Null Object Example

Program.cs

#nullable enable

namespace NullObjectExample
{
    class Program
    {
        static void Main()
        {
            var someService = new SomeService();
        }
    }

    public class SomeService
    {
        private readonly IPerformsAction performsAction;

        public SomeService(IPerformsAction? performsAction = null)
        {
            this.performsAction = performsAction ?? NullActionPerformer.Instance;
        }
    }

    public interface IPerformsAction
    {
        void PerformAction();
    }

    public class NullActionPerformer : IPerformsAction
    {
        public static NullActionPerformer Instance { get; } = new NullActionPerformer();

        public void PerformAction()
        {
        }
    }
}