Init-only setters in C Sharp (C#) - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is an init-only setter in C#?

An init-only setter allows a property to be set only during object initialization, making the property immutable after the object is created.

beginner

How do you declare an init-only property in C#?

Use the init keyword instead of set in the property declaration, like:

public string Name { get; init; }

beginner

When can you assign a value to an init-only property?

You can assign a value only during object creation or in the object initializer block, but not after the object is fully constructed.

intermediate

What happens if you try to set an init-only property after object initialization?

The compiler will give an error because init-only properties cannot be changed after the object is created.

intermediate

Why are init-only setters useful?

They help create immutable objects with simpler syntax, improving safety by preventing accidental changes after creation.

Which keyword is used to declare an init-only setter in C#?

A readonly

B set

C init

D const

The init keyword declares a setter that can only be used during object initialization.

When can you assign a value to a property with an init-only setter?

A Anytime after object creation

B Only in constructors

C Only inside methods

D Only during object initialization

Init-only setters allow assignment only during object initialization or in the initializer block.

What will happen if you try to set an init-only property after the object is created?

A Compiler error

B Value changes successfully

C Runtime exception

D Property is ignored

The compiler prevents setting init-only properties after initialization, causing a compile-time error.

Which of these is a benefit of using init-only setters?

A Creating immutable objects easily

B Allowing properties to change anytime

C Making properties private

D Improving runtime performance

Init-only setters help create immutable objects by restricting property changes after initialization.

How do init-only setters improve code safety?

A By making properties static

B By preventing accidental property changes after creation

C By hiding properties from other classes

D By allowing properties to be changed anywhere

They prevent accidental changes to properties after the object is created, improving safety.

Explain what init-only setters are and how they differ from regular setters in C#.

Think about when you can assign values to properties.

Describe a real-life scenario where using init-only setters would be beneficial.

Consider objects that should not change after being set up.