DeviceCenter/model/Config.cs

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

namespace DeviceCenter.model
{
    class Config
    {
        private static readonly object _lock = new object();
        private static Config _Instance;
        public string url { get; set; }

        public string username { get; set; }

        public string password { get; set; }

        public string token { get; set; }

        public List<Device> devices { get; set; }

        public void save()
        {
            string path = AppDomain.CurrentDomain.BaseDirectory + "config.json";
            File.WriteAllText(path, JsonConvert.SerializeObject(this, Formatting.Indented));
        }

        public static Config getInstance()
        {
            if (null == _Instance)
            {
                lock (_lock)
                {
                    if (null == _Instance)
                    {

                        string path = AppDomain.CurrentDomain.BaseDirectory + "config.json";
                        if (File.Exists(path))
                        {
                            Config config = JsonConvert.DeserializeObject<Config>(File.ReadAllText(path));
                            _Instance = config;
                        }
                        else
                        {
                            Config config = new Config();
                            config.devices = new List<Device>();
                            config.username = "";
                            config.password = "";
                            config.save();
                            _Instance = config;
                        }
                    }
                }
            }
            return _Instance;
        }
    }
}