C# double dispatch example

double_dispatch_example.cs

    internal class Program
    {
        public interface IVisitor
        {
            void MethodA(object param);

            void MethodA(string param);
        }

        public class VisitorA : IVisitor
        {
            public void MethodA(object param)
            {
                Console.WriteLine("VisitorA object");
            }

            public void MethodA(string param)
            {
                Console.WriteLine("VisitorA string");
            }
        }

        public class VisitorB : IVisitor
        {
            public void MethodA(object param)
            {
                Console.WriteLine("VisitorB object");
            }

            public void MethodA(string param)
            {
                Console.WriteLine("VisitorB string");
            }
        }

        private static void Main()
        {
            IVisitor visitor = new VisitorB();

            object param = "123";
            visitor.MethodA(param); // VisitorB object

            Console.ReadKey();
        }
    }