Hello Davide and everyone.

Consider this function

public static class ParamArrayTester
{
  public static int ParamArrayObjects(params object[] values)
  {
    return values.Length;
  }
}

If I implement the following test:

[Test]
public void Test_ParamArrayObjects()
{
  Interpreter dexp = new Interpreter();
  
  dexp.Reference(typeof(ParamArrayTester));
  string expText = "ParamArrayTester.ParamArrayObjects(null, null, 0, 0)";
  Object resultObject = dexp.Eval(expText);
  
  Assert.AreEqual(4, (int)resultObject);
}

Exception :

System.ArgumentException: 'Incorrect number of arguments supplied for call to method 'Int32 ParamArrayObjects(System.Object[])' (Parameter 'method')'

On Stack:

ParseNormalMethodInvocation
return Expression.Call(instance, (MethodInfo)method.MethodBase, method.PromotedParameters);

The following call works perfectly :

string expText = "ParamArrayTester.ParamArrayObjects(0, null, null, null)";

So the guess is that the first parameter makes the difference somehow.

Thanks in advance, cheers.