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You can use the throw keyword on its own in a catch clause to rethrow the exception that caused the catch clause to be invoked. This is useful if you want to log the exception, but otherwise rely on the runtime to find another clause to handle the exception. Listing 14-15 demonstrates this technique. Listing 14-15. Rethrowing an Exception using System; class Listing 15 { static void Main(string[] args) { try { try { // throw an exception throw new NullReferenceException(); } catch (NullReferenceException ex) { Console.WriteLine("Inner try statement - Exception logged: {0}", ex.GetType()); throw; } } catch (NullReferenceException ex) { // handle the exception Console.WriteLine("Outer try statement - Exception handled: {0}", ex.GetType()); } // wait for input before exiting Console.WriteLine("Press enter to finish"); Console.ReadLine(); } }

int main() { Events^ events = gcnew Events(); // Add the event handlers for Start and Exit events->Start += gcnew EventHandler(events, &Events::OnStart); events->Exit += gcnew EventHandler(events, &Events::OnExit); f(events); // Remove the event handlers events->Start -= gcnew EventHandler(events, &Events::OnStart); events->Exit -= gcnew EventHandler(events, &Events::OnExit); } This code works because, as for a trivial property, methods are automatically generated by the compiler for adding and removing event handlers and raising events In addition, an underlying delegate is created You can certainly go far with events simply using trivial events, since often the add, remove, and raise methods are just what you need However, if your application requires special handling for adding or removing event handlers, or raising events, you can go beyond these default methods and define your own Listing 7-17 rewrites this to define custom add, remove, and raise methods.

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The unary operators set the sign of a numeric value. They are listed in Table 8-16. The unary positive operator simply returns the value of the operand. The unary negative operator returns the value of the operand subtracted from 0. Table 8-16. The Unary Operators

n the first three chapters, you looked at the basics of ASP.NET AJAX and how you can use it to build web applications that provide slick, clean, high-performing UIs by restricting the need for full-page postbacks to the server and that use the intelligence of the browser on the client side. You also learned about the ASP.NET AJAX JavaScript extensions that bring about a great deal of object-oriented support to JavaScript, thereby allowing you to create classes, events, interfaces, and even the ability to implement inheritance in JavaScript. These additions bring JavaScript one step closer to the .NET programming model with which you re already familiar. In this chapter, you ll learn a bit more about the JavaScript extensions and the built-in types as well as explore the main components of the ASP.NET AJAX client library.

In this case, we use the custom methods to track what s going on by writing to the console If you do write your own add and remove accessors, you should take care to ensure thread safety The default add and remove accessors lock on the containing object (the this pointer), meaning that any other thread attempting to access these methods on the same object will be locked out You can use the lock template provided in the msclr namespace (#include msclr\lockh to access it) to accomplish this Locking the add and remove accessors will prevent corruption of the list that keeps track of the functions to be called when an event is fired Locking the raise method is not a good idea since the code you call from your event handler might lead to an invocation of the event, which will lead to a deadlock Listing 7-17.

Metadata and Reflection The Type Class Getting a Type Object What Is an Attribute Applying an Attribute Predefined, Reserved Attributes More About Applying Attributes Custom Attributes Accessing an Attribute

static void Main(string[] args) { // create a datasource string[] fruits = new string[] {"apple", "plum", "cherry", "grape", "banana", "pear", "mango"}; // create a parallel foreach to process each item Parallel.ForEach<string>(fruits, dataItem => { Console.WriteLine("{0} has {1} characters", dataItem, dataItem.Length); }); // wait for input before exiting Console.WriteLine("Press enter to finish"); Console.ReadLine(); } } The static Parallel.ForEach<T> method creates a parallel foreach loop where each item that will be processed is of type T. In Listing 25-7, the data source is a string array, so I have used Parallel.ForEach<string>. The parameters for a basic parallel foreach loop are the data source and an Action or lambda expression that will be used to process each item, as illustrated by Figure 25-5.

Customizing add, remove, and raise // events_customcpp #include <msclr\lockh> using namespace System; using namespace msclr; ref class Events { public: // underlying delegates to use for the events EventHandler^ _start, ^ _exit;.

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