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Note You may use the base keyword anytime a subclass wishes to access a public or protected member defined by a parent class. Use of this keyword is not limited to constructor logic. You will see examples using base in this manner during the examination of polymorphism later in this chapter.

Finally, recall that once you add a custom constructor to a class definition, the default constructor is silently removed. Therefore, be sure to redefine the default constructor for the SalesPerson and Manager types, for example: // Add back the default ctor // in the Manager class as well. public SalesPerson() {}

request. This approach reduces overall PHP and MySQL overhead but still requires Apache (or Nginx, IIS, lighthttpd) to process a few extra rewrite rules for each page request. The key to good Boost performance is to put the Boost cache directory on a fast local file system. Some Drupal admins may consider writing Boost cache files into a shared network file system so that many web servers can share the same Boost cache files; however, a busy web site can have a lot of file system I/O arise from Boost cache maintenance, so much so that a network shared file system slows down considerably, in which case the Boost cache ought to be a local directory on each web server instead. If each web server has extra memory but slow disks, then you may also consider writing your Boost cache files to a local ramfs file system, which is a feature of Linux that allows you to create an ephemeral storage volume that exists entirely in RAM.

As you already know, public items are directly accessible from anywhere, while private items can only be accessed by the class that has defined it. Recall from 5 that C# takes the lead of many other modern object languages and provides an additional keyword to define member accessibility: protected. When a base class defines protected data or protected members, it establishes a set of items that can be accessed directly by any descendent. If you wish to allow the SalesPerson and Manager child classes to directly access the data sector defined by Employee, you can update the original Employee class definition as follows: // protected state data. partial class Employee { // Derived classes can now directly access this information. protected string empName; protected int empID; protected float currPay; protected int empAge; protected string empSSN; protected static string companyName; ... } The benefit of defining protected members in a base class is that derived types no longer have to access the data indirectly using public methods or properties. The possible downfall, of course, is that when a derived type has direct access to its parent s internal data, it is very possible to accidentally bypass existing business rules found within public properties. When you define protected members, you are creating a level of trust between the parent and child class, as the compiler will not catch any violation of your type s business rules. Finally, understand that as far as the object user is concerned, protected data is regarded as private (as the user is outside of the family). Therefore, the following is illegal: static void Main(string[] args) { // Error! Can't access protected data from object instance. Employee emp = new Employee(); emp.empName = "Fred"; }

Note Although protected field data can break encapsulation, it is quite safe (and useful) to define protected methods. When building class hierarchies, it is very common to define a set of methods that are only for use by derived types.

Recall that a sealed class cannot be extended by other classes. As mentioned, this technique is most often used when you are designing a utility class. However, when building class hierarchies, you might find that a certain branch in the inheritance chain should be capped off, as it makes no sense to further extend the linage. For example, assume you have added yet another class to your program (PTSalesPerson) that extends the existing SalesPerson type. Figure 6-5 shows the current update.