.net Core amd Roslyn CSharpCompilation, The type 'Object' is defined in an assembly that is not referenced

Question

I'm trying to port some .net code to the new Core runtime and I'm having a bad time porting some on-the-fly compilation.

To resume, it always asks me for a reference to System.Runtime and mscorlib, but have no clue on how to reference them.

As a side note, I can't reference Framework 4.6 as the project must be published to a Linux machine with .net Core.

This is the minimum code:

        string testClass = @"using System; 
        namespace test{

         public class tes
         {

           public string unescape(string Text)
          { 
            return Uri.UnescapeDataString(Text);
          } 

         }

        }";

        var compilation = CSharpCompilation.Create(Guid.NewGuid().ToString() + ".dll")
            .WithOptions(new CSharpCompilationOptions(Microsoft.CodeAnalysis.OutputKind.DynamicallyLinkedLibrary))
            .AddReferences(
            MetadataReference.CreateFromFile(typeof(Object).GetTypeInfo().Assembly.Location),
            MetadataReference.CreateFromFile(typeof(Uri).GetTypeInfo().Assembly.Location)
            )
            .AddSyntaxTrees(CSharpSyntaxTree.ParseText(testClass));

        var eResult = compilation.Emit("test.dll");

It always complains about the need of mscorlib (in this example) and System.Runtime (in my real project).

I'm using the Microsoft.CodeAnalysis.CSharp package version 2.0.0-beta3

Any ideas on how to compile on the fly with Roslyn and .net Core?

Answer 1

Ok, got it finally working:

    string testClass = @"using System; 
    namespace test{

     public class tes
     {

       public string unescape(string Text)
      { 
        return Uri.UnescapeDataString(Text);
      } 

     }

    }";

    var dd = typeof(Enumerable).GetTypeInfo().Assembly.Location;
    var coreDir = Directory.GetParent(dd);

    var compilation = CSharpCompilation.Create(Guid.NewGuid().ToString() + ".dll")
        .WithOptions(new CSharpCompilationOptions(Microsoft.CodeAnalysis.OutputKind.DynamicallyLinkedLibrary))
        .AddReferences(
        MetadataReference.CreateFromFile(typeof(Object).GetTypeInfo().Assembly.Location),
        MetadataReference.CreateFromFile(typeof(Uri).GetTypeInfo().Assembly.Location),
        MetadataReference.CreateFromFile(coreDir.FullName + Path.DirectorySeparatorChar + "mscorlib.dll"),
        MetadataReference.CreateFromFile(coreDir.FullName + Path.DirectorySeparatorChar + "System.Runtime.dll")
        )
        .AddSyntaxTrees(CSharpSyntaxTree.ParseText(testClass));

    var eResult = compilation.Emit("test.dll");

I don't like it because the hardcoding, but it seems it's the only way to get it work.