Join Dotnetcodes DotnetCodes.com is online Discussion Forum for Software professionals . It lets you find friends around the world and Create professional network that share similar interests as you. Get help on ur projects by industry specialists. Also get answers to all ur technical/placement related querries.Get an edge over others.
Already MemberClick here to login
ASP.net MVC Interview Questions Answers Interview Questions
Get Started Developing for Android Apps with Eclipse Articles
Serial Number in SSRS Articles
.Net framework 4.0 Interview Questions Answers Interview Questions
SQL server reporting services Interview Questions (SSRS) part 1 Articles
Whats New in ASP.NET 4.0 Part 2 Articles
How to Print a Crystal Report direct to printer Articles
Difference between Encapsulation and Abstraction Interview Questions
Explaining SDLC -System Development Life Cycle Articles
Html5 interview questions and answers Interview Questions
SharePoint 2010 interview Questions Answers Interview Questions
Infosys Interview Questions Interview Questions
Dynamic Menu using HTML List Tag and CSS in ASP.Net Articles
Populate or bind Dropdownlist in Asp.net using Jquery and Json Articles
ASP.NET MVC Overview Interview Questions
Submit Articles | More Articles..

New features in C# 4.0

Posted By: rakesh On:8/4/2010 6:50:03 AM in:Articles Category:CSharp Hits:1565
In this Article I explain What is the new features in C# 4.0

Introduction

The major theme for C# 4.0 is dynamic programming. Increasingly, objects are “dynamic” in the sense that their structure and behavior is not captured by a static type, or at least not one that the compiler knows about when compiling your program. Some examples include

  1.          objects from dynamic programming languages, such as Python or Ruby
  2.          COM objects accessed through IDispatch
  3.          ordinary .NET types accessed through reflection
  4.         objects with changing structure, such as HTML DOM objects

While C# remains a statically typed language, we aim to vastly improve the interaction with such objects.

A secondary theme is co-evolution with Visual Basic. Going forward we will aim to maintain the individual character of each language, but at the same time important new features should be introduced in both languages at the same time. They should be differentiated more by style and feel than by feature set.

The new features in C# 4.0 fall into four groups:

Dynamic lookup

Dynamic lookup allows you to write method, operator and indexer calls, property and field accesses, and even object invocations which bypass the C# static type checking and instead gets resolved at runtime.

Named and optional parameters

Parameters in C# can now be specified as optional by providing a default value for them in a member declaration. When the member is invoked, optional arguments can be omitted. Furthermore, any argument can be passed by parameter name instead of position.

COM specific interop features

Dynamic lookup as well as named and optional parameters both help making programming against COM less painful than today. On top of that, however, we are adding a number of other small features that further improve the interop experience.

Variance

It used to be that an IEnumerable<string> wasn’t an IEnumerable<object>. Now it is – C# embraces type safe “co-and contravariance” and common BCL types are updated to take advantage of that.

In the next Part, I  will discuss in details of the above features.
comments powered by Disqus
User Profile
Rakesh Sinha
Sr. Technical Lead
New Delhi , India
Email :You must Log In to access the contact details.
Latest Post from :rakesh
Response.Redirect vs Server.Transfer
View: 436 | Submitted on: 12/27/2015 2:26:38 PM
The test form is only available for requests from the local machine.
View: 503 | Submitted on: 11/3/2015 9:54:36 PM
Difference between web service WCF and Web API
View: 5711 | Submitted on: 10/28/2015 9:23:51 PM
Which party you want to vote in Delhi assembly elections 2015?
View: 1496 | Submitted on: 12/18/2014 4:19:24 AM
How to Calculate sum of a column in a dataset
View: 1170 | Submitted on: 9/17/2014 6:48:19 AM
Submit Articles | All Post of This User..

All rights reserved to dotnetcodes. Logos, company names used here if any are only for reference purposes and they may be respective owner's right or trademarks.
Best viewed at 1024 x 768 resolution with Internet Explorer 5.0 or Mozila Firefox 3.5 or Google Crome and higher