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C# 4.0 is a version of the C# programming language that was released on April 11, 2010. Microsoft released the 4.0 runtime and development environment Visual Studio 2010 . [ 1 ] The major focus of C# 4.0 is interoperability with partially or fully dynamically typed languages and frameworks, such as the Dynamic Language Runtime and COM .
On 19 October 2009, Microsoft released Beta 2 of the .NET Framework 4. [68] At the same time, Microsoft announced the expected launch date for .NET Framework 4 as 22 March 2010. [68] This launch date was subsequently delayed to 12 April 2010. [69] On 10 February 2010, a release candidate was published: Version:RC. [70]
Traditionally, .NET apps targeted a certain version of a .NET implementation, e.g. .NET Framework 4.6. [ 5 ] [ 6 ] Starting with the .NET Standard, an app can target a version of the .NET Standard and then it could be used (without recompiling) by any implementation that supports that level of the standard.
Template:.NET Framework version history. 3 languages. ... [2] [3] [4] Version CLR Release date Support ended [5] [6] Visual Studio Included in Can be installed on ...
List comprehension – C# 3 LINQ; Tuples – .NET Framework 4.0 but it becomes popular when C# 7.0 introduced a new tuple type with language support [104] Nested functions – C# 7.0 [104] Pattern matching – C# 7.0 [104] Immutability – C# 7.2 readonly struct C# 9 record types [105] and Init only setters [106]
NHibernate 2.0 was released on August 23, 2008. It is comparable to Hibernate 3.2 in terms of features. With the version 2.0 release, NHibernate dropped support for .NET 1.1. [4] NHibernate 2.1 was released July 17, 2009.
As a precursor to the lambda functions introduced in C# 3.0, C#2.0 added anonymous delegates. These provide closure-like functionality to C#. [3] Code inside the body of an anonymous delegate has full read/write access to local variables, method parameters, and class members in scope of the delegate, excepting out and ref parameters. For example:-
In November 2009, Microsoft released the source code of the Micro Framework to the development community as free and open-source software under the Apache License 2.0. [ 9 ] In January 2010, Microsoft launched the netmf.com community development site to coordinate ongoing development of the core implementation with the open-source community.