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If you have a claim-based identity, the next question is, How does a relying party negotiate to retrieve the information in which it is interested Relying parties specify the claims they are interested in and whether those claims are required or optional. They also specify the specific type of tokens (X.509, Kerberos, and so on) that they are willing to accept. Negotiations are conducted using WS-MetadataExchange and WS-SecurityPolicy.

Note Item-level validation works more seamlessly with the DataGrid control you ll explore in 22. It

handles the transactional aspects of editing, triggering field navigation when the user moves from one cell to another and calling BindingGroup.CommitEdit() when the user moves from one row to another.

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In most of the examples you ve seen, the top-level data source has been supplied by programmatically setting the DataContext of an element or the ItemsSource property of a list control In general, this is the most flexible approach, particularly if your data object is constructed by another class (such as StoreDB) However, you have other options One technique is to define your data object as a resource in your window (or some other container) This works well if you can construct your object declaratively, but it makes less sense if you need to connect to an outside data store (such as a database) at runtime However, some developers still use this approach (often in a bid to avoid writing event handling code) The basic idea is to create a wrapper object that fetches the data you need in its constructor.

Because the metasystem is a system of systems, it does not look to compete with or replace existing systems. Rather than a rip-and-replace mentality, the focus of the metasystem is on interoperability. Because a number of different identity solutions and stores are already in place today, this makes it much more realistic for the metasystem to be successful. Rather than discourage innovation, which tends to happen in a closed system, the focus on interoperability actually fosters innovation.

For example, you could create a resource section like this: <WindowResources> <ProductListSource x:Key="products"></ProductListSource> </WindowResources> Here, ProductListSource is a class that derives from ObservableCollection<Products> Thus, it has the ability to store a list of products It also has some basic logic in the constructor that calls StoreDBGetProducts() to fill itself Now, other elements can use this in their binding: <ListBox ItemsSource="{StaticResource products}" .. > This approach seems tempting at first, but it s a bit risky When you add error handling, you ll need to place it in the ProductListSource class You may even need to show a message explaining the problem to the user As you can see, this approach mingles the data model, the data access code, and the user interface code in a single muddle, so it doesn t make much sense when you need to access outside resources (files, databases, and so on).

Define a one-to-many dependency between objects so that when one object changes state, all its dependents are notified and updated automatically. Design Patterns: Elements of Reusable Object-Oriented Software [GoF, p293]

Data providers are, in some ways, an extension of this model A data provider gives you the ability to bind directly to an object that you define in the resources section of your markup However, instead of binding directly to the data object itself, you bind to a data provider that s able to retrieve or construct that object This approach makes sense if the data provider is full-featured for example, if it has the ability to raise events when exceptions occur and provides properties that allow you to configure other details about its operation Unfortunately, the data providers that are included in WPF aren t yet up to this standard They re too limited to be worth the trouble in a situation with external data (for example, when fetching the information from a database or a file).

They may make sense in simpler scenarios for example, you could use a data provider to glue together some controls that supply input to a class that.

calculates a result. However, they add relatively little in this situation except the ability to reduce event handling code in favor of markup. All data providers derive from the System.Windows.Data.DataSourceProvider class. Currently, WPF provides just two data providers: x x

Security Token Server (STS)

ObjectDataProvider, which gets information by calling a method in another class XmlDataProvider, which gets information directly from an XML file

The goal of both of these objects is to allow you to instantiate your data object in XAML, without resorting to event handling code.

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