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

namespace ConsoleApplication4
{
    class Program
    {
        public List<int> prepareListOfValues()
        {
            List<int> list = new List<int>();
            for (int i = 0; i < 10; i++)
            {
                list.Add(i);
            }
            return list;
        }

        //LAMBDA
        public void LambdaExpression()
        {
            var result = from r in
                             Enumerable.Range(1, 10).Where(num => num % 2 == 0)
                         select r;
            foreach (var r in result)
            Console.WriteLine(r);
            Console.ReadKey(true);
        }

        //metoda anonimowa
        public void AnonymouMethod()
        {
            var result = from r in
            Enumerable.Range(1, 10).Where(delegate(int number)
             {
             if (number % 2 == 0)
                 return true;
                 return false;
             })
            select r;
            foreach (var r in result)
            Console.WriteLine(r);
            Console.ReadKey(true);
        }


        //predicate
        public void Predicate()
        {
             var result = from r in
                     Enumerable.Range(1, 10).Where(GetOdd)
                     select r;
            foreach (var r in result)
            Console.WriteLine(r);
            Console.ReadKey(true);
        }
        static bool GetOdd(int number)
        {
            if (number % 2 == 0)
                return true;
            else
                return false;
        }

        static void Main(string[] args)
        {
            Program pr = new Program();
            pr.LambdaExpression();
            pr.AnonymouMethod();
            pr.Predicate();
        }
    }
}