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Even though you re using an asynchronous binding, you ll still be forced to wait while your code queries the database. Once the product collection is created, the binding will query the Product.ModelNumber property of the current product object asynchronously. This behavior has little benefit, because the property procedures in the Product class take a trivial amount of time to execute. In fact, all well-designed data objects are built out of lightweight properties such as this, which is one reason that the WPF team had serious reservations about providing the Binding.IsAsync property at all! The only way to take advantage of Binding.IsAsync is to build a specialized class that includes timeconsuming logic in a property get procedure. For example, consider an analysis application that binds to a data model. This data object might include a piece of information that s calculated using a time-consuming algorithm. You could bind to this property using an asynchronous binding but bind to all the other properties with synchronous bindings. That way, some information will appear immediately in your application, and the additional information will appear once it s ready. WPF also includes a priority binding feature that builds on asynchronous bindings. Priority binding allows you to supply several asynchronous bindings in a prioritized list. The highest-priority binding is preferred, but if it s still being evaluated, a lower-priority binding is used instead. Here s an example:

I might be authorized to access a building from 8 am to 5 pm from Monday to Friday, but not at 10 pm or on Saturdays..

<TextBox> <TextBox.Text> <PriorityBinding> <Binding Path="SlowSpeedProperty" IsAsync="True" /> <Binding Path="MediumSpeedProperty" IsAsync="True" /> <Binding Path="FastSpeedProperty" /> </PriorityBinding> </TextBox.Text> </TextBox>

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This assumes that the current data context contains an object with three properties named SlowSpeedProperty, MediumSpeedProperty, and FastSpeedProperty. The bindings are placed in their order of importance. As a result, SlowSpeedProperty is always used to set the text, if it s available. But if the first binding is still in the midst of reading SlowSpeedProperty (in other words, there is time-consuming logic in the property get procedure), MediumSpeedProperty is used instead. If that s not available, FastSpeedProperty is used. For this approach to work, you must make all the binding asynchronous, except the fastest, lowest-priority binding at the end of the list. This binding can be asynchronous (in which case the text box will appear empty until the value is retrieved) or synchronous (in which case the window won t be frozen until the synchronous binding has finished its work).

The XmlDataProvider provides a quick and straightforward way to extract XML data from a separate file, web location, or application resource and make it available to the elements in your application The XmlDataProvider is designed to be read-only (in other words, it doesn t provide the ability to commit changes), and it isn t able to deal with XML data that may come from other sources (such as a database record, a web service message, and so on) As a result, it s a fairly specific tool If you ve used NET to work with XML in the past, you already know that NET provides a rich set of libraries for reading, writing, and manipulating XML.

Despite the best intentions, not everyone will use the same grammar to define their claims. In other cases, it might not be desirable or necessary to provide the claim itself; instead, it is something that is established by the claim. In these cases, you would require claims transformers. These would take claims as presented on an information card and transform them to a claim that is understood by the relying party. A date of birth is a fine example of this. In the United States, if you want to purchase a game for the Xbox 360 that is labeled Mature, you must be older than 17 years of age. Your date of birth is not particularly relevant; the company selling the game merely wants to comply with the law. Its only concern is a yes or no answer are you 17 or younger A claims transformer could examine the date of birth and transform it to a claim of 17 or younger. Claims transformers will also change claims from one format to another (that is, to/from SAML). This provides the ability to be extremely agile and provides an opportunity to add both backward- and forward-compatible support into identity systems. LDAP claims schemas, X.509, Kerberos, and SAML are all examples of different claim types that might be used and/or transformed.

You can use streamlined reader and writer classes that allow you to step through XML files and handle each element with custom code, you can use XPath or the DOM to hunt for specific bits of content, and you can use serializer classes to convert entire objects to and from an XML representation Each of these approaches has advantages and disadvantages, but all of them are more powerful than the XmlDataProvider If you foresee needing the ability to modify XML or to convert XML data into an object representation that you can work with in your code, you re better off using the extensive XML support that already exists in NET The fact that your data is stored in an XML representation then becomes a low-level detail that s irrelevant to the way you construct your user interface.

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