[Fork] https://stackoverflow.com/questions/66495660/net-5-0-signature-change-of-system-text-json-jsonserializer-deserialize

CSharp · Console

/Program.cs

using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data;

using System.Text.Json;
using System.Text.Json.Serialization;
using System.Text.Json.Nodes;

using Newtonsoft.Json.Linq;

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

//https://stackoverflow.com/questions/66495660/net-5-0-signature-change-of-system-text-json-jsonserializer-deserialize

#nullable enable

    class TestClass
    {
        public static void Test()
		{
			Test("myKey");
			Console.WriteLine();
			Test("myMissingKey");
		}
		
        static void Test(string myKey)
        {
			var newtonsoftString = TestNewtonsoft(GetJson(), myKey);
			Console.WriteLine("Newtonsoft result for key {0}: {1}", myKey, newtonsoftString);

			var systemString = QueryJson(GetJson(), myKey, true);
			Console.WriteLine("System.Text.Json.Nodes result for key {0}: {1}", myKey, systemString);

			var docString = QueryJsonWithJsonDocument(GetJson(), myKey, true);
			Console.WriteLine("JsonDocument result for key {0}: {1}", myKey, docString);
			
			Assert.AreEqual(newtonsoftString, QueryJson(GetJson(), myKey, true));
			Assert.AreEqual(newtonsoftString, QueryJsonWithJsonDocument(GetJson(), myKey, true));
		}	
		
		static string? QueryJson(string json, string myKey, bool addComma = false)
		{
			// Parse to a JsonNode and cast to JsonObject.  An exception is thrown if not an object
			var node = JsonNode.Parse(json)!.AsObject(); 
			
			// Query the array of strings
			var query = (node[myKey] as JsonArray)?.Select(i => i?.ToString().ToUpper());
			if (query == null)
				return null; // Return null if key not found as per original code
			if (addComma)
				query = query.Concat(new [] { "" });

			// Join the string array into a single comma-separated string
			return string.Join(',', query);
		}

		static string? QueryJsonWithJsonDocument(string json, string myKey, bool addComma = false)
		{
			// Parse to a JsonNode and cast to JsonObject.  An exception is thrown if not an object
			using var doc = JsonDocument.Parse(json);

			// Query the array of strings
			var query = doc.RootElement.Get(myKey)?.EnumerateArray().Select(e => e.GetString()?.ToUpper());
			if (query == null)
				return null; // Return null if key not found as per original code
			if (addComma)
				query = query.Concat(new [] { "" });

			// Join the string array into a single comma-separated string
			return string.Join(',', query);
		}
		
		static string TestNewtonsoft(string json, string myKey)
		{
			string myList = null!;
           	object jsonObject = Newtonsoft.Json.JsonConvert.DeserializeObject(json, typeof(object));

            // Loop through the keys
            foreach (var jsonList in ((Newtonsoft.Json.Linq.JObject)(jsonObject)))
            {                   
                if (jsonList.Key == myKey)
                {                       
                    foreach (object o in (jsonList.Value.ToArray()))
                    {                           
                        myList += o.ToString().ToUpper() + ',';
                    }
                }
            }
			
			return myList;
		}
		
		static string GetJson() => @"{""myKey"":[""fir"",""dsdsd""],""status"":""ok""}";
	}

	//https://stackoverflow.com/a/61561343/3744182

	public static partial class JsonExtensions
	{
		public static JsonElement? Get(this JsonElement element, string name) => 
			element.ValueKind != JsonValueKind.Null && element.ValueKind != JsonValueKind.Undefined && element.TryGetProperty(name, out var value) 
				? value : (JsonElement?)null;
	}

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

			try
			{
				TestClass.Test();
			}
			catch (Exception ex)
			{
				Console.WriteLine("Failed with unhandled exception: ");
				Console.WriteLine(ex);
				throw;
			}
		}
	}