// Immutable User Class in C# (Enforce Immutability)
using System;
// Immutable User class
public sealed class User
{
// Private readonly fields → cannot be modified after construction
private readonly int _id;
private readonly string _name;
// Public read‑only properties expose values safely
public int Id => _id;
public string Name => _name;
// Constructor initializes all immutable fields exactly once
public User(int id, string name)
{
_id = id;
_name = name;
}
// No setters → immutability enforced
}
public class Program
{
public static void Main()
{
// Create an immutable User object
User u = new User(42, "Alexander");
Console.WriteLine("ID: " + u.Id);
Console.WriteLine("Name: " + u.Name);
// The following lines would cause compile‑time errors:
// u.Id = 100; // ERROR: Property or indexer cannot be assigned to - it is read only
// u.Name = "Alfred"; // ERROR: Property or indexer cannot be assigned to - it is read only
// u._id = 100; // ERROR: inaccessible due to its protection level
// u._name = "Alfred"; // ERROR: inaccessible due to its protection level
// The object is fully immutable
}
}
/*
run:
ID: 42
Name: Alexander
*/
