What is the difference between Delegate & Action in C#

Question

If I searched I will definitely get examples of showing what is a Delegate and Action. I have read the basic books giving examples of delegate.

But what I want to know is their use in the real world. Please do not give Hello World example or the Animal class they are far too basic

For e.g. :

1. What are the difference between them
2. When to use a delegate or action
3. When not to use a delegate or action
4. When they can be an over kill

Answer 1

Action is a Delegate. It is defined like this:

public delegate void Action(); 

You could create your own delegate types similarly to how you would create abstract methods; you write the signature but no implementation. You then create instances of these delegates by taking the reference of a method.

class Program {     public static void FooMethod()     {         Console.WriteLine("Called foo");     }      static void Main()     {         Action foo = FooMethod; // foo now references FooMethod()         foo(); // outputs "Called foo"     } }