SmartDoorLock_G1/Team.Utility/ServiceCollectionExtensions.cs

using System;
using System.IO;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Options;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;

namespace Team.Utility
{
    public class WritableOptions<T> : IWritableOptions<T> where T : class, new()
    {
        private readonly IOptionsMonitor<T> _options;
        private readonly string _section;
        private readonly string _file;

        public WritableOptions(IOptionsMonitor<T> options, string section, string file)
        {
            _options = options;
            _section = section;
            _file = file;
        }

        public T Value => _options.CurrentValue;
        public T Get(string name) => _options.Get(name);

        public void Update(Action<T> applyChanges)
        {
            var physicalPath =Path.Combine(AppDomain.CurrentDomain.BaseDirectory, _file);
            var jObject = JsonConvert.DeserializeObject<JObject>(File.ReadAllText(physicalPath));
            var sectionObject = jObject.TryGetValue(_section, out var section) ?
                JsonConvert.DeserializeObject<T>(section.ToString()) : Value ?? new T();
            applyChanges(sectionObject);
            jObject[_section] = JObject.Parse(JsonConvert.SerializeObject(sectionObject));
            File.WriteAllText(physicalPath, JsonConvert.SerializeObject(jObject, Formatting.Indented),System.Text.Encoding.UTF8);
        }
    }

    public static class ServiceCollectionExtensions
    {
        public static void ConfigureWritable<T>(
            this IServiceCollection services,
            IConfigurationSection section,
            string file = "appsettings.json") where T : class, new()
        {
            services.Configure<T>(section);
            services.AddSingleton<IWritableOptions<T>>(provider =>
            {
              
                var options = provider.GetService<IOptionsMonitor<T>>();
                return new WritableOptions<T>(options, section.Key, file); });
        }
    }
}