简易JsonConfig类

Demo

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

namespace ConsoleApp1
{
    internal class Program
    {
        static void Main(string[] args)
        {
            var cfg = Config.Load<MyClass>();
            Console.WriteLine(cfg.Text);
            cfg.Number++;
            Console.WriteLine(cfg.Number);
            cfg.Save();
            Console.ReadKey();
        }

        class MyClass : Config
        {
            public string Text { get; set; } = "Empty";
            public int Number { get; set; } = 0;
        }
    }

    public class Config
    {
        const string DefaultFile = "Config.json";

        public void Save(string file = DefaultFile)
        {
            File.WriteAllText(file, JsonSerializer.Serialize(this, GetType()));
        }

        public static T Load<T>(string file = DefaultFile)
        {
            if (File.Exists(file))
                return JsonSerializer.Deserialize<T>(File.ReadAllText(file));
            else
                return Activator.CreateInstance<T>();
        }
    }
}