Differences between various versions of .net Framework

What is .NET Framework?

　.NET Framework is also called .Net Framework. Developed by Microsoft, it is a software development platform dedicated to agile software development, rapid application development, platform independence and network transparency. .NET is Microsoft's first step toward server and desktop software engineering for the next decade. .NET contains many technologies that facilitate the rapid development of Internet and intranet applications.

　The .NET framework is Microsoft’s new development platform after Windows DNA. The .NET framework is a programming platform that runs on a system virtual machine. It is based on the Common Language Runtime and supports the development of multiple languages ​​(C#, VB, C++, Python, etc.).

　.NET also provides new features and development tools for application programming interfaces (APIs). These innovations allow programmers to develop Windows applications and network applications as well as components and services (web services) simultaneously. .NET provides a new reflective and object-oriented programming programming interface. .NET is designed to be general enough that many different high-level languages ​​can be brought together.

What versions of .NET Framework are there?

.NET Framework 1.0, .NET Framework 1.1, .NET Framework 2.0, .NET Framework 3.0, .NET Framework 3.5, .NET Framework 4.0.

Introduction to various versions of .net framework:

.NET Framework 1.0

　Full version number - 1.0.3705

This is the original .NET framework, released in 2002. It is available as a stand-alone and redistributable package or in a software development kit set. It was also part of the first Microsoft Visual Studio .NET release (also known as Visual Studio .NET 2002).

.NET Framework 1.1

　Full version number - 1.1.4322

　This is the first major .NET Framework upgrade version, released in 2003. It is available as a stand-alone redistributable package or in a software development kit set. It is also part of the second Microsoft Visual Studio .NET version (also known as Visual Studio .NET 2003). It is also the first version of the .NET framework built into the Windows operating system - Windows Server 2003.

　 Improvements since version 1.0:

　 Comes with support for mobile asp .net control. This was implemented as an add-on feature in version 1.0 and is now integrated into the framework. Security changes - Enable Windows Forms code to run with reliable behavior so that it can run safely within the Internet environment, and add code security access capabilities for ASP .NET applications. Comes with support for ODBC and Oracle databases. This was implemented as an add-on feature in version 1.0 and is now integrated into the framework. .NET Compact Framework - This is a subset of the .NET framework for smart devices (such as Pocket PC or SmartPhone). Support for IPv6. Lots of API changes.

.NET Framework 2.0

　Full version number - 2.0.50727.42, released on October 27, 2005.

　 .NET Framework 2.0 components are included in Visual Studio 2005 and SQL Server 2005. The RTM version can be downloaded for free through the MSDN Universe version.

Improvements since version 1.1:

Lots of API changes. The new API enables non-.NET applications that need to manage instances of the .NET runtime to do this. This new API provides good control over various functions of the .NET runtime, including multi-threading, memory allocation, code loading, etc. It was originally designed for Microsoft SQL Server to efficiently use the .NET runtime because Microsoft SQL Server has its own schedule manager and memory manager. NET Framework 2.0 SP1 is released at the same time as .NET Framework 3.5, please refer to the .NET Framework 3.5 section. .NET Framework 2.0 SP2 is released at the same time as .NET Framework 3.5 SP1. Please refer to the .NET Framework 3.5 SP1 section.

.NET Framework 3.0

Main article: .NET Framework 3.0

Published on 2006/11/21. Formerly known as "WinFX". Still using the common language runtime (CLR) of the .NET framework version 2.0, and adding 4 frameworks to adapt to future software development directions:

　 Windows Presentation Foundation (WPF): Provides a better user experience and is used to develop Windows Forms Programs and browser applications. Windows Communication Foundation (WCF): Provides a secure network service (Web Service) framework supported by SOA (service-oriented software architecture). Windows Workflow Foundation (WF): Provides an application programming interface with basic support for designing and developing workflow-oriented applications. Windows CardSpace: Provides an SSO solution, each user has their own CardSpace. .NET Framework 3.0 SP1 is released simultaneously with .NET Framework 3.5, please see .NET Framework 3.5. .NET Framework 3.0 SP2 is released at the same time as .NET Framework 3.5 SP1, please refer to .NET Framework 3.5 SP1.

