GMap.NET.Core/GMap.NET.CacheProviders/SQLitePureImageCache.cs

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namespace GMap.NET.CacheProviders
{
#if SQLite

   using System.Collections.Generic;
   using System.Data.Common;
   using System.IO;
   using System.Text;
   using System;
   using System.Diagnostics;
   using System.Globalization;
   using GMap.NET.MapProviders;
   using System.Threading;

#if !MONO
   using System.Data.SQLite;
#else
   using SQLiteConnection=Mono.Data.SqliteClient.SqliteConnection;
   using SQLiteTransaction=Mono.Data.SqliteClient.SqliteTransaction;
   using SQLiteCommand=Mono.Data.SqliteClient.SqliteCommand;
   using SQLiteDataReader=Mono.Data.SqliteClient.SqliteDataReader;
   using SQLiteParameter=Mono.Data.SqliteClient.SqliteParameter;
#endif

   /// <summary>
   /// ultra fast cache system for tiles
   /// </summary>
   internal class SQLitePureImageCache : PureImageCache
   {
#if !PocketPC
#if !MONO
      static SQLitePureImageCache()
      {
         AppDomain.CurrentDomain.AssemblyResolve += new ResolveEventHandler(CurrentDomain_AssemblyResolve);
      }

      static System.Reflection.Assembly CurrentDomain_AssemblyResolve(object sender, ResolveEventArgs args)
      {
         if(args.Name.StartsWith("System.Data.SQLite", StringComparison.OrdinalIgnoreCase))
         {
            string rootDir = System.Environment.GetFolderPath(System.Environment.SpecialFolder.LocalApplicationData) + Path.DirectorySeparatorChar + "GMap.NET" + Path.DirectorySeparatorChar;
            string dllDir = rootDir + "DllCache" + Path.DirectorySeparatorChar;
            string dll = dllDir + "SQLite_v77_NET" + Environment.Version.Major + "_" + (IntPtr.Size == 8 ? "x64" : "x86") + Path.DirectorySeparatorChar + "System.Data.SQLite.DLL";
            if(!File.Exists(dll))
            {
               string dir = Path.GetDirectoryName(dll);
               if(!Directory.Exists(dir))
               {
                  Directory.CreateDirectory(dir);
               }

               Debug.WriteLine("Saving to DllCache: " + dll);

               if(Environment.Version.Major == 2)
               {
                  using(MemoryStream gzipDll = new MemoryStream((IntPtr.Size == 8 ? Properties.Resources.System_Data_SQLite_x64_NET2_dll : Properties.Resources.System_Data_SQLite_x86_NET2_dll)))
                  {
                     using(var gs = new System.IO.Compression.GZipStream(gzipDll, System.IO.Compression.CompressionMode.Decompress))
                     {
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