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Notice how we don t have to update the event data parameter we can take advantage of polymorphism and just refer to it through its base type, unless we want to take advantage of its new features. In the lambda expression syntax, of course, the new type parameter is inferred and we don t have to change anything; we can just update the handler in ProductionDeptTool2 to cancel if it sees the text "document". If we compile and run, we now see the following output:

A function literal is constructed with the function keyword followed by an optional name and the list of arguments. Then comes the body of the function, enclosed in curly braces.

The process will not succeed. (Document 1) Tool1 has seen that processing is complete. Tool2 has seen that processing is complete. Tool1 has seen processing, and not canceled. Tool2 has seen processing, and not canceled. Document traduit. (Document 2) Spellchecked document. (Document 2) Repaginated document.

Constants members act like static values. They are visible to every instance of the class, and they are available even if there are no instances of the class. For example, the following code declares class X with constant field PI. Main does not create any instances of X, and yet it can use field PI and print its value. class X { public const double PI = 3.1416; } class Program { static void Main() { Console.WriteLine("pi = {0}", X.PI); } }

(Document 2) Highlighting 'millennium' (Document 2) Tool1 has seen that processing is complete. Tool2 has seen that processing is complete. Tool1 has seen processing, and not canceled. Tool2 has seen processing and canceled. Process canceled. (Document 3) Executed 6 processes.

So we have our cancellation behavior, but we have to be very careful. Notice that Tool1 happened to see the event first, and it happily executed its handler, before Tool2 got in and canceled the whole thing. When you write handlers for cancelable events, you must ensure that it doesn t matter if some or all of those handlers never get called and that they behave correctly if the action they expect never actually occurs. Cancelable events need very careful documentation to indicate how they relate to the actions around them, and the exact semantics of cancellation. It is therefore (in general) a bad idea to do what we have just done, and convert a noncancelable event into a cancelable one, if your code has already shipped; you stand a very good chance of breaking any clients that just recompile successfully against the new version.

Some classes (particularly those related to user interactions) need to expose a very large number of events. If you use the normal event syntax shown in the preceding examples, storage is allocated for every single event you declare, even if the events have no subscribers. This means that objects of this type can get very large, very quickly. To avoid this situation, C# provides you with the ability to manage storage for the events yourself, using syntax similar to a property getter and setter, with your own backing storage:

public event EventHandler MyEvent { add { // Code to add handler here } remove { // Code to remove handler here } }

This code produces the following output:

Typically, you use a Dictionary<Key,Val> to create the backing storage for the event only when it gets its first subscriber. (Dictionaries are described in 9.)

Example 5-32 updates the DocumentProcessor we re developing in this chapter to use a dictionary for the backing storage for its events.

class DocumentProcessor { private Dictionary<string, Delegate> events; public event EventHandler<ProcessCancelEventArgs> Processing { add { Delegate theDelegate = EnsureEvent("Processing"); events["Processing"] = ((EventHandler<ProcessCancelEventArgs>) theDelegate) + value; } remove { Delegate theDelegate = EnsureEvent("Processing"); events["Processing"] = ((EventHandler<ProcessCancelEventArgs>) theDelegate) - value; } } public event EventHandler<ProcessEventArgs> Processed { add { Delegate theDelegate = EnsureEvent("Processed"); events["Processed"] = ((EventHandler<ProcessEventArgs>) theDelegate) + value; } remove { Delegate theDelegate = EnsureEvent("Processed"); events["Processed"] = ((EventHandler<ProcessEventArgs>) theDelegate) - value; } } private Delegate EnsureEvent(string eventName) { // Construct the dictionary if it doesn't already // exist if (events == null) {

}

Components are complex objects capable of encapsulating other objects and child components. For example, a nonvisual component may need to encapsulate child objects and even instantiate them programmatically. A visual component, being associated with a DOM element, typically needs to attach and detach event handlers, or may create dynamic elements. Having a centralized location for initializing and disposing an instance is critical.

Unlike actual statics, however, constants do not have their own storage locations, and are substituted in by the compiler at compile time, in a manner similar to #define values in C and C++. This is shown in Figure 6-6, which illustrates the preceding code. Hence, although a constant member acts like a static, you cannot declare a constant as static. static const double PI = 3.14; Error: can t declare a constant as static

events = new Dictionary<string, Delegate>(); } // Add a placeholder for the delegate if we don't // have it already Delegate theDelegate = null; if (!events.TryGetValue( eventName, out theDelegate)) { events.Add(eventName, null); } return theDelegate;

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