.NET Framework 3.5

　This version will include a compiler that supports C# and VB .Net-centric language features, as well as support for Language-Integrated Query (LINQ). This version is released with Visual Studio 2008.
At the same time, .NET Framework 3.5 automatically includes .NET Framework 2.0 SP1 and .NET Framework 3.0 SP1 to provide security fixes for these two versions, as well as a small number of new class libraries (such as System.DateTimeOffest), this version provides The new features of are: Extension Method attributes (ATTRIBUTE), which are used to support LINQ support for expansion methods, including Linq to Object, Linq to Ado .NET, and Linq to XML expression directory tree (Expression Tree). , used to provide support for Lambda expressions tightly integrated with Language Integrated Query (LINQ) and Data Awareness. With this new feature, you can write code in any LINQ-enabled language using the same syntax to filter and enumerate many types of SQL data, collections, XML, and datasets, as well as create projections of them. Use ASP.NET AJAX to create more efficient, interactive, and highly personalized Web experiences that work on all the most popular browsers. New web protocol support for building WCF services, including AJAX, JSON, REST, POX, RSS, ATOM and several new WS-* standards. Complete tooling support for WF, WCF and WPF in Visual Studio 2008, including the new technology of workflow-enabled services. New classes in the .NET Framework 3.5 Base Class Library (BCL) address many common client requests. [edit] .NET Framework 3.5 SP1 .NET Framework 3.5 SP1 automatically includes .NET Framework 2.0 SP2 and .NET Framework 3.0 SP2. This version is released with Visual Studio 2008 SP1. This version provides the following new features:

The new ASP .NET features include ASP .NET dynamic data and ASP .NET AJAX additional features. The former provides the ability to implement without writing code. A rich scaffolding framework for data-driven rapid development that provides support for managing browser history (back button support). ADO .NET Entity Framework. Data provider support for SQL Server 2008. The .NET Framework client configuration document is a subset of the full .NET Framework, oriented to client applications. This improves the installation experience on computers that don't have the .NET Framework installed yet. Improved performance of Windows Presentation Foundation, including startup speed performance improvements for bitmap effects. Features added to Windows Presentation Foundation include better support for line-of-business applications, native splash screen support, DirectX pixel shader support, and a new WebBrowser control. ClickOnce application publishers can decide whether to cancel signing and hashing on a case-by-case basis, developers can programmatically install ClickOnce applications that display custom signatures, and ClickOnce error dialog boxes support links to application-specific support sites on the web. . The .NET Framework Data Provider for SQL Server (System.Data.SqlClient) fully supports all new features of the SQL Server 2008 database engine. For more information about the .NET Framework's support for SQL Server 2008, see What's New in SQL Server (ADO .NET). The ADO .NET Data Platform is a multi-versioning strategy that enables developers to program against a conceptual entity data model, easing their coding and maintenance efforts. This platform provides ADO .NET Entity Framework, Entity Data Model (EDM), Object Services, LINQ to Entities, Entity SQL, EntityClient, ADO .NET Data Services and Entity Data Model tools. Windows Communication Foundation now provides improved interoperability support, enhances the debugging experience in partial trust scenarios, and extends integrated protocol support for wider application to Web 2.0 applications, making the DataContract serializer easier to use . The Microsoft.VisualBasic.PowerPacks namespace introduces the new DataRepeater control, which displays data in a customizable list format. This namespace also contains new vector shapes.

.NET Framework 4.0

　.NET Framework 4.0 mainly adds parallel support. The English version was launched on April 12, 2010.

　Enterprise Foundation. NET provides an independent platform for software development, comes with a highly secure network system, and relies heavily on software components and component-oriented programs. In this regard it completely replaces the former (COM).

The .NET framework version has been upgraded to 3.5. However, the core part of .net framework 3.0 and 3.5 is still the same as .net2.0, but some class libraries are added on its basis. The following chart can clearly describe the differences between the three versions of the framework.

.net framework 2.0 = CLR 2.0 + FCL (framework class library)
.net framework 3.0 = .net framework 2.0 + SP1 + WPF + WCF + WF + CardSpace
.net framework 3.5 = .net framework 3.0 + SP2 + new compiler

The CLR of these three versions of the framework are all 2.0. Therefore, you will find that the runtime of asp.net is still only 1.1 and 2.0. New functions like Linq are actually only implemented with a new compiler and some new class libraries. Yes, version 3.5 does not make a major upgrade to the CLR.

　 VS2008 supports developing projects under three versions: 2.0, 3.0 and 3.5. VS2005 projects can be smoothly upgraded to VS2008. When doing VS2005 projects under VS2008, the compiler and class library used are the same as VS2005. But it provides a better development environment.