fix #185. Loading index cache on startup.

Wox.Infrastructure/Storage/BinaryStorage.cs

@@ -0,0 +1,45 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Runtime.Serialization.Formatters.Binary;
+using System.Text;
+
+namespace Wox.Infrastructure.Storage
+{
+    /// <summary>
+    /// Stroage object using binary data
+    /// Normally, it has better performance, but not readable
+    /// </summary>
+    [Serializable]
+    public abstract class BinaryStorage<T> : BaseStorage<T> where T : class, IStorage, new()
+    {
+        protected override string FileSuffix
+        {
+            get { return ".dat"; }
+        }
+
+        protected override void LoadInternal()
+        {
+            try
+            {
+                FileStream fileStream = new FileStream(ConfigPath, FileMode.Open, FileAccess.Read, FileShare.Read);
+                BinaryFormatter binaryFormatter = new BinaryFormatter();
+                serializedObject = binaryFormatter.Deserialize(fileStream) as T;
+                fileStream.Close();
+            }
+            catch (Exception)
+            {
+                serializedObject = LoadDefault();
+            }
+        }
+
+        protected override void SaveInternal()
+        {
+            FileStream fileStream = new FileStream(ConfigPath, FileMode.Create);
+            BinaryFormatter binaryFormatter = new BinaryFormatter();
+            binaryFormatter.Serialize(fileStream, serializedObject);
+            fileStream.Close();
+        }
+    }
+}