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Technically, the filtering methods allow you to modify a System.ComponentModel.TypeDescriptor object that stores the property, attribute, and event information for your custom control. Visual Studio uses the information from this TypeDescriptor to determine what it makes available in the design-time environment.

The solution in Listing 3-1 depends on a special file in your Oracle installation. This file is commonly referred to as the TNSNames.ora file and is located in the following folder:

As an application developer, your primary focus is coding the solution that accomplishes the given problem domain outlined in the project definition. The database is your tool for storing all the data that the problem domain involves. Your concerns lie largely in retrieving and manipulating the information, rather than in how this data is physically stored. Armed with one or more programming languages, you go about the arduous task of addressing each of the functional requirements of the project. Working closely with the business analyst to ensure that application pieces meet requirements, you use the table blueprints created by the database designer to construct a solid framework for data access. Using the principles of tiered application design and object-oriented development, you work toward creating a single data access layer, which forms the plumbing that moves data in and out of the database to and from the application and presentation layers.

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To filter the Nodes property so it doesn t appear in the DirectoryTree control, you need a control designer that overrides the PostFilterProperties() method. Here s the complete control designer code: public class DirectoryTreeDesigner : ControlDesigner { protected override void PostFilterProperties(System.Collections.IDictionary properties) { properties.Remove("Nodes"); base.PostFilterProperties(properties); } } Now, when you recompile the control and test it in the client, you ll notice that the Nodes property does not appear in the Properties window. However, the Nodes property is still accessible in code. This allows clients to perform other useful tasks (like enumerating through the collection of nodes) at their discretion. This code also ensures that the Nodes collection is not serialized at design time, effectively sidestepping the problem where the same set of drive nodes is added more than once to an instance of the DirectoryTree control. You can extend this example to get rid of other details you don t need. For example, you might want to remove the AfterSelect event from view because you ve added a more useful DirectorySelected event. Here s how you d do that: protected override void PostFilterEvents(System.Collections.IDictionary events) { events.Remove("AfterSelect"); base.PostFilterEvents(events); }

You can edit it by hand using the Microsoft Notepad program. Inside this file, you might see one or more blocks of configuration data that look like that in Listing 3-2. Listing 3-2. Format of a TNS Descriptor

While data access components and libraries often look similar to the database schema to and from which they map information movement, this is by no means a necessity. Good data access frameworks must provide application programmers with a consistent and organized method for retrieving data. A successful software project requires an application developer who can listen to and incorporate the concerns of other project team members into a cohesive application framework.

Just as you can remove properties and events in the PostFilterXxx() methods, you can also add properties events in the PreFilterXxx() methods. This technique is most commonly used with properties in the PreFilterProperties() method. It s important to realize that when you add a property in the PreFilterProperties() method, you aren t adding it to the underlying control. Instead, you re adding a design-time-only property that your designer is responsible for tracking. It s also your designer that reacts if the property is changed to alter some aspect of the design-time experience. For example, consider the MarqueeLabel first shown in 12. In this control, it makes sense not to fire the timer events at design time, and for that reason, the timer isn t enabled when the control is in design mode. But what would it take to give the developer the choice as to whether the label should scroll or stay fixed It turns out this design is quite easy to implement with a design-time property.

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