ProgramGood.Net

Thanks to:
http://davidhayden.com/blog/dave/archive/2006/05/28/2974.aspx

Anon methods, delegates, predicates.  Anon methods are simple shortcuts so don't have to declare a predicate method.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace TestAnonymousMethods
{
    public class Program
    {
        // using an anon method
        static void Mainx(string[] args)
        {
            int[] _integers = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };

            int[] evenIntegers = Array.FindAll(_integers,
                                        // this is the anonymous method below
                                       delegate(int integer)
                                       {
                                           return (integer % 2 == 0);
                                       }
                );

            foreach (int integer in _integers) 
                Console.WriteLine(integer);

            foreach (int integer in evenIntegers)
                Console.WriteLine(integer);
        }

        // not using anon method
        static void Mainy(string[] args)
        {
            int[] _integers = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };

            // passing in IsEven..a delegate which represents the IsEven method
            int[] evenIntegers = Array.FindAll(_integers, IsEven);

            foreach (int integer in _integers)
                Console.WriteLine(integer);

            foreach (int integer in evenIntegers)
                Console.WriteLine(integer);
        }

        static bool IsEven(int integer)
        {
            return (integer % 2 == 0);
        }


       
        // not using anon method and looking at predicate / delegate of Array.FindAll
        static void Main(string[] args)
        {
            int[] _integers = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
            // a predicate is expected
            // passing in IsEven..a delegate which represents the IsEven method
            int[] whatIsInBoth = Array.FindAll(_integers, IsDaveSequence);

            foreach (int integer in whatIsInBoth)
                Console.WriteLine(integer);

        }

        static bool IsDaveSequence(int integer)
        {
            bool returnState = false;
            if ((integer == 1) || (integer == 3) || (integer ==4))
                returnState = true;
            return returnState;
        }



    }
}