C＃|版本记录

C＃是通用的，现代且面向对象的编程语言，发音为“ C Sharp”。它是由Anders Hejlsberg和他的团队在.NET倡议下由Microsoft开发的，并得到了欧洲计算机制造商协会(ECMA)和国际标准组织(ISO)的批准。 C＃的当前版本是C＃7.3 。

下表显示了每个C＃版本中引入的一些重要功能：

Version	.NET Framework	Visual Studio	Major Features
C# 1.0	.NET Framework 1.0	Visual Studio .NET 2002	Classes Structs Interfaces Events Properties Delegates Expressions Statements Attributes Literals
C# 1.2	.NET Framework 1.1	Visual Studio .NET 2003	Basic features
C# 2.0	.NET Framework 2.0	Visual Studio 2005	Generics Partial types Anonymous methods Nullable types Iterators Covariance and contravariance Method group conversions (delegates) Static classes Delegate inference Getter/setter separate accessibility
C# 3.0	.NET Framework 2.0/3.0/3.5	Visual Studio 2008/2010	Auto-implemented properties Anonymous types Query expressions Lambda expressions Expression trees Extension methods Implicitly typed local variables Partial methods Object and collection initializers
C# 4.0	.NET Framework 4	Visual Studio 2010	Dynamic binding Named/optional arguments Generic covariant and contravariant Embedded interop types
C# 5.0	.NET Framework 4.5	Visual Studio 2012/2013	Asynchronous members Caller info attributes
C# 6.0	.NET Framework 4.6	Visual Studio 2015	Static imports Exception filters Auto-property initializers Expression bodied members Null propagator String interpolation nameof operator Index initializers Await in catch/finally blocks Default values for getter-only properties
C# 7.0	.NET Framework 4.6.2	Visual Studio 2017	Out variables Tuples and deconstruction Pattern matching Local functions Expanded expression bodied members Ref locals and returns Discards Binary Literals and Digit Separators Throw expressions
C# 7.1	.NET Framework 4.7	Visual Studio 2017 version 15.3	async Main method default literal expressions Inferred tuple element names Pattern matching on generic type parameters
C# 7.2	.NET Framework 4.7.1	Visual Studio 2017 version 15.5	Techniques for writing safe efficient code Non-trailing named arguments Leading underscores in numeric literals private protected access modifier Conditional ref expressions
C# 7.3	.NET Framework 4.7.2	Visual Studio 2017 version 15.7	You can access fixed fields without pinning. You can reassign ref local variables. You can use initializers on stackalloc arrays. You can use fixed statements with any type that supports a pattern. You can use additional generic constraints.
C# 8.0	.NET Core 3.0/.NET Standard 2.1	Visual Studio 2019 version 16.3	Readonly members Default interface methods Pattern matching enhancements Switch expressions Property patterns Tuple patterns Positional patterns Using declarations Static local functions Disposable ref structs Nullable reference types Asynchronous streams Indices and ranges Null-coalescing assignment Unmanaged constructed types Stackalloc in nested expressions Enhancement of interpolated verbatim strings

参考：

• https://zh.wikipedia.org/wiki/C_Sharp_(programming_language)#Versions
• https://docs.microsoft.com/zh-cn/dotnet/csharp/whats-new/csharp-version-history