ""logger"": ""WebApiLog"", ""machinename"": ""BRANDONHOSTVS"" }";

            return json;

        }

    }

​

#if false

    public static partial class JsonExtensions

    {

        public static JsonReader ReadToContentAndAssert(this JsonReader reader)

        {

            return reader.ReadAndAssert().MoveToContentAndAssert();

        }

    }

#endif

​

    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;

            }

        }

    }

​