MyFirstMAUI/MyFirstMauiApp/NotesNet8/Models/Note.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace NotesNet8.Models
{
    internal class Note
    {
        public string Filename { get; set; }
        public string Text { get; set; }
        public DateTime Date { get; set; }

        public Note()
        {
            Filename = $"{Path.GetRandomFileName()}.notes.txt";
            Date = DateTime.Now;
            Text = "";
        }

        public static Note Load(string filename)
        {
            filename = Path.Combine(FileSystem.AppDataDirectory, filename);
            if (!File.Exists(filename))
                throw new FileNotFoundException("Unable to find file on local storage.", filename);

            return new Note()
            {
                Filename = Path.GetFileName(filename),
                Text = File.ReadAllText(filename),
                Date = File.GetLastWriteTime(filename)
            };
        }

        public static IEnumerable<Note> LoadAll()
        {
            string appDataPath = FileSystem.AppDataDirectory;

            return Directory
                .EnumerateFiles(appDataPath, "*.notes.txt")
                .Select(filename => Note.Load(Path.GetFileName(filename)))
                .OrderByDescending(note => note.Date);
        }

        public void Save()
        {
            File.WriteAllText(Path.Combine(FileSystem.AppDataDirectory, Filename), Text);
        }

        public void Delete()
        {
            File.Delete(Path.Combine(FileSystem.AppDataDirectory, Filename));
        }
    }
}