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As this example demonstrates, two-way bindings give you remarkable flexibility. You can use them to apply changes from the source to the target and from the target to the source. You can also apply them in combination to create a surprisingly complex code-free window. Usually, the decision of where to place a binding expression is driven by the logic of your coding model. In the previous example, it probably makes more sense to place the binding in the TextBox.Text property rather than the Slider.Value property, because the text box is an optional add-on to an otherwise complete example, not a core ingredient that the slider relies on. It also makes more sense to bind the text box directly to the TextBlock.FontSize property rather than the Slider.Value property. (Conceptually, you re interested in reporting the current font size, and the slider is just one of the ways this font size can be set. Even though the slider position is the same as the font size, it s an unnecessary extra detail if you re trying to write the cleanest possible markup.) Of course, these decisions are subjective and a matter of coding style. The most important lesson is that all three approaches can give you the same behavior.

Summary

In the current example, these changes don t add anything new. This approach simplifies the markup and makes it easier to reuse your templates, but it doesn t affect the way your data is displayed. However, if you have deeply nested trees that have looser structures, this design is invaluable. For example, imagine you re creating a tree of Manager objects, and each Manager object has an Employees collection. This collection might contain ordinary Employee objects or other Manager objects, which would in turn contain more Employees. If you use the type-based template system shown earlier, each object automatically gets the template that s right for its data type.

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public event PropertyChangedEventHandler PropertyChanged; private Timer _timer; } } For brevity, the corresponding XAML is omitted. All it does is bind a Label s Content DependencyProperty to the Message property of the ViewModel. When a System.Timers.Timer elapses, the registered event fires on a new worker thread. The reason why the Message assignment works is because the framework internally detects whether the correct thread is being executed in order to update the UI. If it is not, it executes the code on the correct thread and neither the user nor the developers need to know about it. However, this does not always work, and there may be common situations where the marshalling needs to be done manually. Listing 4 25. The Framework Cannot Always Auto-Marshal using System.Timers; namespace DispatcherFailure { public class ViewModel { public ViewModel() { Messages = new ObservableCollection<string>(); _timer = new Timer(5000D); _timer.Elapsed += new ElapsedEventHandler(TimerElapsed); _timer.Enabled = true; _timer.Start(); } public ObservableCollection<string> Messages { get; private set; } void TimerElapsed(object sender, ElapsedEventArgs e) { Messages.Add("Timer fired!"); } private Timer _timer; } } In the example in Listing 4 25, the Messages property is bound to a ListView in the XAML. When a new Message string is added to the ObservableCollection, the framework throws a NotSupportedException because the wrong thread is executing. It does not marshal to the correct thread automatically. Thankfully, the marshalling is relatively simple, but organizing which layer should be responsible for marshalling requires some explanation.

You can also use a TreeView to show a multilayered DataSet one that has relationships linking one DataTable to another. For example, here s a code routine that creates a DataSet, fills it with a table of products and a separate table of categories, and links the two tables together with a DataRelation object: public DataSet GetCategoriesAndProductsDataSet() { 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"); cmd.CommandText = "GetCategories"; adapter.Fill(ds, "Categories"); // Set up a relation between these tables. DataRelation relCategoryProduct = new DataRelation("CategoryProduct", ds.Tables["Categories"].Columns["CategoryID"], ds.Tables["Products"].Columns["CategoryID"]); ds.Relations.Add(relCategoryProduct); return ds; } To use this in a TreeView, you begin by binding to the DataTable you want to use for the first level: DataSet ds = App.StoreDB.GetCategoriesAndProductsDataSet(); treeCategories.ItemsSource = ds.Tables["Categories"].DefaultView; But how do you get the related rows After all, you can t call a method like GetChildRows() from XAML. Fortunately, the WPF data binding system has built-in support for this scenario. The trick is to use the name of your DataRelation as the ItemsSource for your second level. In this example, the DataRelation was created with the name CategoryProduct, so this markup does the trick: <TreeView Name="treeCategories" Margin="5"> <TreeView.ItemTemplate> { <HierarchicalDataTemplate ItemsSource="{Binding CategoryProduct}"> <TextBlock Text="{Binding CategoryName}" Padding="2" /> <HierarchicalDataTemplate.ItemTemplate>

<DataTemplate> <TextBlock Text="{Binding ModelName}" Padding="2" /> </DataTemplate> </HierarchicalDataTemplate.ItemTemplate> </HierarchicalDataTemplate> </TreeView.ItemTemplate> </TreeView> Now this example works in the same way as the previous example, which used custom Product and Category objects.

As you saw in this chapter, many parties more to the point, many of the right parties believe in and are investing in user-centric identity and the identity metasystem. In this chapter, you saw the projects and products that individuals outside of Microsoft are working on regarding identity selectors, token generators, and STSs. You also saw approaches beyond information cards such as LID, OpenID, and XRI. As we move forward, these systems are beginning to interoperate with each other.

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