Why Delegate declaration and instantiation in C Sharp (C#)? - Purpose & Use Cases

The Big Idea

What if you could pass around instructions like notes instead of repeating yourself every time?

The Scenario

Imagine you want to tell different friends to do different tasks, but you have to call each friend by their full name every time and explain the task again and again.

The Problem

This way is slow and confusing because you repeat yourself a lot, and if you want to change the task, you have to find every place you told a friend what to do and update it manually.

The Solution

Delegates let you create a simple 'task note' that you can pass around and call whenever you want, without repeating the details. You just declare the delegate once and then assign different tasks to it easily.

Before vs After

✗ Before

void CallFriend() { Friend1Task(); Friend2Task(); }

✓ After

delegate void Task(); Task myTask = Friend1Task; myTask();

What It Enables

Delegates make your code flexible and reusable by letting you assign and call methods dynamically like passing notes to friends.

Real Life Example

In a game, you can use delegates to assign different actions to buttons without rewriting the button code for each action.

Key Takeaways

Delegates act like pointers to methods, letting you call methods indirectly.

They reduce repeated code and make changing behavior easier.

Delegates enable flexible and dynamic method calls.