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album For example, a genealogy program for creating family trees might want to link to a photo album of a specific person or family So we will place our new classes in a library that other programs can reuse In Windows parlance, such a library is called a Dynamic Link Library, or DLL 511 INTERFACES As you might expect, the NET Framework provides a number of classes that can help us here These classes implement common data structures such as arrays, stacks, queues, and hash tables Before the ever-appropriate table summarizing such classes, this is a good place to introduce the idea of an interface An interface is an abstraction of an abstraction, and should be familiar to programmers of COM or its UNIX ancestor, the distributed computing environment (DCE).

While a class encapsulates a data structure and its operations, an interface encapsulates a type of data structure and its operations This is very similar to an abstract class, except that an interface does not provide any implementations for its members, it just defines the properties, methods, and events that a class should implement in order to support the interface In practice, an interface is a good way to encapsulate a common idea for use by a number of possibly unrelated classes, while an abstract class is a good way to encapsulate a common idea for use by a number of related classes For example, the NET ICloneable interface defines a type of class that can be cloned, or copied, from an existing class instance to a new one1 This concept applies to the Array, Brush, Font, String, and a number of other classes throughout the NET Framework.

Languages such as C++ provide multiple inheritance for this type of support In C++, ICloneable could be an abstract class and inherited where needed In C# and Java, only single inheritance is supported, so this is not possible Instead, both languages provide interfaces as a way to encapsulate common functionality that can be used by a wide range of classes For example, the Brush class supports the ICloneable interface We used this abstract class in chapter 4 to create an owner-drawn status bar panel Brush objects can be cloned to create a new copy of an existing Brush You can create an instance of a Brush, since it is a class, but you cannot create an instance of an ICloneable except as a by-product of an existing class that happens to support this interface The .

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NET Framework provides interfaces for everything from enumerating members of a set to transferring data between applications Some interfaces related to our current discussion on albums are listed in the following table..

Generally speaking, cloning in .NET always produces a deep copy of an object, as we saw for the menu classes in chapter 3.