LINQ let clause Example

using System;

using System.Linq;

using System.Collections.Generic;

namespace Console_LINQ_let_clause

{

    class LinqClauses

    {

        public void LinqExample01()

        {

            Console.WriteLine("\nLinqExample01");

            List<string> fullnames = new List<string>()

            {

                "Ajeet Kumar", "Rajeev Gupta", "Mohit Sharma", "Vinay Dubey",

                "Amit Gupta", "Mira Gupta", "Arvind Sharma", "Sagar Gupta"

            };

            //find all first names using LINQ

            var queryvar = from fullname in fullnames

                          select fullname.Split(' ')[0];

            //execute queryvar

            foreach (var item in queryvar)

            {

                Console.WriteLine(item);

            }

        }

        public void LinqExample02()

        {

            Console.WriteLine("\nLinqExample02");

            List<string> fullnames = new List<string>()

            {

                "Arjun Kumar", "Krishna Gupta", "Maya Sharma", "Bhim Dubey",

                "Nakul Gupta", "Radha Gupta", "Arvind Sharma", "Sagar Gupta"

            };

            //find all first names using LINQ

            /*

             * let clause is used to store the result of an expression 

             * let variable is new range variable

             * fullname is range variable which is replaced by firstname

             */

            var firstnames = from fullname in fullnames

                           let firstname = fullname.Split(' ')[0]

                           select firstname;

            //execute firstnames

            foreach (var first in firstnames)

            {

                Console.WriteLine(first);

            }

        }

    }

    class Program

    {

        static void Main(string[] args)

        {

            LinqClauses c = new LinqClauses();

            c.LinqExample01();

            c.LinqExample02();

            Console.ReadKey();

        }

    }

}

OUTPUT

LinqExample01

Ajeet

Rajeev

Mohit

Vinay

Amit

Mira

Arvind

Sagar

LinqExample02

Arjun

Krishna

Maya

Bhim

Nakul

Radha

Arvind

Sagar