Action delegate type in C Sharp (C#) - Mini Project: Build & Apply

Using the Action Delegate Type in C#

📖 Scenario: You are creating a simple program to greet users and show messages using the Action delegate type in C#. This helps you run small pieces of code stored in variables.

🎯 Goal: Build a program that stores greeting and farewell messages in Action delegates and runs them to display messages on the screen.

📋 What You'll Learn

Create an Action delegate variable called greet that prints a greeting message.

Create another Action delegate variable called farewell that prints a farewell message.

Invoke both greet and farewell to show the messages.

💡 Why This Matters

🌍 Real World

Using <code>Action</code> delegates helps you store and run small tasks or callbacks, like button clicks or timed events, in real programs.

💼 Career

Understanding delegates is important for event-driven programming and working with frameworks like Windows Forms, WPF, or ASP.NET.

1

Create an Action delegate called greet

Write a line of code to create an Action delegate variable named greet that prints "Hello, welcome!" when called.

C Sharp (C#)

using System;

class Program
{
    static void Main()
    {
        // Create an Action delegate called greet that prints "Hello, welcome!"
        
    }
}

Need a hint?

Use Action with a lambda expression that calls Console.WriteLine.

2

Create an Action delegate called farewell

Add a line of code to create an Action delegate variable named farewell that prints "Goodbye, see you soon!" when called.

C Sharp (C#)

using System;

class Program
{
    static void Main()
    {
        Action greet = () => Console.WriteLine("Hello, welcome!");
        // Create an Action delegate called farewell that prints "Goodbye, see you soon!"
        
    }
}

Need a hint?

Use the same pattern as greet but with the farewell message.

3

Invoke the greet and farewell delegates

Write code to call the greet and farewell delegates to display their messages.

C Sharp (C#)

using System;

class Program
{
    static void Main()
    {
        Action greet = () => Console.WriteLine("Hello, welcome!");
        Action farewell = () => Console.WriteLine("Goodbye, see you soon!");
        // Call greet and farewell to show messages
        
    }
}

Need a hint?

Call each delegate by adding parentheses after their names.

4

Display the output

Run the program and write a line of code to print the output of calling greet and farewell delegates.

C Sharp (C#)

using System;

class Program
{
    static void Main()
    {
        Action greet = () => Console.WriteLine("Hello, welcome!");
        Action farewell = () => Console.WriteLine("Goodbye, see you soon!");
        greet();
        farewell();
        // Output is shown by the calls above
    }
}

Need a hint?

The output appears automatically when you run the program because of the Console.WriteLine calls inside the delegates.