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In 19, you learned to build exactly this sort of form. Here s a quick review of the basic steps: 1. First you need to create the list of items, which you can show in an ItemsControl. Set the DisplayMemberPath to indicate the property (or field) you want to show for each item in the list. This list shows the model name of each item: <ListBox Name="lstProducts" DisplayMemberPath="ModelName"></ListBox> 2. To fill the list with data, set the ItemsSource property to your collection (or DataTable). Typically, you ll perform this step in code when your window loads or the user clicks a button. In this example, the ItemsControl is bound to an ObservableCollection of Product objects. ObservableCollection<Product> products = App.StoreDB.GetProducts(); lstProducts.ItemsSource = products; 3. To show item-specific information, add as many elements as you need, each with a binding expression that identifies the property or field you want to display. In this example, each item in the collection is a Product object. Here s an example that shows the model number of an item by binding to the Product.ModelNumber property: <TextBox Text="{Binding Path=ModelNumber}"></TextBox> 4. The easiest way to connect the item-specific elements to the currently selected item is to wrap them in a single container. Set the DataContext property of the container to refer to the selected item in the list: <Grid DataContext="{Binding ElementName=lstProducts, Path=SelectedItem}">

WPF s rendering engine is built upon DirectX, so it has the capability to display real-time 3D graphics. Silverlight, on the other hand, typically runs inside a web browser and can t make use of the client s 3D capabilities. If you wish to make extensive use of the more advanced 3D graphics available to WPF, such as pixel shaders, you will not be able to target Silverlight with the same application. At least, not without redesigning the interface you provide to your users.

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So far, this is all review. However, what you haven t yet considered is how to tailor the appearance of the data list and the data fields. For example, you don t yet know how to format numeric values, how to create a list that shows multiple pieces of information at once (and arranges these pieces in a pleasing way), and how to deal with nontext content, such as picture data. In this chapter, you ll cover all these tasks as you begin to build more respectable data forms.

In a basic binding, the information travels from the source to the target without any change. This seems logical, but it s not always the behavior you want. Often, your data source might use a low-level representation that you don t want to display directly in your user interface. For example, you might have numeric codes you want to replace with human-readable strings, numbers that need to be cut down to size, dates that need to be displayed in a long format, and so on. If so, you need a way to convert these values into the right display form. And if you re using a two-way binding, you also need to do the converse take user-supplied data and convert it to a representation suitable for storage in the appropriate data object. Fortunately, WPF has two tools that can help you: x

The .NET Framework 3.0 was delivered with Windows Vista and Office 2007, and Windows CardSpace was delivered as part of that. In addition, CardSpace is available as a free download for Windows XP SP2 and Windows Server 2003 SP1. The user-facing support for CardSpace on the client consists of two main components the identity selector and the simple self-issued identity provider.

String formatting. This feature allows you to convert data that s represented as text for example, strings that contain dates and numbers by setting the Binding.StringFormat property. It s a convenient technique that works for at least half of all formatting tasks. Value converters. This is a far more powerful (and somewhat more complicated) feature that lets you convert any type of source data into any type of object representation, which you can then pass on to the linked control.

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