飞镖 - 从使用反射调用的方法获得结果

发布于 2025-02-12 18:09:51 字数 622 浏览 2 评论 0原文

我正在尝试使用DART的Mirror API动态调用功能。

在通过dowork方法通过instancemirror调用时，我如何获得从dowork方法返回的结果，

class MyData {
  String someString;
}

class MyService {
  Future<MyData> doWork() async {
    print('doing work');
    return await Future(() => MyData()..someString = 'my result');
  }
}
void main() async {
  var instance = MyService();
  var mirrror = reflect(instance);
  var result = mirrror.invoke(#doWork, []);
}

我可以看到“做工作”被打印到控制台，所以我知道它是被调用的，但是我正在努力从Invoke函数中解释结果。

原文

I'm trying to use dart's mirror API to dynamically invoke a function.

How can I obtain the result that's returned from the doWork method when invoking it via an InstanceMirror

class MyData {
  String someString;
}

class MyService {
  Future<MyData> doWork() async {
    print('doing work');
    return await Future(() => MyData()..someString = 'my result');
  }
}
void main() async {
  var instance = MyService();
  var mirrror = reflect(instance);
  var result = mirrror.invoke(#doWork, []);
}

I can see that "doing work" gets printed to the console so I know it's being invoked, but I'm struggling to interpret the result from the invoke function.

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偷得浮生 2025-02-19 18:09:51

该值在属性Reflectee中的InstanceMirror内。这样的事情：

import 'dart:mirrors';

class MyData {
  String? someString;
}

class MyService {
  Future<MyData> doWork() async {
    print('doing work');
    return await Future(() => MyData()..someString = 'my result');
  }
}
void main() async {
  var instance = MyService();
  var mirrror = reflect(instance);
  var result = mirrror.invoke(#doWork, <dynamic>[]);
  var resultValue = await (result.reflectee as Future<MyData>);
  print(resultValue.someString); // my result
}

The value are inside the InstanceMirror in the property reflectee. So something like this:

import 'dart:mirrors';

class MyData {
  String? someString;
}

class MyService {
  Future<MyData> doWork() async {
    print('doing work');
    return await Future(() => MyData()..someString = 'my result');
  }
}
void main() async {
  var instance = MyService();
  var mirrror = reflect(instance);
  var result = mirrror.invoke(#doWork, <dynamic>[]);
  var resultValue = await (result.reflectee as Future<MyData>);
  print(resultValue.someString); // my result
}

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