C # Language history version features (C # 1.0 to C # 7.1 rollup update)

Historical Version

C # as Microsoft 2000 later. NET platform development of the language, the development has been 17 years of history, the language itself has a wealth of characteristics, Microsoft's support for its update is also very supportive. Microsoft has submitted C # to the standard organization Ecma,c# 5.0 is currently the latest specification for ECMA release, C # 6.0 is a draft phase, and C # 7.1 is the latest specification that Microsoft is currently offering.

This is just an outline, because C # 5.0 is a version with the ECMA standard specification, so choose C # 5.0 as the major version and learn the new features of C # 6.0, 7.0.

C # Language Specification GitHub library See also: Https://github.com/dotnet/csharplang

C # language Roadmap and features in development see:
Https://github.com/dotnet/roslyn/blob/master/docs/Language%20Feature%20Status.md

language version	Release Time	. NET Framework Requirements	Visual Studio Version
C # 1.0	2002.1	. NET Framework 1.0	Visual Studio. NET 2002
C # 1.1\1.2	2003.4	. NET Framework 1.1	Visual Studio. NET 2003
C # 2.0	2005.11	. NET Framework 2.0	Visual Studio 2005
C # 3.0	2007.11	. NET Framework 2.0\3.0\3.5	Visual Studio 2008
C # 4.0	2010.4	. NET Framework 4.0	Visual Studio 2010
C # 5.0	2012.8	. NET Framework 4.5	Visual Studio 2012\2013
C # 6.0	2015.7	. NET Framework 4.6	Visual Studio 2015
C # 7.0	2017.3	. NET Framework 4.6.2	Visual Studio 2017
C # 7.1	2017.6	. NET Framework	Visual Studio v15.3 Preview version
C # 8.0	Pending release

C # 1.0 features

The 1th version, the most basic feature of the programming language.

• Classes: Object-oriented features, supporting class types
• STRUCTS: Structure
• Interfaces: interface
• Events: Event
• Properties: A member of a class that provides a flexible way to access fields
• Delegates: Delegate, a reference type that represents a reference to a method with a specific argument list and return type
• Expressions,statements,operators: expressions, statements, operators
• Attributes: An attribute that adds metadata or declarative information to a program code, which can be accessed by reflection at run time
• Literals: literal (or understood as a constant value), distinguishing constants, constants are relative to variables

C # 2 features (VS 2005)

• Generics: Generics
• Partial types: Partial types, which can split type definitions of classes, structs, interfaces, etc. into multiple files
• Anonymous methods: Anonymous method
• Iterators: iterators
• Nullable types: Nullable type, the class can be a different value, or null
• Getter/setter Separate accessibility: Property access control
• Method group conversions (delegates): Methods set conversions, which can represent a set of methods in a declaration delegate, implicitly invoking the
• Co-and Contra-variance for delegates and interfaces: Covariance and contravariance of delegates, interfaces
• Static classes: Statically class
• Delegate inference: Delegate inference, allowing method names to be directly assigned to delegate variables

C # 3 features (VS.)

• Implicitly typed Local variables:
• Object and collection initializers: Objects and collection initializers
• auto-implemented properties: Automatic attributes, automatic attribute generation method, more concise declaration
• Anonymous types: Anonymous Type
• Extension methods: Extension method
• Query expressions: Querying expressions
• Lambda EXPRESSION:LAMBDA Expression
• Expression trees: Expressions tree, a tree-shaped data structure representing code, is a new type of data
• Partial methods: Partial Methods

C # 4 features (VS)

• Dynamic binding: Dynamically bound
• Named and optional arguments: named parameters and Optional parameters
• Generic Co-and contravariance: Covariance and contravariance of generics
• Embedded Interop Types ("Nopia"): Enables embedding type information to increase the neutrality of referencing COM component programs

C # 5 features (VS.)

• Asynchronous methods: Async method
• Caller Info attributes: Caller information attribute, Access caller's information when invoking

C # 6 features (VS)

• Compiler-as-a-service (Roslyn)
• Import of static type member into namespace: supports only static members in the Import class
• Exception Filters: Exception filter
• Await in catch/finally blocks: supports using await statements in catch/finally statement blocks
• Auto Property Initializers: Automatic attribute initialization
• Default values for Getter-only properties: Set defaults for read-only attributes
• Expression-bodied members: Support for member methods and read-only properties that are subject to an expression
• Null propagator (null-conditional operator, succinct null checking): null condition operator
• String interpolation: A new method for generating a specific format string by inserting strings
• nameof operator:nameof operator, returns the name of the method, property, variable
• Dictionary initializer: Dictionary initialization

C # 7 features (Visual Studio)

• Out variables:out variables are directly declared, for example, can be out-in parameter
• Pattern matching: schema matching, distributed according to object type or other attribute implementation method
• Tuples: Tuples
• Deconstruction: meta-group parsing
• Discards: No named variable, only placeholder, the following code does not need to use its value
• Local Functions: Partial function
• Binary literals: binary literal
• Digit Separators: Number separator
• REF returns and locals: reference return value and local variable
• Generalized use of generic return types in Async return Types:async
• More Expression-bodied members: Allows constructors, parsers, properties to use expressions as body
• The Throw Expressions:throw can be used in an expression

C # 7.1 features (Visual Studio version 15.3)

• Async main: In the Main method in async mode
• Default expressions: Introducing a new literal value default
• Reference assemblies:
• Inferred tuple element Names:
• Pattern-matching with generics:

C # Language history version features (C # 1.0 to C # 7.1 rollup update)