Question

How to declare and use private constructor in C#

Answer 1

using System;

namespace ConsoleApplication_C_Sharp
{
    class Program
    {
        public sealed class Test
        {
            public static readonly Test O = new Test(); 
            public int n;

            private Test() // private constructor
            {
                n = 13;
            }
        }

        static void Main(string[] args)
        {
            Test test = Test.O;
            
            Console.WriteLine(test.n);

            test.n += 150;
            Console.WriteLine(test.n);
        }
    }
}


/*
run:
  
13
163
 
*/

 

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