.Net Core 3.0 JsonSerializer populate existing object

Question

I\'m preparing a migration from ASP.NET Core 2.2 to 3.0.

As I don\'t use more advanced JSON features (but maybe one as described below), and 3.0 now comes with a buil

Answer 1

I am not sure if this will fix your problem, but it should work as a temporary workaround. All I did was write a simple class with a populateobject method in it.

public class MyDeserializer
{
    public static string PopulateObject(string[] jsonStrings)
    {
        Dictionary fullEntity = new Dictionary();

        if (jsonStrings != null && jsonStrings.Length > 0)
        {
            for (int i = 0; i < jsonStrings.Length; i++)
            {

                var myEntity = JsonSerializer.Parse>(jsonStrings[i]);

                foreach (var key in myEntity.Keys)
                {
                    if (!fullEntity.ContainsKey(key))
                    {
                        fullEntity.Add(key, myEntity[key]);
                    }
                    else
                    {
                        fullEntity[key] = myEntity[key];
                    }
                }
            }
        }

        return JsonSerializer.ToString(fullEntity);
    }    
}

I put it into a console app for testing purposes. Below is the entire app if you would like to test it yourself.

using System;
using System.Text.Json;
using System.IO;
using System.Text.Json.Serialization;

namespace JsonQuestion1
{
    class Program
    {
        static void Main(string[] args)
        {
            // Only used for testing
            string path = @"C:\Users\Path\To\JsonFiles";
            string st1 = File.ReadAllText(path + @"\st1.json");
            string st2 = File.ReadAllText(path + @"\st2.json");
            // Only used for testing ^^^

            string myObject = MyDeserializer.PopulateObject(new[] { st1, st2 } );

            Console.WriteLine(myObject);
            Console.ReadLine();

        }
    }

    public class MyDeserializer
    {
    public static string PopulateObject(string[] jsonStrings)
    {
        Dictionary fullEntity = new Dictionary();

        if (jsonStrings != null && jsonStrings.Length > 0)
        {
            for (int i = 0; i < jsonStrings.Length; i++)
            {

                var myEntity = JsonSerializer.Parse>(jsonStrings[i]);

                foreach (var key in myEntity.Keys)
                {
                    if (!fullEntity.ContainsKey(key))
                    {
                        fullEntity.Add(key, myEntity[key]);
                    }
                    else
                    {
                        fullEntity[key] = myEntity[key];
                    }
                }
            }
        }

            return JsonSerializer.ToString(fullEntity);
      }
    }
}

Json File Contents:

st1.json

{
    "Title": "Startpage",
    "Link": "/index"
}

st2.json

{
  "Title": "Startpage",
  "Head": "Latest news",
  "Link": "/news"
}