class Program
{
  public static void Main()
  {
    Console.WriteLine(Action<BaseController>(x => x.ConvertHtmlToPdf));
  }

  public static string Action<T>(Expression<Func<T, Func<string, object>>> action)
  where T : new()
  {
    return action.Compile()(new T())("test") as string ?? "null";
  }
}

class BaseController
{
  public object ConvertHtmlToPdf(string name)
  {
    return string.Concat(name, name);
  }
}

class Program
{
  public static void Main()
  {
    Console.WriteLine(Action<BaseController>(x => (Func<string, object>)x.ConvertHtmlToPdf));
  }

  public static void Foo<T>(object wrapper)
  {
  }

  public static string Action<T>(Expression<Func<T, dynamic>> action)
  where T : new()
  {
    var method = ((MethodCallExpression) ((UnaryExpression) action.Body).Operand).Arguments
      .OfType<ConstantExpression>()
      .FirstOrDefault(a => a.Value is MethodInfo);
    return method == null ? "null" : ((MethodInfo) method.Value).Name;
  }
}

class BaseController
{
  public object ConvertHtmlToPdf(string name)
  {
    return string.Concat(name, name);
  }
}