How can you implement a read-only property Id that is set only once in the constructor using a private field _id?

hard🚀 Application Q9 of 15

C Sharp (C#) - Properties and Encapsulation

How can you implement a read-only property Id that is set only once in the constructor using a private field _id?

Aprivate readonly int _id; public int Id => _id; public ClassName(int id) { _id = id; }

Bprivate int _id; public int Id { get; set; } public ClassName(int id) { Id = id; }

Cpublic int Id { get; private set; } public ClassName(int id) { Id = id; }

Dprivate int _id; public int Id { get { return _id; } set { _id = value; } }

Step-by-Step Solution

Solution:

Step 1: Understand read-only property with private readonly field
Using a readonly field allows setting value only in constructor.
Step 2: Check options for correct implementation
private readonly int _id; public int Id => _id; public ClassName(int id) { _id = id; } uses a private readonly field, a getter-only property, and sets the field in constructor.
Final Answer:
Option A with readonly field and getter-only property. -> Option A
Quick Check:
Readonly fields set in constructor enable read-only properties [OK]

Quick Trick: Use readonly fields and getter-only properties for read-only data [OK]

Common Mistakes:

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