Does C# 6.0 Work for .Net 4.0

Does C# 6.0 work for .NET 4.0?

Yes (mostly). C# 6.0 requires the new Roslyn compiler, but the new compiler can compile targeting older framework versions. That's only limited to new features that don't require support from the framework.

For example, while you can use the string interpolation feature in C# 6.0 with earlier versions of .Net (as it results in a call to string.Format):

int i = 3;
string s = $"{i}";

You need .Net 4.6 to use it with IFormattable as only the new framework version adds System.FormattableString:

int i = 3;
IFormattable s = $"{i}";

The cases you mentioned don't need types from the framework to work. So the compiler is fully capable of supporting these features for old framework versions.

Is there a way to use C# 6 or higher in .NET 4?

The language-version only relies on the version of Visual Studio. To use features intorduced in C#6 you need at least VS2015. This has nothing to do with the installed .NET-framework-version. In fact you can use VS2015 and its compiler-features (e.g. auto-implemented properties with an initial value) and compile against .Net 2.0:

int MyProperty { get; set; } = -1;

To change the target-framework (e.g. .Net 2.0) use Project properties-->Application-->Target framework.

To change the language version via Project properties-->Build-->Advanced-->Language version.

Let´s consider the following example: Beginning with C#3 you can write the following:

var a = new { MyProperty = 1 };

This compiles for any .Net-version. However the most common use-case for anonymous types is when using Linq to fetch data from a database. Linq was introuced in framework-version 3.5 and heavily depends on lambda-expressions and extension-methods, which both were introduced in C#3:

var result = myCollection.Select(x => new { MyProperty = x.MyProperty });

So although you could use anonymous types in earlier versions of the framework, there was little need to do so.

To get a better view on the difference between the C#- (=language)-version and the framework-version read this post. This thread on the other side lists the language-versions and in which version of VS they were released.

C#6 expression in .net framework 4

This syntax is called Expression-bodied function members. It is equivalent to called ProxyQueueTimeoutMs property with a getter that returns after => part like;

private int ProxyQueueTimeoutMs
{
   get 
   { 
       return ((MultiProxyCrawlConfiguration) _config).ProxyQueueTimeoutMs;
   }
}

Use Entity Framework 6.0 in .net 4.0 application (wpf)

Yes you can access all the features of Entity Framework 6 while using .NET 4.

Read this for complete information:

Link

Does Entity Framework 6 support .NET 4.0?

Entity Framework 6 does support .NET 4.0. You should update your version of NuGet then try again. You can find the download at http://www.nuget.org/. I successfully downloaded EntityFramework 6.0.0-rc1 from the main nuget.org feed from an application targeting .NET 4.0

Why does VS2015 allow C# 6.0 functions for .Net 4.5.2 applications?

C# 6 is a new version of language C#, it has nothing to do with .NET Framework version. So you can use C# 6 even with old version's of .NET. Roslyn compiler is a new compiler that is shipped with VS2015, but could be installed on older versions of VS as standalone. So basically Roslyn compiles the new features for you, regardless the framework version you are using.

What CLR is needed for C# 6?

C # 6 language enhancements is compatible to .net framework starting from 2.0 to 4.6. It does not require any higher version of .net framework but need higher version of Visual studio such as VS 2015. C# 6 is also available to VS 2013 with addon https://github.com/dotnet/roslyn

Roslyn and .NET Runtime version

The new C# 6.0 features don't depend upon framework support so yes, you an app compiled with the C# 6.0 compiler will run on .NET 4.0, assuming of course you specify you are targeting .NET 4.0 in your project file in the first place.

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