C# Serialing a List to JON creates empty string

Question

I am missing something -- that I cannot figure out, when I serialize to text, it does pick up the text

Using VS 2022 C# 10 Net 6

Model Class
internal class Day30Model
{
internal string FileName { get; set; }
}

Initialization
List<Day30Model> day30List = new List<Day30Model>();

string outFileText = JsonSerializer.Serialize<List<Day30Model>>(day30List);

OutFileText = [{},{},{},{}]

Answer 1

Hello,
Welcome to Microsoft Q&A!

Serialing a List to JON creates empty string

The problem is FileName is internal getters/setters to prevent the user from accessing this functionality. If you want JsonConvert access to the internal functionality, you need add [JsonProperty] attribute for FileName proeprty

internal class Day30Model  
{  
    [JsonProperty]  
    internal string FileName { get; set; }  
}  

And then call newton json JsonConvert to serialize list items as string.

var jsonString  =     JsonConvert.SerializeObject(day30List);  

Thank you.

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Answer 2

Try this public string FileName { get; set; }

using System;
using System.Collections.Generic;
using System.IO;
using Newtonsoft.Json;

namespace Example1
{
    partial class Program
    {
        static void Main(string[] args)
        {
            DataOperations.Create();
            var list = DataOperations.List();
            foreach (var model in list)
            {
                Console.WriteLine(model.FileName);
            }
            Console.ReadLine();
        }
    }
    internal class Day30Model
    {
        public string FileName { get; set; }
    }

    class DataOperations
    {
        private static string _fileName = "Data.json";
        public static void Create()
        {
            List<Day30Model> list = new()
            {
                new Day30Model() {FileName = "First"},
                new Day30Model() {FileName = "Second"},
                new Day30Model() {FileName = "Third"},
            };

            File.WriteAllText(_fileName, JsonConvert.SerializeObject(list));
        }

        public static List<Day30Model> List() 
            => JsonConvert.DeserializeObject<List<Day30Model>>(
                File.ReadAllText(_fileName));
    }
}

Answer 3

Here is the json file

[
  {},
  {},
  {}
]

Using

internal class Day30Model
{
    internal string FileName { get; set; }
}

Results

[
  {
    "FileName": "First"
  },
  {
    "FileName": "Second"
  },
  {
    "FileName": "Third"
  }
]

Using

internal class Day30Model
{
    public string FileName { get; set; }
}

Project type plays no role with this issue.

Full source
https://github.com/karenpayneoregon/closet-code/tree/master/JsonNetAndNativeJsonDemo