Type patterns in C Sharp (C#) - Mini Project: Build & Apply

Type Patterns in C#

📖 Scenario: You are building a simple program that checks the type of different objects and prints a message based on their type. This is useful when you want to handle different data types differently in your code.

🎯 Goal: Create a program that uses type patterns in C# to identify if an object is an int, string, or bool and prints a message accordingly.

📋 What You'll Learn

Create an object variable with different values

Create a variable to hold the current object value

Use switch expression with type patterns to check the object's type

Print the message based on the type detected

💡 Why This Matters

🌍 Real World

Type patterns help programs decide what to do based on the kind of data they receive, like checking if a user input is a number or text.

💼 Career

Understanding type patterns is useful for writing clean and safe code that handles different data types correctly, a common task in software development.

1

Create an object variable with a value

Create an object variable called value and set it to the integer 42.

C Sharp (C#)

object value = null;
// Your code here

Need a hint?

Use object value = 42; to create the variable.

2

Create a variable to hold the current object

Create a variable called currentValue and assign it the value of value.

C Sharp (C#)

object value = 42;
// Your code here

Need a hint?

Assign value to currentValue like this: object currentValue = value;

3

Use switch expression with type patterns

Use a switch expression on currentValue with type patterns to check if it is an int, string, or bool. Store the result in a string variable called message. Use these messages:
"Integer value: {i}" for int,
"String value: {s}" for string,
"Boolean value: {b}" for bool,
and "Unknown type" for others.

C Sharp (C#)

object value = 42;
object currentValue = value;
// Your code here

Need a hint?

Use a switch expression with type patterns like int i => to match types.

4

Print the message

Write a Console.WriteLine statement to print the message variable.

C Sharp (C#)

object value = 42;
object currentValue = value;
string message = currentValue switch
{
    int i => $"Integer value: {i}",
    string s => $"String value: {s}",
    bool b => $"Boolean value: {b}",
    _ => "Unknown type"
};
// Your code here

Need a hint?

Use Console.WriteLine(message); to print the message.