[Solved] Given this record declaration:public record Book { public string Title { get; init; } public string Author { get; init;... Console.WriteLine(book2.Title + ", " + book2.Author);What is the output? | C Sharp (C#)

C Sharp (C#) - Properties and Encapsulation

Given this record declaration:

public record Book {
    public string Title { get; init; }
    public string Author { get; init; }
}

var book1 = new Book { Title = "C# Guide", Author = "Jane" };
var book2 = book1 with { Author = "John" };

Console.WriteLine(book2.Title + ", " + book2.Author);

What is the output?

AC# Guide, John

BC# Guide, Jane

CCompile-time error due to init-only setter

DRuntime exception

Step-by-Step Solution

Solution:

Step 1: Understand 'with' expression on records
The 'with' expression creates a copy of book1 but allows changing init-only properties during creation of the new object.
Step 2: Analyze the output
book2 copies Title as "C# Guide" and sets Author to "John". Printing shows "C# Guide, John".
Final Answer:
C# Guide, John -> Option A
Quick Check:
'with' allows changing init-only during copy [OK]

Quick Trick: 'with' can set init-only properties on new record copies [OK]

Common Mistakes:

MISTAKES

Thinking 'with' cannot change init-only properties
Expecting compile error on 'with' usage
Confusing init-only with immutable fields

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More C Sharp (C#) Quizzes

Given this record declaration:

Step 1: Understand 'with' expression on records

Step 2: Analyze the output

Final Answer:

Quick Check:

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