/* A Programmer's Introduction to C# (Second Edition) by Eric Gunnerson Publisher: Apress L.P. ISBN: 1-893115-62-3 */ // 14 - Operators and ExpressionsType operatorsIs // copyright 2000 Eric Gunnerson using System; interface IAnnoy { void PokeSister(string name); } class Brother: IAnnoy { public void PokeSister(string name) { Console.WriteLine("Poking {0}", name); } } class BabyBrother { } public class TypeoperatorsIs { public static void AnnoyHer(string sister, params object[] annoyers) { foreach (object o in annoyers) { if (o is IAnnoy) { IAnnoy annoyer = (IAnnoy) o; annoyer.PokeSister(sister); } } } public static void Main() { TestoperatorsIs.AnnoyHer("Jane", new Brother(), new BabyBrother()); } }