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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


 







Output


=====================


2


4


6


8


10


 



 


Namoskar