String Validator Full

StringValidator.cs

using System;

namespace ConsoleApp25
{
    class Program
    {
        static void Main(string[] args)
        {
            //This throws an exception from the constructor
            //var stringValidator = new StringValidator(null);

            var stringValidator1 = new StringValidator("First");
            var stringValidator2 = stringValidator1 with { InputString = "Second" };
            Console.WriteLine(stringValidator2.InputString);

            //This throws an exception from the init accessor
            //var stringValidator3 = stringValidator1 with { InputString = null };

            //Output: Second
        }
    }

    public record StringValidator
    {
        private string inputString;

        public string InputString
        {
            get => inputString;
            init
            {
                //This init accessor works like the set accessor
                ValidateInputString(value);
                inputString = value;
            }
        }

        public StringValidator(string inputString)
        {
            ValidateInputString(inputString);
            InputString = inputString;
        }

        public static void ValidateInputString(string inputString)
        {
            if (string.IsNullOrEmpty(inputString)) throw new ArgumentNullException(nameof(inputString));
        }
    }
}