By John Papa
This entire e-book teaches you ways to construct data-rich company functions with Silverlight 2 that draw on a number of resources of information. filled with reusable examples, Data-Driven prone with Silverlight 2 covers all the facts entry and internet carrier instruments you would like, together with info binding, the LINQ facts querying part, RESTful and cleaning soap net provider aid, cross-domain internet carrier calls, and Microsofts new ADO.NET facts prone and the ADO.NET Entity Framework.With this publication, you will:Know whilst and the way to exploit LINQ to JSON, LINQ to XML, and LINQ to ObjectsLearn how Silverlight 2 purposes bind, cross, learn, store, question, and current dataDiscover how your software can name internet prone to paintings with cleaning soap, relaxation, RSS, AtomPub, POX and JSONDesign leisure, ASMX, and WCF net prone that converse with Silverlight 2Harness RESTful net prone reminiscent of Digg, Amazon, and TwitterRetrieve and store info utilizing the recent Entity Framework and WCFWork with RESTful ADO.NET facts providers and its Silverlight customer library to maneuver facts among your Silverlight software and a databaseData-Driven providers with Silverlight 2 bargains many suggestions and tips for construction data-rich enterprise functions, and covers the eventualities youre probably to come across. whole examples in C# and VB could be downloaded from the books better half site.
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Extra info for Data-Driven Services with Silverlight 2
OneWay binding sends the source values to the target when the source is set, but it also listens for any changes in the source object and sends those on to the target as well. If the source object implements the INotifyPropertyChanged interface and its property setters raise the PropertyChanged event, the target of the binding will listen for this event and will receive the updated value. Table 3-1 and Figure 3-2 reiterate this concept, showing that changes are sent from the source to the target either when the source is set or the source is changed.
OneTime binding simply pushes values from the source to the target on binding. OneWay has all of OneTime's features, plus it updates the target when the source changes, provided that the INotifyPropertyChanged interface is implemented and its PropertyChanged event is raised. The TwoWay binding mode has the other modes' features, plus it allows the target to update the source. Here are some good rules of thumb to determine when it is best to use each binding mode. OneTime binding is a great choice for read-only information and when the target needs to be updated when it is first bound to the source, creating a snapshot of the source in the target that will not change as the source changes.
1. Rule 1: FrameworkElement The target of the data binding must be a FrameworkElement. This may sound limiting, but it is quite the opposite. Many subclasses inherit from FrameworkElement. Figure 2-3 shows several controls that inherit from FrameworkElement. FrameworkElement extends the UIElement class and adds capabilities that allow it to control layout and support data binding. Figure 2-3. FrameworkElement class hierarchy 34 35 Any XAML element that derives from FrameworkElement can be used for layout on a page or user control, and can be involved in data binding as a target.
Data-Driven Services with Silverlight 2 by John Papa