Rush Frisby Rush Frisby - 3 months ago 60
C# Question

Using System.Dynamic in Roslyn

I modified the example that comes with the new version of Roslyn that was released yesterday to use dynamic and ExpandoObject but I am getting a compiler error which I am not sure how to fix. The error is:

(7,21): error CS0656: Missing compiler required member 'Microsoft.CSharp.RuntimeBinder.CSharpArgumentInfo.Create'

Can you not use dynamics in the new compiler yet? How can I fix this? Here is the example that I updated:

public void EndToEndCompileAndRun()
var text = @"using System.Dynamic;
public class Calculator
public static object Evaluate()
dynamic x = new ExpandoObject();
x.Result = 42;
return x.Result;

var tree = SyntaxFactory.ParseSyntaxTree(text);
var compilation = CSharpCompilation.Create(
options: new CSharpCompilationOptions(OutputKind.DynamicallyLinkedLibrary),
syntaxTrees: new[] {tree},
references: new[] {new MetadataFileReference(typeof (object).Assembly.Location), new MetadataFileReference(typeof (ExpandoObject).Assembly.Location)});

Assembly compiledAssembly;
using (var stream = new MemoryStream())
var compileResult = compilation.Emit(stream);
compiledAssembly = Assembly.Load(stream.GetBuffer());

Type calculator = compiledAssembly.GetType("Calculator");
MethodInfo evaluate = calculator.GetMethod("Evaluate");
string answer = evaluate.Invoke(null, null).ToString();

Assert.AreEqual("42", answer);


I think that you should reference the Microsoft.CSharp.dll assembly