how to make a class immutable

Question

William Myron · Accepted Answer

There are two ways to implement the Immutable class.
Approach #1
Read Only properties
Parametrized constructor to initialize properties,
public class Person
    {    
        // Read-only properties.       
        public string Name { get; }    
        public string Article { get; private set; }    
    
        // Public constructor.       
        public Writer1(string authorName, string articleName)    
        {    
            Name = authorName;    
            Article = articleName;    
        }    
    }    

Approach #2
Read-Only Properties
Static method
Private paramterized constructor to initialize properties,
public class Person    
    {    
        // Read-only properties.       
        public string Name { get; private set; }    
        public string Article { get; }    
    
        // Private constructor.       
        private Writer2(string authorName, string articleName)    
        {    
            Name = authorName;    
            Article = articleName;    
        }    
    
        // Public factory method.       
        public static Writer2 GetArticle(string name, string article)    
        {    
            return new Writer2(name, article);    
        }    
    }    

It is important to note 
that read-only properties and a parameterized constructor are key to ingredients to the recipe of immutable classes.

William Myron · Answer

There are two ways to implement the Immutable class.
Approach #1
Read Only properties
Parametrized constructor to initialize properties,
public class Person
    {
        // Read-only properties.
        public string Name { get; }
        public string Article { get; private set; }

        // Public constructor.
        public Person(string authorName, string articleName)
        {
            Name = authorName;
            Article = articleName;
        }
    }

Approach #2
Read-Only Properties
Static method
Private paramterized constructor to initialize properties,
public class Person
    {
        // Read-only properties.
        public string Name { get; private set; }
        public string Article { get; }

        // Private constructor.
        private Person(string authorName, string articleName)
        {
            Name = authorName;
            Article = articleName;
        }

        // Public factory method.
        public static Person GetArticle(string name, string article)
        {
            return new Person(name, article);
        }
    }

It is important to note
that read-only properties and a parameterized constructor are key to ingredients to the recipe of immutable classes.

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