In this exercise, you'll create a Customer Maintenance...

In this exercise, you'll create a Customer Maintenance application that uses classes with the features presented in this chapter. To make this application easier to develop, we'll give you the starting forms and classes. Add a delegate named ChangeHandler to the CustomerList class. This delegate should specify a method with a void return type and a CustomerList parameter as described in figure $13-5$.

In this exercise, you'll create a Customer Maintenance application that uses classes with the features presented in this chapter. To make this application easier to develop, we'll give you the starting forms and classes.

Add a delegate named ChangeHandler to the CustomerList class. This delegate should specify a method with a void return type and a CustomerList parameter as described in figure $13-5$.

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Key Concepts

Delegate

A delegate is a type that encapsulates a reference to a method with a specific signature, essentially acting as a function pointer. In object-oriented programming, particularly in languages like C#, delegates enable methods to be passed as parameters, stored in variables, and called dynamically, which is especially useful for implementing callbacks and event-handler patterns.

Method Signature

The method signature defines the return type and the parameters that a method must have for it to be considered compatible with a particular delegate. In this context, defining a delegate with a void return type and a specific parameter of a given class ensures that any method assigned to the delegate conforms to this signature, maintaining type safety and consistency.

Encapsulation in Classes

Encapsulation is a core principle of object-oriented programming that involves bundling data and methods that operate on that data within a class. By adding a delegate to a class like the CustomerList, the class can expose a mechanism for notifying or handling changes internally, while keeping the specific implementation details hidden, thereby promoting modularity and maintainability.

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