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within the scope of the type it naturally works with. On a related note, given that the compiler transforms a delegate into a full class definition, what we have actually done is create two nested classes. Next, note that we declare two member variables (one for each delegate type) and two helper functions (OnAboutToBlow() and OnExploded()) that allow the client to add a method to the delegates invocation list. In concept, these methods are similar to the Advise() and Unadvise() method we created during the EventInterface example. Of course, in this case, the incoming parameter is a client-allocated delegate object rather than a class implementing a specific interface. At this point, we need to update the Accelerate() method to invoke each delegate, rather than iterate over an ArrayList of client-side sinks (as we did in the EventInterface example). Here is the update: public void Accelerate(int delta) { // If the car is dead, fire Exploded event. if (carIsDead) { if (explodedList != null) explodedList("Sorry, this car is dead..."); } else { currSpeed += delta; // Almost dead if (10 == maxSpeed - currSpeed && almostDeadList != null) { almostDeadList("Careful buddy! }

Summary

Gonna blow!");

Now let s add that wrapper method and let our class decide how to handle the data retrieval Add a public function to the cXML class and name it GetXMLData Add the following code: Public Function GetXMLData(Optional DoOverwrite As Boolean = True) If (m_sMapName = "") Or (Not MeHasMaps) Then GetNewXMLData Else 'must set XMLSourceFile Property before appending if necessary GetXMLForExistingMap DoOverwrite End If End Function The GetXMLData method has one optional argument, which is used to set an overwrite flag for the incoming data This argument has a default value of True, remaining consistent with Excel s built-in object interfaces..

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// Still OK! if (currSpeed >= maxSpeed) carIsDead = true; else Console.WriteLine("->CurrSpeed = {0}", currSpeed); } } Notice that before we invoke the methods maintained by the almostDeadList and explodedList member variables, we are checking them against a null value. The reason is that it will be the job of the caller to allocate these objects by calling the OnAboutToBlow() and OnExploded() helper methods. If the caller does not call these methods, and we attempt to invoke the delegate s invocation list, we will trigger a NullReferenceException and bomb at runtime (which would obviously be a bad thing!). Now that we have the delegate infrastructure in place, observe the updates to the Program class: class Program { static void Main(string[] args) { Console.WriteLine("***** Delegates as event enablers *****"); // Make a car as usual. Car c1 = new Car("SlugBug", 100, 10); // Register event handlers with Car type. c1.OnAboutToBlow(new Car.AboutToBlow(CarAboutToBlow)); c1.OnExploded(new Car.Exploded(CarExploded));

public class MainWindow : Form { protected override void OnMouseDown(MouseEventArgs e) { // Add code for MouseDown event. // Call parent implementation when finished. base.OnMouseDown(e); } } While this can be helpful in some circumstances (especially if you are building a custom control that derives from a standard control; see 21), you will often handle events using the standard C# event syntax (in fact, this is the default behavior of the Visual Studio 2005 designers). When you do so, the framework will call your custom event handler once the parent s implementation has completed: public class MainWindow : Form { public MainWindow() { MouseDown += new MouseEventHandler(MainWindow_MouseDown); } void MainWindow_MouseDown(object sender, MouseEventArgs e) { // Add code for MouseDown event. } } Beyond these OnXXX() methods, here are a few other methods to be aware of: Hide(): Hides the control and sets the Visible property to false Show(): Shows the control and sets the Visible property to true Invalidate(): Forces the control to redraw itself by sending a Paint event To be sure, the Control class does define additional properties, methods, and events beyond the subset you ve just examined. You should, however, now have a solid understanding regarding the overall functionality of this base class. Let s see it in action.

With the humble ordered, unordered, and definition lists, you can create a raft of features on a web page and style it in CSS to suit almost any whim. It s no longer a technique that s exclusive to just a handful of in-the-know web standards snobs with their shiny, up-to-the-minute browsers it s something that enjoys excellent support across current browsers. There is no excuse for not using lists where a list is the perfect candidate for the job. Simple markup combined with some clever CSS and some nice graphical touches it s a winner every time. And with that, it s time to look at the oft-uncharted territory of styling for print and other media.

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