code refactoring and add web searches setting window.

WinAlfred/Helper/CommonStorage.cs

@@ -0,0 +1,85 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Runtime.Serialization.Formatters.Binary;
+using System.Text;
+using System.Threading;
+using Newtonsoft.Json;
+using WinAlfred.Models;
+
+namespace WinAlfred.Helper
+{
+    [Serializable]
+    public class CommonStorage
+    {
+        private static string configPath = Directory.GetCurrentDirectory() + "\\data.json";
+        private static object locker = new object();
+        private static CommonStorage storage;
+
+        public UserSetting UserSetting { get; set; }
+        public UserSelectedRecords UserSelectedRecords { get; set; }
+
+        private CommonStorage()
+        {
+            //default setting
+            UserSetting = new UserSetting
+            {
+                Theme = "Default",
+                ReplaceWinR = true,
+                WebSearches = new List<WebSearch>()
+            };
+
+            UserSelectedRecords = new UserSelectedRecords();
+        }
+
+        public void Save()
+        {
+            lock (locker)
+            {
+                //json is a good choise, readable and flexiable
+                string json = JsonConvert.SerializeObject(storage, Formatting.Indented);
+                File.WriteAllText(configPath, json);
+            }
+        }
+
+        private static void Load()
+        {
+            if (!File.Exists(configPath))
+            {
+                File.Create(configPath).Close();
+            }
+            string json = File.ReadAllText(configPath);
+            if (!string.IsNullOrEmpty(json))
+            {
+                try
+                {
+                    storage = JsonConvert.DeserializeObject<CommonStorage>(json);
+                }
+                catch (Exception e)
+                {
+                    //on-op, keep default storage
+                }
+            }
+        }
+
+        public static CommonStorage Instance
+        {
+            get
+            {
+                if (storage == null)
+                {
+                    lock (locker)
+                    {
+                        if (storage == null)
+                        {
+                            storage = new CommonStorage();
+                            Load();
+                        }
+                    }
+                }
+                return storage;
+            }
+        }
+    }
+}