Local Cached Properties Service

PropertiesService.cs

using System;
using System.Collections.Generic;
using System.IO;
using System.Reflection;
using Newtonsoft.Json;

namespace savaged.Services.IO
{
    class PropertiesService : IPropertiesService
    {
        private IDictionary<string, object> _props;
        private bool _isInitialised;

        public PropertiesService()
        {
            _props = new Dictionary<string, object>();
            FileLocation = Path.Combine(
                Environment.GetFolderPath(
                    Environment.SpecialFolder.LocalApplicationData),
                Assembly.GetEntryAssembly().GetName().Name,
                "props.json");
        }

        public void Initialise(string fileLocation = "")
        {
            if (_isInitialised) return;

            if (!string.IsNullOrEmpty(fileLocation))
            {
                FileLocation = fileLocation;
            }
            var fileInfo = new FileInfo(FileLocation);
            if (fileInfo.Exists)
            {
                _props = JsonConvert
                    .DeserializeObject<IDictionary<string, object>>(
                        File.ReadAllText(FileLocation));
            }
            else 
            {
                if (!fileInfo.Directory.Exists)
                {
                    fileInfo.Directory.Create();
                }
                File.WriteAllText(
                    FileLocation, 
                    JsonConvert.SerializeObject(_props));
            }
            _isInitialised = true;
        }

        public string FileLocation { get; private set; }

        public object Get(string key)
        {
            Initialise();

            if (_props.Keys.Contains(key))
            {
                return _props[key];
            }
            return null;
        }

        public void Set(string key, object value)
        {
            Initialise();

            if (_props.Keys.Contains(key))
            {
                _props[key] = value;
            }
            else
            {
                _props.Add(key, value);
            }
            var fileInfo = new FileInfo(FileLocation);
            if (fileInfo.Exists)
            {
                File.Delete(FileLocation);
            }
            var json = JsonConvert.SerializeObject(_props);

            File.WriteAllText(FileLocation, json);
        }
        
    }
}