在C＃中使用动态访问匿名类型的字段-可能吗？

public JsonResult CalculateStuff(int coolArg)
{
    if(calculatePossible)
       return Json(CoolMethod(coolArg));
    else return Json(new { Calculated = false });
}

public void MyTest
{
    var controller = GetControllerInstance();
    var result = controller.CalculateStuff().Data as dynamic;
    Assert.IsTrue(result.Calculated == false);        
}