C# 0 The Complete Reference

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 Chapter 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

.

Implementing Interfaces

Once an interface has been defined, one or more classes can implement that interface. To 

implement an interface, the name of the interface is specified after the class name in just 

the same way that a base class is specified. The general form of a class that implements an 

interface is shown here:

class

class-name

 : 

interface-name

 {

    // class-body

}

The name of the interface being implemented is specified in 

interface-name.

 When a class 

implements an interface, the class must implement the entire interface. It cannot pick and 

choose which parts to implement, for example.

A class can implement more than one interface. When a class implements more than one 

interface, specify each interface in a comma-separated list. A class can inherit a base class 

and also implement one or more interfaces. In this case, the name of the base class must 

come first in the comma-separated list.

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