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Asynchronous operations can throw exceptions. If the exception is the result of bad input, such as a null reference where an object is required, the Begin method will throw an exception. But it s possible that something failed while the operation was in progress perhaps we lost network connectivity partway through some work. In this case, the End method will throw an exception. The Asynchronous Programming Model is widely used in the .NET Framework class library, and while it is an efficient and flexible way to support asynchronous operations, it s slightly awkward to use in user interfaces. The completion callback typically happens on some random thread, so you can t update the UI in that callback. And the support for multiple simultaneous operations, possible because each operation is represented by a distinct IAsyncResult object, may be useful in server environments, but it s often just an unnecessary complication for client-side code. So there s an alternative pattern better suited to the UI.

The Team Build installation process is quite simple, but it is recommended that you document the process you use to set up your rst build agent so that the process can be repeated if you add additional build agents to your environment in the future.

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In my example, the host catches the ThreadAbortException, allowing the host to regain control of the thread and return it to the pool But there is a problem: What is to stop the untrusted code from catching the ThreadAbortException itself to keep control of the thread The answer is that the CLR treats the ThreadAbortException in a very special manner Even when code catches the ThreadAbortException, the CLR doesn t allow the exception to be swallowed In other words, at the end of the catch block, the CLR automatically rethrows the ThreadAbortException exception This CLR feature raises another question: If the CLR rethrows the ThreadAbortException at the end of a catch block, how can the host catch it to regain control of the thread Inside the host s catch block, there is a call to Thread s ResetAbort method .

Figure 7.12 shows the various view elements you see when you click the SplitViewController. As you can see, the SplitViewController is made up of two main views. The navigation bar in the left view should hint that its view is a navigation controller. The object viewer in the bottom corner confirms this. Notice that the view hierarchy is exactly the same as that for the navigation controller in section 7.2. The right view is loaded from another nib called DetailView. Double-clicking the blue text labeled DetailView opens it and allows you to modify it as you would any other view. You ll see that later in the section when you add a web view to the example application.

Understanding Print Servers Selecting Printers 287 287 286 Planning Printer Placement Installing Printers 288 295

The deleteItem method in the ItemManagerBean in listing 9.1 deletes an Item from the database. An important detail to notice about the deleteItem method

Calling this method tells the CLR to stop rethrowing the ThreadAbortException at the end of each catch block This raises yet another question: What s to stop the untrusted code from catching the ThreadAbortException and calling Thread s ResetAbort method itself to keep control of the thread The answer is that Thread s ResetAbort method requires the caller to have the SecurityPermission with the ControlThread flag set to true When the host creates the AppDomain for the untrusted code, the host will not grant this permission, and now, the untrusted code cannot keep control of the host s thread I should point out that there is still a potential hole in this story: While the thread is unwinding from its ThreadAbortException, the untrusted code can execute catch and finally blocks Inside these blocks, the untrusted code could enter an infinite loop, preventing the host from regaining control of its thread .

Solution to Exercise 13-1. Define an interface IConvertible that indicates that the class can convert a string to C# or VB. The interface should have two methods: ConvertToCSharp and ConvertToVB. Each method should take a string and return a string. In this exercise, you re not actually creating code that will run; you re just defining the interface. As you learned, the methods of the interface don t have any implementation, they just have signatures. Example A-34 shows this simple interface.

Listing 1-1 shows some of the code for the basic Web page that is created for you by Expression Blend for Silverlight projects.

masterColorList = [NSArray arrayWithObjects:colorList,otherColorList,nil];

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