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New Message on BDOTNET
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From: Anand_2004
Message 1 in Discussion
Hi Folks In today's session I am talking about Lambda Expression . This is a
very interesting feature of C# 3.0.This is more sophisticated and provide
more functional programming benefit as compare to anonymous methods ,anonymous
method is one of the major enhancements in C# 2.0 its is nothing but a
nameless method used anywhere a delegate type is expected .Lambda expression
is the advance version of anonymous. Some basic feature of Lambda expression is
it written as a parameter list, followed by the => symbol, for example (int
lambdaExp) => lambdaExp +1; This is not hard and fast rule that we must
specify the type in parameter list , if you specify the type then its called
as explicit parameter list and if you do not specify the type then itÂ’s called
as implicit parameter list for example lambdaExp => lambdaExp +1; Below
code snippet demonstrate how to use lambda expression , in this example I am
trying to display the person name whose length is greater than 4
using System;
using System.Collections.Generic;
using System.Text;
using System.Query;
using System.Xml.XLinq;
using System.Data.DLinq; namespace lamdaexpression
{
class Program
{
static void Main(string[] args)
{
var friendList = new List<string>();
friendList.Add("Anand");
friendList.Add("Arun");
friendList.Add("Sudha");
friendList.Add("Anjana");
friendList.Add("Sasi");
friendList.Add("Pratap");
friendList.Add("Jani"); var newList =
friendList.FindAll( nameLen => nameLen.Length>4); foreach (string
name in newList)
{
Console.WriteLine(name);
}
Console.ReadLine();
}
}
}
You can specify more then one expression in the parameter list some of the code
benefits of Lambda expression are 1. Lambda expression allows explicitly and
impiety parameter list unlike anonymous method expects a explicitly type
2. The implementation ( body part) of lambda expression can be a piece of code
or a expression .
3. Lambda expressions with an expression body can be converted to expression
trees.Expression tree is provide the facility to treat lambda expressions as
data .This helps you to implement extension method ( will discuss about it in
my next post ) .
Cheers Anand https://anandkumar2004.wordpress.com
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