Object-Oriented C#

Records and Value Equality

Represent immutable data with concise record types.

Introduction

Records are ideal for data-centric models where equality should depend on values.

The with expression creates a copy with one changed property, leaving the original record unchanged.

Runnable C# example

Program.cs

using System;

record User(string Name, string Role);

class Program
{
    static void Main()
    {
        var original = new User("Ada", "Developer");
        var promoted = original with { Role = "Lead" };
        Console.WriteLine(promoted);
    }
}

Result of running the code

User { Name = Ada, Role = Lead }

Practice with the debugger

Set a breakpoint on an important assignment or condition, click Debug, and inspect the local values before stepping to the next line.

Practice with a challenge

Use what this lesson covers to solve a real problem. Each challenge runs in your browser with instant tests and an AI review.

Unique Records Remove duplicate records that are equal by value, keeping the first of each in order. Easy

All challenges