Operators and Expressions:Type operators:Is : Operator is as « Language Basics « C# / C Sharp

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Operators and Expressions:Type operators:Is

/*
A Programmer's Introduction to C# (Second Edition)
by Eric Gunnerson

Publisher: Apress  L.P.
ISBN: 1-893115-62-3
*/

// 14 - Operators and Expressions\Type operators\Is
// 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());
    }
}
           
       

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4.	Use is to avoid an invalid cast
5.	Demonstrate as
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