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Advanced C# Programming

Constructs

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Working with Interfaces

T

his chapter builds on your current understanding of object-oriented development by examining

the topic of interface-based programming. Here you learn how to define and implement interfaces,

and come to understand the benefits of building types that support “multiple behaviors.” Along the

way, a number of related topics are also discussed, such as obtaining interface references, explicit

interface implementation, and the construction of interface hierarchies.

The remainder of this chapter is spent examining a number of standard interfaces defined

within the .NET base class libraries. As you will see, your custom types are free to implement these

predefined interfaces to support a number of advanced behaviors such as object cloning, object

enumeration, and object sorting. We wrap up the chapter by examining how interface types can be

used to establish a callback mechanism, allowing two objects in memory to communicate in a

bidirectional manner.