dart - 反射(reflect)非进口类

Question

我正在尝试获取动态类名称的属性(也试图实例化它)但下一个代码不起作用，因为我认为我需要导入在文件中包含类代码的 dart 文件我想反射(reflect)一下:

//I import the file in other Dart file
import 'MyClass.dart'; //This only have a class named MyClass with some properties
import 'OtherClass.dart'

class mainClass {
  void mainFunction () {
    var properties = OtherClass.getProperties('MyClass');
  }
}

这是 OtherClass 的内容:

import "dart:mirrors";

class OtherClass {
  static getProperties (String className) {
    ClassMirror cm = reflectClass(className);
    for (var m in cm.declarations.values)
      print(MirrorSystem.getName(m.simpleName));
  }
}

有没有反射(reflect)实际 Dart 文件中没有导入的类？

希望这是有道理的，提前致谢。

Answer 1

您需要先找到包含该类的库。使用 currentMirrorSystem().libraries 将所有库导入您的应用程序。如果您想避免歧义，请将唯一的库声明添加到您的库并将库名称传递给 getProperties() 以进行精确查找。

import "dart:mirrors";

class OtherClass {
  static getProperties(String className) {
    var classSymbol = new Symbol(className);
    var libs = currentMirrorSystem().libraries;
    var foundLibs = libs.keys.where((lm) =>
        libs[lm].declarations.containsKey(classSymbol) &&
            libs[lm].declarations[classSymbol] is ClassMirror);
    if (foundLibs.length != 1) {
      throw 'None or more than one library containing "${className}" class found';
    }
    ClassMirror cm = libs[foundLibs.first].declarations[classSymbol];
    for (var m
        in cm.declarations.values) print(MirrorSystem.getName(m.simpleName));
  }
}