Record declaration syntax in C Sharp (C#) - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a record in C#?

A record is a special kind of class in C# designed to hold immutable data with built-in value-based equality.

beginner

How do you declare a simple record with two properties: Name (string) and Age (int)?

You declare it like this:<br>

public record Person(string Name, int Age);

beginner

What keyword is used to declare a record in C#?

The keyword record is used instead of class or struct.

intermediate

Can records have methods and custom constructors?

Yes, records can have methods and custom constructors just like classes, allowing you to add behavior.

intermediate

What is the difference between positional records and standard records?

Positional records declare properties in the record header for concise syntax, while standard records declare properties inside the body.

Which keyword is used to declare a record in C#?

A class

B struct

C record

D interface

The record keyword declares a record type in C#.

How do you declare a record with properties Name (string) and Age (int) using positional syntax?

A public class Person { string Name; int Age; }

B public record Person(string Name, int Age);

C public struct Person(string Name, int Age);

D public record Person { string Name; int Age; }

Positional records declare properties in the parentheses after the record name.

What feature do records provide by default?

A No inheritance

B Mutable properties only

C No constructors allowed

D Value-based equality

Records provide value-based equality, meaning two records with the same data are equal.

Can you add methods inside a record declaration?

A Yes, records can have methods.

B No, records cannot have methods.

C Only static methods are allowed.

D Only abstract methods are allowed.

Records can have methods just like classes.

Which of these is a valid way to declare a record with a custom constructor?

A public record Person { public string Name { get; init; } public Person(string name) { Name = name; } }

B public record Person(string Name) { public Person() { } }

C public record Person(string Name); public Person() { }

D public record Person { string Name; Person(string name) { Name = name; } }

You can declare properties and a custom constructor inside the record body.

Explain how to declare a positional record in C# and why you might use it.

Think about how to write properties directly in the record header.

Describe the main benefits of using records over classes for data storage.

Focus on how records handle data differently than classes.