Elucidate delegates C#

Question

Hi, I'm a naive to C#, trying to understand Delegate. I have read few articles describing delegate as

• - Type-safe function pointer
• - Used to define callback functions (methods that have something to-return)
• - Call multiple methods on single event

As C# is Object-Oriented & every object can be related to a real world entity, i believe delegates in real-world are 'people from one country/ team/ organization'

 

> Trump says North Korea **delegates** will deliver letter from Kim Jong Un about summit.

> Delegates from Microsoft talk about Github acquisition.

 

So delegate will have same parameters and return type as of underlying method the delegate refers to. As per https://docs.microsoft.com/en-us/dotnet/csharp/programming-guide/delegates/#delegates-overview

 

1. Delegates allow methods to be passed as parameters. - We can also pass methods as parameters to other methods. Console.WriteLine(foo.ToString());

 

2. Delegates can be used to define callback methods. - Methods with return keyword perform as delegates, because delegate is just a bridge between callee and caller methods.

 

3. Delegates can be chained together; for example, multiple methods can

be called on a single event. - As methods can also be chained.

Caller method()
{
   // Callee method1();
      Callee method2();
   // Callee method3();
}

which could also be invkoed from single event

 

I assume, we see delegates working in background when we copy/cut & paste files/folders from Source to Destination. Because files are moved from source to Destination but how does progress-bar window know about current fileName & amount of progress to be filled in progress-bar.?

 

So, Why & When to use delegate? (As delegate points to a function which has required functionality to execute, why can't i call a function directly instead calling delegate?)

 

P.S @all C# corner members/ users - Please help me to understand delegate in & out.

 

Thanks in advance.