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In this chapter, you delved deeper into data binding, one of the key pillars of WPF. In the past, many of the scenarios you considered in this chapter would be handled using code. In WPF, the data binding model (in conjunction with value converters, styles, and data templates) allows you to do much more work declaratively. In fact, data binding is nothing less than an all-purpose way to display any type of information, regardless of where it s stored, how you want to displayed, or whether it s editable. Sometimes, this data will be drawn from a back-end database. In other cases, it may come from a web service, a remote object, or the file system, or it may be generated entirely in code. Ultimately, it won t matter as long as the data model remains constant, your user interface code and binding expressions will remain the same.

At the time of this writing, there is a single Ruby on Rails based relying party, called Information Card Ruby. The home page is located at http://www.codeplex.com/informationcardruby/, as shown in Figure 13-4. The project is sponsored by Microsoft and ThoughtWorks and is published under the BSD license. The project website states that the project aims to provide a Rails plug-in and supporting library for integrating personal information cards to your Ruby on Rails relying party web application. In the identity metasystem, an application that requests and consumes digital identities about an individual is called a relying party. As we develop and learn from this project, Information Card Ruby will generate a developer guideline for integrating information cards to your Rails website, much in the spirit of accepting information cards to your ASP.NET site. You can find the latest code for the project on RubyForge at the following URL: http:// rubyforge.org/projects/informationcard/.

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Now that you ve explored the art of converting data, applying styles to the items in a list, and building data templates, you re ready to move on to data views, which work behind the scenes to coordinate collections of bound data. Using data views, you can add navigation logic and implement filtering, sorting, and grouping.

When you bind a collection (or a DataTable) to an ItemsControl, a data view is quietly created behind the scenes. This view sits between your data source and the bound control. The data view is a window into your data source. It tracks the current item, and it supports features such as sorting, filtering, and grouping. These features are independent of the data object itself, which means you can bind the same data in different ways in different portions of a window (or different parts of your application). For example, you could bind the same collection of products to two different lists but filter them to show different records. The view object that s used depends on the type of data object. All views derive from CollectionView, but two specialized implementations derive from CollectionView: ListCollectionView and BindingListCollectionView. Here s how it works: x x If your data source implements IBindingList, a BindingListCollectionView is created. This happens when you bind an ADO.NET DataTable. If your data source doesn t implement IBindingList but it implements IList, a ListCollectionView is created. This happens when you bind an ObservableCollection, like the list of products. If your data source doesn t implement IBindingList or IList but it implements IEnumerable, you get a basic CollectionView.

Tip Ideally, you ll avoid the third scenario. The CollectionView offers poor performance for large items and

C H A P T E R 1 3 RESOURCES FOR SUPPORTING INFORMATION CARDS IN PHP, JAVA, RUBY, AND PERL-BASED RELYING PARTIES

operations that modify the data source (such as insertions and deletions). As you learned in 19, if you re not binding to an ADO.NET data object, it s almost always easiest to use the ObservableCollection class.

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