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I'm trying to compile a standalone C# file using the Microsoft.CSharp.CSharpCodeProvider in mscorlib version 4.

It's complaining about properties that are using expression bodies instead of statement bodies.

I.e., this it will compile:

protected Foo MyFoo
    get { return this.myFoo; }
But this it won't:
protected Foo MyFoo => this.myFoo;
Is there a more recent version of mscorlib I should be using?
                Pretty sure CSharpCodeProvider is severely deprecated.  You should probably look to a roslyn based solution.
– Kirk Woll
                Dec 14, 2017 at 23:29
                System.CodeDom always uses the installed version of the framework and uses the C# compiler that is stored in the framework directory (normally c:\windows\microsoft.net\framework\v4.0.30319).  Just type "csc.exe" from the command line, it explicitly tells you which C# version it supports in its sign-on message.  That still doesn't say anything about the version on your user's machine.  But assuming you target at least 4.5 in your project, that will always be C# version 5.  Feature, not a bug, you don't have to worry about deploying Roslyn to the user's machine.   There is a Nuget package.
– Hans Passant
                Dec 14, 2017 at 23:33
        
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