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

Using Func Delegate Type in C#

📖 Scenario: You are building a simple calculator program that can perform different operations on numbers. You want to use a Func delegate to hold the operation logic and apply it to numbers.

🎯 Goal: Create a program that uses a Func<int, int, int> delegate to perform addition or multiplication on two numbers.

📋 What You'll Learn

Create a Func<int, int, int> delegate variable named operation

Assign a lambda expression for addition to operation

Change operation to a lambda expression for multiplication

Invoke operation with two integers and print the result

💡 Why This Matters

🌍 Real World

Using <code>Func</code> delegates lets you pass around blocks of code as variables. This is useful in event handling, callbacks, and functional programming.

💼 Career

Understanding delegates and lambda expressions is important for C# developers working on flexible and reusable code, especially in UI programming and asynchronous tasks.

1

Create a Func delegate for addition

Create a Func<int, int, int> delegate variable called operation and assign it a lambda expression that adds two integers: (a, b) => a + b.

C Sharp (C#)

// Your code here

Need a hint?

Use Func<int, int, int> to declare a delegate that takes two integers and returns an integer. Assign a lambda expression for addition.

2

Change the operation to multiplication

Change the operation delegate to a lambda expression that multiplies two integers: (a, b) => a * b.

C Sharp (C#)

Func operation = (a, b) => a + b;
// Your code here

Need a hint?

Assign a new lambda expression to operation that multiplies the two parameters.

3

Invoke the operation delegate

Invoke the operation delegate with the integers 4 and 5, and store the result in an integer variable called result.

C Sharp (C#)

Func operation = (a, b) => a + b;
operation = (a, b) => a * b;
// Your code here

Need a hint?

Call operation like a function with arguments 4 and 5, and save the output in result.

4

Print the result

Print the value of the result variable using Console.WriteLine.

C Sharp (C#)

Func operation = (a, b) => a + b;
operation = (a, b) => a * b;
int result = operation(4, 5);
// Your code here

Need a hint?

Use Console.WriteLine(result); to display the multiplication result.