GMap.NET.Core/GMap.NET.CacheProviders/PostgreSQLPureImageCache.cs

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namespace GMap.NET.CacheProviders
{
#if PostgreSQL
   using System;
   using System.Diagnostics;
   using System.IO;
   using Npgsql;
   using NpgsqlTypes;
   using GMap.NET.MapProviders;

   /// <summary>
   /// image cache for postgresql server
   /// </summary>
   public class PostgreSQLPureImageCache : PureImageCache, IDisposable
   {
      string connectionString = string.Empty;
      public string ConnectionString
      {
         get
         {
            return connectionString;
         }
         set
         {
            if(connectionString != value)
            {
               connectionString = value;

               if(Initialized)
               {
                  Dispose();
                  Initialize();
               }
            }
         }
      }

      NpgsqlCommand cmdInsert;
      NpgsqlCommand cmdFetch;
      NpgsqlConnection cnGet;
      NpgsqlConnection cnSet;

      bool initialized = false;

      /// <summary>
      /// is cache initialized
      /// </summary>
      public bool Initialized
      {
         get
         {
            lock(this)
            {
               return initialized;
            }
         }
         private set
         {
            lock(this)