如何在dart中获取子类的属性？

import 'dart:mirrors';

class Parent {
  String parentProperty = 'Parent Property';
}

class Child extends Parent {
  String childProperty = 'Child Property';
}

void main() {
  var child = Child();
}

void main() {
  var child = Child();
  
  InstanceMirror instanceMirror = reflect(child);
  ClassMirror classMirror = instanceMirror.type;
  
  classMirror.declarations.forEach((symbol, declaration) {
    if (declaration is VariableMirror) {
      print(declaration.simpleName.toString()); // 输出属性名
      print(instanceMirror.getField(symbol).reflectee); // 输出属性值
    }
  });
}