using Newtonsoft.Json;
 using System;
 using System.Collections.Generic;
 using System.IO;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;

 namespace ConfigHandler
 {
     public class ConfigHandler<T>
         where T : class
     {
         const string SAVE_PATH = "jsonconfig/";
         /// <summary>
         /// 单例模式
         /// </summary>
         static T config;
         private ConfigHandler()
         {

         }
         /// <summary>
         /// 获取保存地址，默认是泛型参数T的类型名称
         /// </summary>
         /// <returns></returns>
         private static string GetSavePath()
         {
             if (!Directory.Exists(SAVE_PATH))
             {
                 Directory.CreateDirectory(SAVE_PATH);
             }
             return $"{SAVE_PATH}{typeof(T).ToString()}.json";
         }
         /// <summary>
         /// 保存配置
         /// </summary>
         public static void Save(T _config)
         {
             config = _config;
             string json = JsonConvert.SerializeObject(_config);
             try
             {
                 using (var sw = new StreamWriter(GetSavePath()))
                 {
                     sw.WriteAsync(json);
                 }

             }
             catch (Exception)
             {
                 throw;
             }
         }
         /// <summary>
         /// 获取配置信息
         /// </summary>
         /// <returns></returns>
         public static T Load()
         {
             if (config == null)
             {
                 string json = "";
                 try
                 {
                     using (var sr = new StreamReader(GetSavePath()))
                     {
                         json = sr.ReadToEnd();
                         if (json != "")
                         {
                             config = JsonConvert.DeserializeObject<T>(json);
                         }
                         else
                         {
                             config = null;
                         }
                     }
                 }
                 catch (Exception)
                 {
                     config = null;
                 }
             }
             return config;
         }

     }

 }

using ConfigHandler;
using ConsoleApplication1;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            MyConfig config = new MyConfig();
            config = new MyConfig();
            config.name = "leiming";
            config.Age = ;
            config.Time = DateTime.Now;
            ConfigHandler<MyConfig>.Save(config);
            config = ConfigHandler<MyConfig>.Load();
            Console.WriteLine(config.ToString());
            Console.ReadKey();
        }
    }
    class MyConfig
    {
        public int Hello{get;set;}
        public string name { get; set; }
        public int Age { get; set; }
        public DateTime Time { get; set; }
        public override string ToString()
        {
            return $"Name={name},Age={Age},Time={Time.ToShortDateString()}";
        }
    }
}