Func Delegate

Func Delegate

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Its a generic delegate.Is is symbolised by Func<T,TResult> . depending on the type paramemters (T and TResult) can be replaced with the corresponding type arguments
Func<Employee,string> specifies that it accepts Employee object and returns string object. Both Func<T,TResult> and lambda expression are similar things and differs only in sysntax.

Below is  a code snippet with Func<T,TResult>
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using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

namespace Indexers2

{

    public class Employee

    {

        public int EmployeeId { get; set; }

        public string EmployeeName { get; set; }

    }

    public partial class _Default : Page

    {

        List<Employee> employeelst;

        protected void Page_Load(object sender, EventArgs e)

        {

            employeelst = new List<Employee>();

            employeelst.Add(new Employee() { EmployeeId = 1, EmployeeName = "XXXX" });

            employeelst.Add(new Employee() { EmployeeId = 2, EmployeeName = "YYYY" });

            employeelst.Add(new Employee() { EmployeeId = 3, EmployeeName = "ZZZZ" });

           Func<Employee, string> selector = employee => "Name=" + employee.EmployeeName;

            IEnumerable<string> str= employeelst.Select(selector);

            foreach (string str_ in str)

            {

                Response.Write(str_);

                Response.Write("<br/>");

            }

           

           

        }

    }

}

Below is  a code snippet with Lambda expression
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using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

namespace Indexers2

{

    public class Employee

    {

        public int EmployeeId { get; set; }

        public string EmployeeName { get; set; }

    }

    public partial class _Default : Page

    {

        List<Employee> employeelst;

        protected void Page_Load(object sender, EventArgs e)

        {

            employeelst = new List<Employee>();

            employeelst.Add(new Employee() { EmployeeId = 1, EmployeeName = "XXXX" });

            employeelst.Add(new Employee() { EmployeeId = 2, EmployeeName = "YYYY" });

            employeelst.Add(new Employee() { EmployeeId = 3, EmployeeName = "ZZZZ" });

            //Func<Employee, string> selector = employee => "Name=" + employee.EmployeeName;

            IEnumerable<string> str= employeelst.Select(n=> "Name ="+n.EmployeeName);

            foreach (string str_ in str)

            {

                Response.Write(str_);

                Response.Write("<br/>");

            }

           

           

        }

    }

}