简单的来说：
VS2010 最高用到 .Net Framework4，C# 4.0
VS2015 最高用到 .Net Framework4.6，C# 6.0
VS2017 最高用到 .Net Framework4.7.2，C# 7.3
These are the versions of C# known about at the time of this writing:
- C# 1.0 released with .NET 1.0 and VS2002 (January 2002)
- C# 1.2 (bizarrely enough); released with .NET 1.1 and VS2003 (April 2003). First version to call
DisposeonIEnumerators which implementedIDisposable. A few other small features. - C# 2.0 released with .NET 2.0 and VS2005 (November 2005). Major new features: generics, anonymous methods, nullable types, iterator blocks
- C# 3.0 released with .NET 3.5 and VS2008 (November 2007). Major new features: lambda expressions, extension methods, expression trees, anonymous types, implicit typing (
var), query expressions - C# 4.0 released with .NET 4 and VS2010 (April 2010). Major new features: late binding (
dynamic), delegate and interface generic variance, more COM support, named arguments, tuple data type and optional parameters - C# 5.0 released with .NET 4.5 and VS2012 (August 2012). Major features: async programming, caller info attributes. Breaking change: loop variable closure.
- C# 6.0 released with .NET 4.6 and VS2015 (July 2015). Implemented by Roslyn. Features: initializers for automatically implemented properties, using directives to import static members, exception filters, element initializers,
awaitincatchandfinally, extensionAddmethods in collection initializers. - C# 7.0 released with .NET 4.7 and VS2017 (March 2017) Major new features: tuples, ref locals and ref return, pattern matching (including pattern-based switch statements), inline
outparameter declarations, local functions, binary literals, digit separators, and arbitrary async returns. - C# 7.1 released with VS2017 v15.3 (August 2017) New features: async main, tuple member name inference, default expression, pattern matching with generics.
- C# 7.2 released with VS2017 v15.5 (November 2017) New features: private protected access modifier, Span<T>, aka interior pointer, aka stackonly struct, everything else.
- C# 7.3 released with VS2017 v15.7 (May 2018). New features: enum, delegate and
unmanagedgeneric type constraints.refreassignment. Unsafe improvements:stackallocinitialization, unpinned indexedfixedbuffers, customfixedstatements. Improved overloading resolution. Expression variables in initializers and queries.==and!=defined for tuples. Auto-properties' backing fields can now be targeted by attributes. - C# 8.0 currently in preview. Expected new features: Non-nullable reference-types,
IAsyncEnumerable<T>support, Ranges, and default interface methods.