GazpromApp/Utils/DataSerialization.cs

using System;
using System.IO;
using System.Text.Json;
using GazpromApp.Models;

namespace GazpromApp.Utils;

public static class DataSerialization
{
    private static void SaveData(string path, string data)
    {
        if (!File.Exists(path))
        {
            File.WriteAllText(path, data);
            return;
        }

        var dir = Path.GetDirectoryName(path) ?? "";
        var fileName = Path.GetFileNameWithoutExtension(path);
        var ext = Path.GetExtension(path);
        var index = 1;
    
        while (File.Exists(Path.Combine(dir, $"{fileName} ({index}){ext}")))
            index++;
        
        File.WriteAllText(Path.Combine(dir, $"{fileName} ({index}){ext}"), data);
    }

    private static string LoadData(string path)
    {
        var text = File.ReadAllText(path);
        return text;
    }

    public static void SavePoint(Point point, string path)
    {
        SaveData(path, point.Serialize());
    }
    
    public static Point? LoadPoint(string path)
    {
        return Deserialization.Deserialize(LoadData(path));
    }
}

public static class Serialization
{
    public static string Serialize(this Point point)
    {
        return JsonSerializer.Serialize(point);
    }
}

public static class Deserialization
{
    public static Point? Deserialize(string point)
    {
        try
        {
            return !string.IsNullOrEmpty(point) ? JsonSerializer.Deserialize<Point>(point) : null;
        }
        catch
        {
            throw new ArgumentException("Ошибка расшифровки json файла");
        }
    }
}