Is it possible to create a portable class library with Roslyn?

Question

This is very simple code that generates a referenced DLL from a portable class library, but it is error prone because when I add a link, it accepts non-portable links. How can I say for sure that what I'm trying to create is in the Portable profile ?, Here is the code:

using System.IO; using Roslyn.Compilers; using Roslyn.Compilers.CSharp; namespace Ros1 { class Program { static void Main(string[] args) { SyntaxTree tree = SyntaxTree.ParseText( @"using System; namespace HelloWorld { public class A { public int Sum(int a, int b) { return a + b; } } }"); var co = new CompilationOptions(OutputKind.DynamicallyLinkedLibrary); var compilation = Compilation.Create("HelloWorld", co) .AddReferences(MetadataReference.CreateAssemblyReference("mscorlib")) .AddSyntaxTrees(tree); using (var file = new FileStream("Sum.dll", FileMode.Create)) { compilation.Emit(file); } } } } 

Answer 1

Yes. Portable Class Libraries (PCL) as a concept is transparent to the compiler. This is mainly a function of the design system and reference assemblies. If you want to create a portable class library that is targeted at, say, .NET for Windows Store and .NET 4.5 applications, you must compile the assembly in this folder:

 %ProgramFiles(x86)%\Reference Assemblies\Microsoft\Framework\.NETPortable\v4.5\Profile\Profile7 

Each profile folder has a subdirectory called SupportedFrameworks, which indicates which framework it supports.

To make PCL work fine in Visual Studio, you must also enable TargetFrameworkAttribute . Make sure the version and profile are installed correctly. For the example above you will need

 [assembly: TargetFramework(".NETPortable,Version=v4.5,Profile=Profile7", FrameworkDisplayName=".NET Portable Subset")] 

I do not think that we are sending these assemblies outside of Visual Studio, so you will need to install Visual Studio 2010 (with the PCL extension installed) or Visual Studio 2012.

Answer 2

I believe Paulo asks if Roslyn can be used in a Silverlight / Portable application. The answer is no, Roslyn currently only works with complete confidence in the desktop CLR. This, of course, is what we would like to include in the future.