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Even though the HelpIconProvider isn t a dedicated control, it still has a graphical representation. It creates this representation dynamically when you attach it to other controls. To do this, the HelpIconProvider retrieves a reference to the form that contains the extended control and adds a small PictureBox control with a question mark icon in it. This approach complicates the code. First of all, the HelpIconProvider now needs to include two collections. The first collection, named contextIDs, keeps track of each extended control and the associated Help context ID. The second collection, named pictures, stores the dynamically generated PictureBox control: // Store the context-senstive ID for each control. private Dictionary<Control, string> contextIDs = new Dictionary<Control, string>(); // Store the dynamically inserted PictureBox controls. private Dictionary<Control, PictureBox> pictures = new Dictionary<Control, PictureBox>(); The next challenge is in adding the PictureBox. You could do this when the SetHelpText() method is called. Unfortunately, if the developer configures the form at design time, the SetHelpText() method will be called before the extended control has been added to the form. As a result, the HelpIconProvider won t be able to find the form and add the required PictureBox. The solution to this challenge is the use the ISupportInitialize interface introduced in 13. That way, the SetHelpText() method can register itself with the appropriate context ID, and the HelpIconProvider can add the associated PictureBox when the ISupportInitialize. EndInit() method is called, when all the controls are sited on the form. [ProvideProperty("HelpID", typeof(Control))] public class HelpIconProvider : Component, IExtenderProvider, ISupportInitialize { ... } However, the ISupportInitialize approach adds its own stumbling block namely, it works only for controls added at design time. If you call SetHelpText() programmatically, the PictureBox won t be added because the EndInit() method has already been invoked.

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The overall organization of the MySQL server architecture is a layered, but not particularly hierarchical, structure. We make the distinction here that the subsystems in the MySQL server architecture are quite independent of each other. In a hierarchical organization, subsystems depend on each other in order to function, as components derive from a tree-like set of classes. While there are indeed tree-like organizations of classes within some of the subsystems notably in the SQL parsing and optimization subsystem the subsystems themselves do not follow a hierarchical arrangement. A base function library and a select group of subsystems handle lower-level responsibilities. These libraries and subsystems serve to support the abstraction of the storage engine systems, which feed data to requesting client programs. Figure 4-1 shows a general depiction of this layering, with different subsystems identified. We ll cover each of the subsystems separately in this chapter. Note that client programs interact with an abstracted API for the storage engines. This enables client connections to issue statements that are storage-engine agnostic, meaning the client does not need to know which storage engine is handling the data request. No special client functions are required to return InnoDB records versus MyISAM records. This arrangement enables MySQL to extend its functionality to different storage requirements and media. We ll take a closer look at the storage engine implementation in the Storage Engine Abstraction section later in this chapter, and discuss the different storage engines in detail in the next chapter.

The solution is to consider the state of the extended control, and add the PictureBox at the most appropriate time. The SetHelpID() method accomplishes this by testing the Control.Parent for a null reference. If no parent is found, the control isn t registered. Either way, it s still appropriate to add the control to the contextIDs collection. Here s the complete code for the SetHelpID() method: public void SetHelpID(Control extendee, string value) { // A blank value string indicates the control is trying to unregister. if (value.Length == 0) { // Check if the item is registered. if (pictures.ContainsKey(extendee) && !DesignMode) { // Perform this step only if the form is created. if (extendee.Parent != null) UnRegister(extendee); } // Stop maintaining the help ID. contextIDs.Remove(extendee); } else { // The user has supplied a value. // Check if the item is registered. if (!pictures.ContainsKey(extendee) && !DesignMode) { if (extendee.Parent != null) Register(extendee); } // Update or store the help ID. contextIDs[extendee] = value; } } You ll notice that the SetHelpID() method actually relies on two private methods Register() and Unregister() to create the PictureBox. This way, you can call the same methods from the EndInit() method, rather than coding the same code in two places. Here s the code you need: public void BeginInit() {} public void EndInit() { // No design-time PictureBox controls are created. // Add them now.

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