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In object-oriented programming it is sometimes helpful to define what a class must do, but not how it will do it You have already seen an example of this: the abstract method An abstract method declares the return type and signature for a method, but provides no implementation A derived class must provide its own implementation of each abstract method defined by its base class Thus, an abstract method specifies the interface to the method, but not the implementation Although abstract classes and methods are useful, it is possible to take this concept a step further In C#, you can fully separate a class interface from its implementation by using the keyword interface Interfaces are syntactically similar to abstract classes However, in an interface, no method can include a body That is, an interface provides no implementation whatsoever It specifies what must be done, but not how Once an interface is defined, any number of classes can implement it Also, one class can implement any number of interfaces To implement an interface, a class must provide bodies (implementations) for the methods described by the interface Each class is free to determine the details of its own implementation Thus, two classes might implement the same interface in different ways, but each class still supports the same set of methods Therefore, code that has knowledge of the interface can use objects of either class since the interface to those objects is the same By providing the interface, C# allows you to fully utilize the one interface, multiple methods aspect of polymorphism

8702 Wheel Torque 6462 9693 12924 16155 19386 22617 25848 29079 32310 35541 38772 42003 45234 48465 51696 54927 58158 61389 64620 Vehicle Speed 8906 7354 5746 5286 4711 4482 4252 4022 3907 3850 3735 3620 3505 3447 3390 3333 3275 3218 3160 Wheel Torque

Part I:

And we are finished. Compile and run the application to display properties for an album. Note the following aspects of the Album Properties dialog: This dialog can be displayed for an empty album, as opposed to the Photo Properties dialog, which requires at least one photograph in the album in order to appear. The title bar updates as the title changes. The radio buttons receive focus as a group. If you use the Tab key to move through the form, this is readily apparent. Note how the arrow keys can be used to modify the selected radio button from the keyboard.

Interfaces are declared by using the interface keyword Here is a simplified form of an interface declaration: interface name { ret-type method-name1(param-list); ret-type method-name2(param-list); // ret-type method-nameN(param-list); } The name of the interface is specified by name Methods are declared using only their return type and signature They are, essentially, abstract methods As explained, in an interface, no method can have an implementation Thus, each class that includes an interface must implement all of the methods In an interface, methods are implicitly public, and no explicit access specifier is allowed Here is an example of an interface It specifies the interface to a class that generates a series of numbers

The radio buttons receive focus when you type the access key Alt+O to activate the GroupBox control. Modifying the display option for the album alters the Photograph setting displayed in the status bar of the main form. The password entry controls are enabled and disabled automatically as the CheckBox control is clicked. Note how the txtPassword control receives focus automatically when the controls are enabled. Try to enter a blank password or an invalid confirmation password to see how the validation behaves for these controls. Feel free to experiment with some of the settings here. Also make sure the album and photograph settings are saved and restored properly whenever you close and later open an album.

public interface ISeries { int GetNext(); // return next number in series void Reset(); // restart void SetStart(int x); // set starting value }

The name of this interface is ISeries Although the prefix I is not necessary, many programmers prefix interfaces with I to differentiate them from classes ISeries is declared public so that it can be implemented by any class in any program In addition to methods, interfaces can specify properties, indexers, and events Events are described in 15, and we will be concerned with only methods, properties, and indexers here Interfaces cannot have data members They cannot define constructors, destructors, or operator methods Also, no member can be declared as static

TRY IT!

The ref parameter modifier causes C# to create a call-by-reference, rather than a call-byvalue The ref modifier is specified when the method is declared and when it is called Let s begin with a simple example The following program creates a method called Sqr( ) that returns in-place the square of its integer argument Notice the use and placement of ref

Use the Appearance property to modify the radio buttons in the AlbumEditDlg form to be toggle buttons rather than normal radio buttons. Compile and run the program to see the toggle button behavior in action. Users typically expect normal radio buttons for situations like this, so make sure you have a good reason for using an alternate appearance when you choose to do so.