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Extender providers work by hooking into control events. Essentially, every provider tracks specific events that occur in a group of one or more controls. It s up to you to register a control with an extender provider to set up this link. When you do, the provider attaches its event handlers. For example, the HelpProvider monitors key presses for the F1 key. When you register a control with the HelpProvider, it attaches an event handler to that control s KeyPress event. When the F1 key is pressed, it springs into action. Extender providers have both advantages and drawbacks. The key advantage is that the model is much more loosely coupled than custom controls. For example, imagine you derive a custom control from the ComboBox class and override several protected members. A future version of the ComboBox class could change its internal logic enough to break your derived class. This problem is much less likely if you create an extender provider for the ComboBox. An extender provider reacts only to events, and event definitions are unlikely to change because they are a part of the control s public interface. Figure 25-1 compares the two approaches. Additionally, because your extender provider supports the ComboBox, it also supports any custom control that derives from ComboBox. If you created your own custom ComboBox control, this type of integration wouldn t be possible. The loosely coupled provider model also allows you to extend controls that have sophisticated design-time features, without forcing you to re-implement details like control builders. That s because you re not changing the original control you re just adding to the existing model.

Note This installation package includes the ODAC.NET components as well as ODT.NET, covered in s 14 and 15 of this book.

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Figure 25-1 Custom controls (left) versus extender providers (right) Another advantage of this loosely coupled design is the fact that your extender provider doesn t need to be coded to a single specific control class It s quite easy to create an extender provider that extends multiple types of controls, or even one that extends every control In this chapter you ll see a provider that extends all classes derived from ToolStripItem Not only does this support all the ToolStripItem controls in the NET class library; it also works equally well with custom ToolStripItem classes that other developers may create in the future The key limitation of extender providers is that they really have only one point of extensibility: control events If you want to react to a certain action but a control doesn t define an event for that action, you re out of luck.

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The first screen in the universal installer (shown in Figure 2-14) allows you to install ODAC.NET for the Oracle client or server. The first option is meant to be installed on client machines accessing the Oracle database, while the second option is meant to be installed on the server hosting the Oracle database. In a .NET Winforms application scenario for instance, you might have installed the Oracle database on a server. For each client machine that needs to access the database over the network, you would need to install ODAC for Oracle Client. ODAC for Oracle Client not only installs the ODP.NET libraries necessary but also the Oracle client software necessary for access to the Oracle database. It can therefore be used for installation on a clean machine.

Custom controls suffer from this limitation, but to a lesser extent That s because a custom control can override protected methods, which often provide access to some of the internal workings of a control A typical control will provide many more protected methods than public events, and so it has more extensibility points when you create a custom control It would be difficult to implement a derived control like the DirectoryTree (shown in 11) using an extender provider, because it changes the control too much Even if you could, the result wouldn t be as intuitive, because extender providers don t give you the freedom to hide unnecessary members and add design-time frills to the control you re extending Overall, extender providers tend to be specialized solutions, and you may design dozens of custom controls before even contemplating a custom provider Nonetheless, custom providers can achieve some remarkable tricks.

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