Creating Multilingual Websites - Part 2

using System;
using System.Collections;
using System.Globalization;
using System.IO;
using System.Web;
using System.Web.Caching;
using System.Xml;

namespace Localization{
   /// <summary>
   ///     ResourceManager class used to access localized content in XML files
   /// </summary>
	public sealed class ResourceManager{
      private ResourceManager(){}

      /// <summary>
      ///     Retrieves the RFC 1766 name of the current culture
      /// </summary>
      /// <remarks>
      ///     This would more likely belong in an utility/global class, but for simplicities sake, I've put it here
      /// </remarks>
      public static string CurrentCultureName {
         get { return System.Threading.Thread.CurrentThread.CurrentCulture.Name;}
      }

      /// <summary>
      ///     Wrapper to GetString() to get a colon
      /// </summary>
      public static string Colon {
         get { return GetString("colon"); }
      }
      /// <summary>
      ///     Returns 
      /// </summary>
      /// <param name="key" type="string">
      ///     <para>
      ///         The name of the resource we want
      ///     </para>
      /// </param>
      /// <remarks>
      ///   When in DEBUG mode, an ApplicationException will be thrown if the key isn't found
      /// </remarks>
      public static string GetString( string key) {
         Hashtable messages = GetResource();
         if (messages[key] == null){
            messages[key] = string.Empty;
#if DEBUG
            throw new ApplicationException("Resource value not found for key: " + key);
#endif
         }
         return (string)messages[key];
      }

      private static Hashtable GetResource() {
         string currentCulture = CurrentCultureName;
         string defaultCulture = LocalizationConfiguration.GetConfig().DefaultCultureName;
         string cacheKey = "Localization:" + defaultCulture + ':' + currentCulture;
         if (HttpRuntime.Cache[cacheKey] == null){
            Hashtable resource = new Hashtable();
            
            LoadResource(resource, defaultCulture, cacheKey);
            if (defaultCulture != currentCulture){
               try{
                  LoadResource(resource, currentCulture, cacheKey);
               } catch (FileNotFoundException){}
            }
         }
         return (Hashtable)HttpRuntime.Cache[cacheKey];
      }

      private static void LoadResource(Hashtable resource, string culture, string cacheKey) {
         string file = LocalizationConfiguration.GetConfig().LanguageFilePath + '\\' + culture + "\\Resource.xml";         
         XmlDocument xml = new XmlDocument();
         xml.Load(file);
         foreach (XmlNode n in xml.SelectSingleNode("Resource")) {
            if (n.NodeType != XmlNodeType.Comment){
               resource[n.Attributes["name"].Value] = n.InnerText;
            }
         }
         HttpRuntime.Cache.Insert(cacheKey, resource, new CacheDependency(file), DateTime.MaxValue, TimeSpan.Zero);
      }
      
	}
}