当引用的程序集引用mscorlib 2.0.5.0和4.0.0.0时，如何让roslyn编译

Question

I'm dynamically building a class that uses Microsoft.OData.Client this library have references to both mscorlib 2.0.5.0 (i guess the PCL) and 4.0.0.0.

I want to compile my class with roslyn, as part of a larger program, but I can't seem to get it to work. My Roslyn compiler code is pretty minimalistic

SyntaxTree syntaxTree = CSharpSyntaxTree.ParseText(s);
            string assemblyName = Path.GetRandomFileName();

            List<MetadataReference> references = new List<MetadataReference>()
            {
                MetadataReference.CreateFromFile(typeof(DataServiceActionQuery).Assembly.Location),
                MetadataReference.CreateFromFile(typeof(ODataAction).Assembly.Location),
                MetadataReference.CreateFromFile(typeof(GeneratedCodeAttribute).Assembly.Location),
                MetadataReference.CreateFromFile(typeof(IEdmModel).Assembly.Location),
                MetadataReference.CreateFromFile(typeof(TimeOfDay).Assembly.Location),
                MetadataReference.CreateFromFile(typeof(object).Assembly.Location),
                MetadataReference.CreateFromFile(typeof(Enumerable).Assembly.Location),
                MetadataReference.CreateFromFile(typeof(XmlDocument).Assembly.Location),
               // MetadataReference.CreateFromFile(@"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETPortable\v4.0\Profile\Profile328\mscorlib.dll")

            };

            references.AddRange(Directory.GetFiles(@"C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETFramework\v4.5\Facades").Select(f => MetadataReference.CreateFromFile(f)));

            var op = new CSharpCompilationOptions(OutputKind.DynamicallyLinkedLibrary);
            //op.WithAssemblyIdentityComparer(DesktopAssemblyIdentityComparer.Default);
            //CSharpCompilationOptions.WithAssemblyIdentityComparer(DesktopAssemblyIdentityComparer.Default);
            CSharpCompilation compilation = CSharpCompilation.Create(
                assemblyName,
                syntaxTrees: new[] { syntaxTree },
                references: references,
                options: op);
            Assembly assembly = null;
            using (var ms = new MemoryStream())
            {
                EmitResult result = compilation.Emit(ms);

                if (!result.Success)
                {
                    IEnumerable<Diagnostic> failures = result.Diagnostics.Where(diagnostic =>
                        //diagnostic.IsWarningAsError ||
                        diagnostic.Severity == DiagnosticSeverity.Error);

                    foreach (Diagnostic diagnostic in failures)
                    {
                        Console.Error.WriteLine("{0}: {1}", diagnostic.Id, diagnostic.GetMessage());
                    }
                }
                else
                {
                    ms.Seek(0, SeekOrigin.Begin);
                    assembly = Assembly.Load(ms.ToArray());                 
                }
        }

These are the errors I get

CS0012: The type 'Object' is defined in an assembly that is not referenced. You must add a reference to assembly 'mscorlib, Version=2.0.5.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e, Retargetable=Yes'.

CS0012: The type 'XmlReader' is defined in an assembly that is not referenced. You must add a reference to assembly 'System.Xml, Version=2.0.5.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e, Retargetable=Yes'.

Answer 1

As you predicted in the comments DesktopAssemblyIdentityComparer is the solution. However, CSharpCompilationOptions is immutable, and the WithAssemblyIdentityComparer method returns a new instance, so you have to use it like this:

var op = new CSharpCompilationOptions(OutputKind.DynamicallyLinkedLibrary);
op = op.WithAssemblyIdentityComparer(DesktopAssemblyIdentityComparer.Default);
CSharpCompilation compilation = CSharpCompilation.Create(
    assemblyName,
    syntaxTrees: new[] { syntaxTree },
    references: references,
    options: op);