LINQ: Query vs Lambda Expression

LINQ is not just for the developers who used to write queries for databases but also for the Functional Programmers. So do not worry if you are not very comfortable with SQL kind of queries, we have a very nice option called “Lambda Expression”. Here I am going to demonstrate the scenario for both the options with a small example. This example has an array of integers and I am only retrieving the even numbers using the power of LINQ. Here we go

using System;

using System.Collections.Generic;

using System.Text;

using System.Query;

using System.Xml.XLinq;

using System.Data.DLinq;

namespace LINQConsoleApplication1

{

    class Program

    {

        static void Main(string[] args)

        {

            int[] arrInt = {1,2,3,4,5,6,7,8,9,10};

            #region Place to change

            //Language Integrated Query

            var aa = from s in arrInt

                     where s % 2 == 0

                     select s;

            #endregion

            foreach (var item in aa)

            {

                Console.WriteLine("{0}", item);

            }

            Console.ReadKey();

        }

    }

}

If you do not want to use the different approach of query for Language then you are free to use Lambda Expression. So just replace the #region area with the following code block results will be identical.

            #region Place to change

            //Lambda Expression

            var aa = arrInt.Where(s => s % 2 == 0);

            #endregion

Output will look like

Namoskar