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Of course, to complete this example, from an application perspective you ll need to supply some code. For example, you might need an UpdateProducts() method that accepts your collection or products and executes the appropriate statements. Because an ordinary .NET object doesn t provide any change tracking, this is a situation where you might want to consider using the ADO.NET DataSet (as described a little later in this chapter). Alternatively, you might want to force users to update records one at a time. (One option is to disable the list when text is modified in a text box and force the user to then cancel the change by clicking Cancel or apply it immediately by clicking Update.)

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One limitation of the previous example is that it won t pick up changes you make to the collection. It notices changed Product objects, but it won t update the list if you add a new item or remove one through code. For example, imagine you add a Delete button that executes this code: private void cmdDeleteProduct_Click(object sender, RoutedEventArgs e) { products.Remove((Product)lstProducts.SelectedItem); } The deleted item is removed from the collection, but it remains stubbornly visible in the bound list. To enable collection change tracking, you need to use a collection that implements the INotifyCollectionChanged interface. Most generic collections don t, including the List collection used in the current example. In fact, WPF includes a single collection that uses INotifyCollectionChanged: the ObservableCollection class.

In addition to the xmldap.org relying party reviewed earlier in the chapter, other implementations are available.

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Note If you have an object model that you re porting over from the Windows Forms world, you can use the

DependencyProperties automatically enable a number of services that are not available to plain properties. They are created very differently from plain properties and must be hosted inside a DependencyObject (see Listing 2 1). Listing 2 1. How to Register a DependencyProperty public class MyDependencyObject : DependencyObject { public static MyDependencyObject() { MyDependencyProperty = DependencyProperty.Register("MyProperty", typeof(string),

Windows Forms equivalent of ObservableCollection, which is BindingList. The BindingList collection implements IBindingList instead of INotifyCollectionChanged, which includes a ListChanged event that plays the same role as the INotifyCollectionChanged.CollectionChanged event.

You can derive a custom collection from ObservableCollection to customize the way it works, but that s not necessary. In the current example, it s enough to replace the List<Product> object with an ObservableCollection<Product>, as shown here: public List<Product> GetProducts() { SqlConnection con = new SqlConnection(connectionString); SqlCommand cmd = new SqlCommand("GetProducts", con); cmd.CommandType = CommandType.StoredProcedure; ObservableCollection<Product> products = new ObservableCollection<Product>(); ...

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The return type can be left as List<Product>, because the ObservableCollection class derives from the List class. To make this example just a bit more generic, you could use ICollection<Product> for the return type, because the ICollection interface has all the members you need to use. Now, if you remove or add an item programmatically, the list is refreshed accordingly. Of course, it s still up to you to create the data access code that takes place before the collection is modified for example, the code that removes the product record from the back-end database.

One of the Java implementations is the JInformationCard project. You can find the main website for the project at http://informationcard.sourceforge.net. The project was developed by the Fraunhofer Institute FOKUS in Germany and is published under the BSD license. According to that site, the purpose of the project is to demonstrate information card interoperability on heterogeneous platforms written using Java language to support Apache Tomcat, Sun Java web servers, and WebSphere Application Server platforms running on Linux or Windows. The project provides a sample relying party application called Bio Mini Shop, which you can find at https://zeno.fokus.fraunhofer.de/BioMiniShop/home.jsp. Figure 13-3 shows the login page for that test site.

All the features you ve learned about with custom objects also work with the ADO.NET disconnected data objects. For example, you could create the same user interface you see in Figure 19-4 but use the DataSet, DataTable, and DataRow on the back end, rather than the custom Product class and the ObservableCollection. To try it, start by considering a version of the GetProducts() method that extracts the same data but packages it into a DataTable: public DataTable GetProducts() { SqlConnection con = new SqlConnection(connectionString); SqlCommand cmd = new SqlCommand("GetProducts", con); cmd.CommandType = CommandType.StoredProcedure; SqlDataAdapter adapter = new SqlDataAdapter(cmd); DataSet ds = new DataSet(); adapter.Fill(ds, "Products"); return ds.Tables[0]; } You can retrieve this DataTable and bind it to the list in almost the same way you did with the ObservableCollection. The only difference is that you can t bind directly to the DataTable itself. Instead, you need to go through an intermediary known as the DataView. Although you can create a DataView by hand, every DataTable has a ready-made DataView object available through the DataTable.DefaultView property.

Note This limitation is nothing new. Even in a Windows Forms application, all DataTable data binding goes

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