Kód v c#:

using System;
using System.Linq;
namespace Projectik.eu
{
    class Program
    {
        static void Main(string[] args)
        {
            // An input data array.
            int[] array = {1,2,3,4,5};
           
            // ... The Select method changes each element in the result.
            var result = array.Select(element => element.ToString());
            // Display the result.
            foreach (string value in result)
            {
                Console.WriteLine(value);
            }
            Console.ReadKey();
        }
    }
}

Output :

1 2 3 4 5

Teraz urobíme opačný proces. Prevedieme pole stringov na pole čísel (string[] -> int[])

Kód v c# :

using System;
using System.Linq;
namespace Projectik.eu
{
    class Program
    {
        static void Main(string[] args)
        {
            // An input data array.
            string[] array = { "1", "2", "3", "4", "5", };
           
            // ... The Select method changes each element in the result.
            var result = array.Select(element => Convert.ToInt32(element));
            // Display the result.
            foreach (int value in result)
            {
                Console.WriteLine("{0}",value);
            }
            Console.ReadKey();
        }
    }
}

Output :

1 2 3 4 5

Pomocou metódy Where v C# filtrujeme určité prvky pola. Môžeme ju použiť v rôznych "collection types".
V prvom príklade si ukážeme, ako vybrať iba členov, ktorí maju vek nad 10 rokov. V druhom príklade si ukážeme použite v kombinácii s metódou select a vyberieme iba mena užívateľov s vekom nad 10 rokov.

Kód v c#:

using System;
using System.Linq;
using System.Collections.Generic;
namespace Projectik.eu
{
    class member
    {
        public member(string name,int age)
        {
            this.Name = name;
            this.Age = age;
        }
        public string Name {get;set; }
        public int Age{get;set;}
    }
    class Program
    {
        static void Main(string[] args)
        {
            // An input data array.
            List<member> myList = new List<member>();
            //Add to list
            myList.Add(new member("Ferko", 15));
            myList.Add(new member("Jarko", 6));
            myList.Add(new member("Lucka", 12));
           
            // ... The Where method find each element > 10
            var result =myList.Where(member1 => member1.Age > 10);
            // Display the result.
            foreach (member value in result)
            {
                Console.WriteLine("{0}",value.Name);
            }
            Console.ReadKey();
        }
    }
}

Output :

Ferko
Lucka

Kód v c#:

using System;
using System.Linq;
using System.Collections.Generic;
namespace Projectik.eu
{
    class member
    {
        public member(string name,int age)
        {
            this.Name = name;
            this.Age = age;
        }
        public string Name {get;set; }
        public int Age{get;set;}
    }
    class Program
    {
        static void Main(string[] args)
        {
            // An input data array.
            List<member> myList = new List<member>();
            //Add to list
            myList.Add(new member("Ferko", 15));
            myList.Add(new member("Jarko", 6));
            myList.Add(new member("Lucka", 12));
           
            // ... The Where method find each element > 10 && only Name
            var result = myList.Where(member1 => member1.Age > 10).Select(member1 => member1.Name);
            // Display the result.
            foreach (string value in result)
            {
                Console.WriteLine("{0}",value); //change !!!
            }
            Console.ReadKey();
        }
    }
}

Output :

Ferko
Lucka

Kód v c# :

using System;
using System.Linq;
using System.Collections.Generic;
namespace Projectik.eu
{   
    class Program
    {
        static void Main(string[] args)
        {
            //
            // input array 
            //
            string[] array = { "jarko", "lucka", "ferko","projectik" };
            //
            // Use Where method
            //
            var result1 = array.Where(item => item.Contains("a"));
            foreach (string value in result1)
            {
                Console.WriteLine(value);
            }
          
            Console.ReadKey();
        }
    }
}

Output :

Jarko
Lucka