3 books on Delegates in C# [PDF]

When students start learning Delegates in C#, they usually can't understand why they were invented at all. Okay, so it's a reference to a method, but why not call the method directly? Teachers explain that this is how we raise the level of abstraction when describing a class, focusing on its specialization and moving the logic for selecting a specific class/method outside. But even if a student understands this idea, they can't understand the benefit: simplifying one class complicates another. And why not instead of Delegates, create regular helper classes, that can implement the method selection logic and store a reference to the method? Why introduce another entity into the language? Does that make it simpler? Probably not.

Books about Delegates provide the answer: Delegates were indeed invented to SIMPLIFY PROGRAMS. But this only works with large programs - delegates in small programs (with just a few classes) - only complicate.

When a program has a large number of classes, even more links between them arise. Classes call each other's methods, so each class must know its counterpart (the class it should call, the name of its method) and have access to it. In large programs, this network of links quickly devolves into chaos. And if something needs to be changed, many interconnected classes must be redesigned. Therefore, programmers intend to make classes more universal, so they can interact with any other class without knowing it individually.

The key expression programmers use to describe this mechanism is "reduction of responsibility". If instead of a reference to another specific class our class receives a black box - Delegate, we reduce its responsibility - it doesn't have to remember a specific counterparty.

Of course, in any program, there are classes that still remember specific counterparties, but if only one of two classes has the responsibility of remembering the counterparty, this simplifies our network twofold. Thus, Delegates greatly simplify the network between classes in large programs.

C# 3.0 Cookbook: More Than 250 solutions for C# 3.0 Programmers
2007 by Jay Hilyard, Stephen Teilhet


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Advanced C# Programming
2002 by Paul Kimmel


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Learning C# Through Small Projects
2024 by Denis Panjuta, Jafar Jabbarzadeh


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