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Figure 3-1. CardSpace identity selector identifies which data is being requested This covers the minimal disclosure reflected in the law, but what about for a constrained use The following is a real story of something that happened to me; I ve changed the name of the bank because it s not relevant. When I moved to Redmond, Washington, I decided to buy a house. I consulted with two large financial institutions about a mortgage; let s call them Bank A and Bank B. During the process of applying for my mortgage, each bank was provided with a mortgage application form. This application contained information by which the bank could check my credit history and determine my credit worthiness. Now, if there were a white paper called Prerequisites for Easy Identity Theft, the data collected for the mortgage application would comprise the majority of that paper. The information contained my name, address, date of birth, Social Security number, place of employment, and so on. The information was provided to the bank solely to determine my credit worthiness. The use of this information should have been used for the determination of credit worthiness and for perhaps moving forward to populate parts of my account information with the bank I eventually chose. In the end, Bank A had a lower rate, and I took a mortgage through them. At this point, my relationship with Bank B was complete. One would assume that the right for Bank B to store my data had been withdrawn. I had not provided my data for the bank to use in

storing it as a member variable in your window class, which simplifies your code and requires less type casting.

When you run this code, you ll find that even though the Product object has been changed, the old value remains in the text box. That s because the text box has no way of knowing that you ve changed a value.

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You can use three approaches to solve this problem: x You can make each property in the Product class a dependency property using the syntax you learned about in 4. (In this case, your class must derive from DependencyObject.) Although this approach gets WPF to do the work for you (which is nice), it makes the most sense in elements classes that have a visual appearance in a window. It s not the most natural approach for data classes like Product. You can raise an event for each property. In this case, the event must have the name PropertyNameChanged (for example, UnitCostChanged). It s up to you to fire the event when the property is changed. You can implement the System.ComponentModel.INotifyPropertyChanged interface, which requires a single event named PropertyChanged. You must then raise the PropertyChanged event whenever a property changes and indicate which property has changed by supplying the property name as a string. It s still up to you to raise this event when a property changes, but you don t need to define a separate event for each property.

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The first approach relies on the WPF dependency property infrastructure, while both the second and the third rely on events. Usually, when creating a data object, you ll use the third approach. It s the simplest choice for non-element classes.

In 3, we looked at the reasons for splitting model and view responsibilities and implementing a ViewModel to mediate between these layers. Now we ll focus more closely on the responsibilities of the ViewModel, which is, arguably, the most important component of the MVVM pattern, as well as the least familiar. We will look at the overall structure of an application built around MVVM, including a deeper explanation of how each layer operates. Concentrating more fully on the ViewModel, we will examine its lifecycle from construction to destruction. We will also see that the .NET Framework provides a number of interfaces and classes that can help us produce a rounded ViewModel with enduring utility. Finally, we ll look at effectively wrapping the model while offering the correct services to the view.

Note You can actually use one other approach. If you suspect a change has been made to a bound object

and that bound object doesn t support change notifications in any of the proper ways, you can retrieve the BindingExpression object (using the FrameworkElement.GetBindingExpression() method) and call BindingExpression.UpdateTarget() to trigger a refresh. Obviously, this is the most awkward solution you can almost see the duct tape that s holding it together.

Here s the definition for a revamped Product class that uses the INotifyPropertyChanged interface, with the code for the implementation of the PropertyChanged event: public class Product : INotifyPropertyChanged { public event PropertyChangedEventHandler PropertyChanged; public void OnPropertyChanged(PropertyChangedEventArgs e) { if (PropertyChanged != null) PropertyChanged(this, e); } }

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