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

Using Property Patterns in C#

📖 Scenario: You are building a simple program to check if a person is an adult living in a specific city. You will use property patterns to make your code clear and easy to read.

🎯 Goal: Create a Person class with properties, then use property patterns to check if a person is an adult living in "New York".

📋 What You'll Learn

Create a Person class with Name, Age, and City properties

Create an instance of Person with specific values

Use a property pattern in an if statement to check if the person is at least 18 years old and lives in "New York"

Print a message based on the property pattern check

💡 Why This Matters

🌍 Real World

Property patterns help write clear and readable code when checking multiple properties of objects, common in user data validation or filtering.

💼 Career

Understanding property patterns is useful for writing maintainable C# code in jobs involving backend development, data processing, or any object-oriented programming tasks.

1

Create the Person class

Create a public class called Person with three public properties: Name of type string, Age of type int, and City of type string.

C Sharp (C#)

# Your code here

Need a hint?

Use public class Person and add three properties with get and set.

2

Create a Person instance

Create a variable called person and assign it a new Person object with Name set to "Alice", Age set to 20, and City set to "New York".

C Sharp (C#)

public class Person
{
    public string Name { get; set; }
    public int Age { get; set; }
    public string City { get; set; }
}

// Your code here

Need a hint?

Use object initializer syntax to set the properties when creating person.

3

Use property pattern to check person details

Write an if statement that uses a property pattern to check if person has Age greater than or equal to 18 and City equal to "New York".

C Sharp (C#)

public class Person
{
    public string Name { get; set; }
    public int Age { get; set; }
    public string City { get; set; }
}

Person person = new Person { Name = "Alice", Age = 20, City = "New York" };

// Your code here

Need a hint?

Use the is keyword with a property pattern inside the if condition.

4

Print the result

Add an else block to print "Person does not meet the criteria." if the property pattern check fails. Then run the program to see the output.

C Sharp (C#)

public class Person
{
    public string Name { get; set; }
    public int Age { get; set; }
    public string City { get; set; }
}

Person person = new Person { Name = "Alice", Age = 20, City = "New York" };

if (person is { Age: >= 18, City: "New York" })
{
    System.Console.WriteLine("Person is an adult living in New York.");
}
// Your code here

Need a hint?

Use an else block with a Console.WriteLine to print the alternative message.