A quick data service to save in memory things to json files

DataService.cs

using System.Diagnostics;
using System.Text.Json;
using MyNamespce.Models;

namespace MyNamespce.Services;

public class Data
{
    private static readonly string _dataFolder = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.UserProfile), "PodPod", "Data");
    public static List<Podcast> Podcasts { get; set; }

    private Data(){}

    public static void init(){
        Data.Podcasts = new List<Podcast>();
    }


    public static bool SaveFileExists(string fileName)
    {
        string filePath = Path.Combine(_dataFolder, $"{fileName}.json");
        return File.Exists(filePath);
    }


    public static void SaveToJsonFile<T>(T data, string fileName)
    {
        Debug.WriteLine("Saving to file");
        if (!Directory.Exists(_dataFolder))
        {
            Directory.CreateDirectory(_dataFolder);
        }

        try {
            string filePath = Path.Combine(_dataFolder, $"{fileName}.json");
            string json = JsonSerializer.Serialize(data);
            File.WriteAllText(filePath, json);
            Debug.WriteLine("Saved to file");
        } catch (Exception e){
            Console.WriteLine(e.Message);
            Debug.WriteLine("Failed to save to file");
        }
    }

    public static T LoadFromJsonFile<T>(string fileName)
    {
        string filePath = Path.Combine(_dataFolder, $"{fileName}.json");
        
        if (File.Exists(filePath)){
            try {
                string json = File.ReadAllText(filePath);
                return JsonSerializer.Deserialize<T>(json);
            }catch (Exception e){
                Console.WriteLine(e.Message);   
            }
        }
        return default;
    }
}

Init your data service on app load

Data.Init()

Load saved data into the service :

Data.Podcasts = Data.LoadFromJsonFile<List<Podcast>>("podcasts");

Reference this loaded data around the app as you would any other c# list. Call the save method when appropriate.

Data.SaveToJsonFile(Data.Podcasts, "podcasts");