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As written, this example has a giant limitation. When you create this window, the XAML parser creates the window and calls the GetProducts() method so it can set up the binding. Everything runs smoothly if the GetProducts() method returns the data you want, but the result isn t as nice if an unhandled exception is thrown (for example, if the database is too busy or isn t reachable). At this point, the exception bubbles up from the InitializeComponent() call in the window constructor. The code that s showing this window needs to catch this error, which is conceptually confusing. And there s no way to continue and show the window even if you catch the exception in the constructor, the rest of the window won t be initialized properly. Unfortunately, there s no easy way to solve this problem. The ObjectDataProvider class includes an IsInitialLoadEnabled property that you can set to false to prevent it from calling GetProducts() when the window is first created. If you set this, you can call Refresh() later to trigger the call. Unfortunately, if you use this technique, your binding expression will fail, because the list won t be able to retrieve its data source. (This is unlike most data binding errors, which fail silently without raising an exception.) So, what s the solution You can construct the ObjectDataProvider programmatically, although you ll lose the benefit of declarative binding, which is the reason you probably used the ObjectDataProvider in the first place. Another solution is to configure the ObjectDataProvider to perform its work asynchronously, as described in the next section. In this situation, exceptions cause a silent failure (although a trace message will still be displayed in the Debug window detailing the error).

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The INotifyPropertyChanged interface is part of an implementation of the Observer pattern for a specific purpose: to inform subscribers that the value of a property on the publisher has just changed. Without this interface, the subscribers would have to continually poll the properties of the publisher in order to determine that the value had changed. To implement the interface, you need to include a using System.ComponentModel statement at the top of your class s source file. The interface itself includes merely one single event that must be implemented, shown in Listing 4 5. Listing 4 5. The PropertyChanged Event event PropertyChangedEventHandler PropertyChanged The PropertyChangedEventHandler is a delegate that accepts a sender object and a PropertyChangedEventArgs instance. As with all interface members, this event must be public. The event s associated arguments class, as with all EventArgs derivations, is extremely simple, merely an immutable wrapper around the event s context in this case, the name of the property that has changed value (see Listing 4 6). Listing 4 6. The PropertyChangedEventArgs Constructor public PropertyChangedEventArgs( string propertyName )

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Most developers will find that there aren t many reasons for using the ObjectDataProvider. Usually, it s easier to simply bind directly to your data object and add the tiny bit of code that calls the class that queries the data (such as StoreDB). However, there is one reason that you might use the ObjectDataProvider to take advantage of its support for asynchronous data querying. <ObjectDataProvider IsAsynchronous="True" ... > It s deceptively simple. As long as you set the ObjectDataProvider.IsAsynchronous property to true, the ObjectDataProvider performs its work on a background thread. As a result, your interface isn t tied up while the work is underway. Once the data object has been constructed and returned from the method, the ObjectDataProvider makes it available to all bound elements.

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In the exit row scenario, this is an example of authorization based on age There are many examples of this type of authorization For example, if I attempt to purchase liquor or cigars in the state of Washington in the United States, the salespeople in each store I visit would request identification and validate I was at least 21 or 18 years of age, respectively As I mentioned earlier, I spent a good portion of the past year traveling As a result, many times I was not home when a shipping company attempted to deliver an order from an online store As a result, I needed to go to the company s facility to retrieve the package Now because I was picking up the package at the shipping company s facility, the company needed to guarantee that the package was being delivered to the right party.

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