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currently active culture (the current culture of the active thread). Then it retrieves the resource dictionary for the determined culture with the GetResources method introduced earlier. This dictionary contains the value for the requested resource key. If no resource dictionary exists for the requested culture, it retrieves the dictionary for the neutral culture and retrieves the value for the requested resource from there. Finally, just one property is missing in your ResourceProvider implementation ResourceReader: IResourceReader IResourceProvider.ResourceReader { get { return new SimpleSqlResourceReader(GetResources(null)); } } All you need to do here is return an instance of IResourceReader in the getter method of the property based on the default resources. But returning an IResourceReader requires you to implement one as well. As you can see, implementing an IResourceReader is fairly easy: private sealed class SimpleSqlResourceReader : IResourceReader { private IDictionary _resources; internal SimpleSqlResourceReader(IDictionary dict) { _resources = dict; } void IResourceReader.Close() { // Nothing to do... } IDictionaryEnumerator IResourceReader.GetEnumerator() { return _resources.GetEnumerator(); } IEnumerator System.Collections.IEnumerable.GetEnumerator() { return _resources.GetEnumerator(); } void IDisposable.Dispose() { // Nothing to do... } } The resource reader just navigates through the available resources in a dictionary. Because you are already storing your resources in ListDictionary instances, which are IDictionary implementations, navigating through the contents is nothing more than returning an enumerator on the dictionary passed in. You can achieve that simply by calling the GetEnumerator() method of the dictionary as shown in the previous code snippet. Although this was the hard part of the work, you are not done yet. So far you have implemented a ResourceProvider class with all the necessary parts. But how will ASP.NET activate a ResourceProvider How will ASP.NET know about your ResourceProvider at all You can find the answer by taking a close look at the ResourceProviderFactory classes.

The Service implements OnCompletionListener so that it can be notified when the MediaPlayer has finished playing an audio file.

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A ResourceProviderFactory is responsible for creating instances of IResourceProvider implementations As such, the factory is the entry point into your custom ResourceProvider The factory is a simple class inherited from ResourceProviderFactory, which consists of two methods, as follows: public sealed class SimpleSqlResourceProviderFactory : ResourceProviderFactory { public override IResourceProvider CreateLocalResourceProvider( string virtualPath) { virtualPath = SystemIOPathGetFileName(virtualPath); return new SimpleSqlResourceProvider(virtualPath, ConfigurationManagerConnectionStrings["ResDB"]ConnectionString); } public override IResourceProvider CreateGlobalResourceProvider( string className) { // Not implemented in this example return null; } private sealed class SimpleSqlResourceProvider : IResourceProvider { // .. // Implementation of the IResourceProvider // See previous code snippets // .. } } A ResourceProviderFactory needs to implement two methods: one for creating the global resource provider and one for creating local resource providers Global resource providers are used for managing resources for all pages and parts of a web application The default implementation for global resources stores localized objects in .

resx files in the App_GlobalResources application folder Local resources are managed on a per-page basis For this example, you will implement local resources only (the concepts for implementing a global ResourceProvider are the same except that resources are not filtered by a virtual path but rather by a classKey that specifies the root name of a resource) The CreateLocalResourceProvider method is called by ASPNET when it starts localizing a page for the first time (instances of IResourceProvider classes are cached in the HttpApplication object) Therefore, all you have to do in this method implementation is create an instance of the previously created SimpleSqlResourceProvider class and return it Finally, you need to register the ResourceProviderFactory in the application s webconfig file as follows: <systemweb> <globalization resourceProviderFactoryType= "ApressLocalizationSimpleSqlResourceProviderFactory" /> </systemweb> Now ASP.

public class BackgroundAudioService extends Service implements OnCompletionListener {

NET instantiates your SimpleSqlResourceProviderFactory class when it launches the application for the first time (the factory is cached in the HttpApplication as well) Every time a page.

Summary

launches for the first time and needs to be localized, it calls into the factory for creating a local ResourceProvider for this page. The ResourceProvider is then used for retrieving the resources for all controls with a meta:resourceKey attribute associated them.

Caution Before you start testing your provider, you should continue with the implementation of the designtime support as shown in the next section ( Design Time and Custom ResourceProviders ). Without design-time support, you d need to enter the resources manually in your database; otherwise, your IResourceProvider would not work correctly because it would not find any resources.

We declare an object of type MediaPlayer. This object will handle the playback of the audio as shown in the custom audio player example in the last chapter.

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