Delegates, actions, funcs, and predicates

Delegates are essentially type-safe function pointers, holding references to functions. This type of safety is crucial as it ensures that the function’s signature aligns with the delegate’s defined signature. Delegates enable methods to be passed as parameters, returned from functions, and stored in data structures, making them indispensable for event handling and other dynamic functionalities.

Delegates

Let’s apply the concept of delegates to a book publishing system. Imagine we need to notify different departments when a new book is published.

First, define a delegate matching the notification function’s signature:

public delegate void BookPublishedNotification(string bookTitle);

Next, create a class to manage book publishing that accepts a delegate in its method:

public class BookPublishingManager
{
    public void PublishBook(string bookTitle, BookPublishedNotification notifyDepartments...