The instance member 'params' can't be accessed in an initializer

问题

class LevelUp extends GetxController {
  Map<String, String> params = Get.arguments;

  var myTest = params.[comLevel];
}

Error report--"The instance member 'params' can't be accessed in an initializer." I am new to programming and this is being called directly from a widget. I checked the LevelUp map and it has contents. The error occurs where I am trying to assign the param value to myTest. It doesn't matter if I put the key in quotes or provide an integer. Any advice would be greatly appreciated.

回答1:

You can't access params before you've initialized the object. To fix your example, move your myTest initialization into a constructor.

Also, I don't believe you should have a period before [comLevel].

class LevelUp extends GetxController {
  Map<String, String> params = Get.arguments;
  String myTest;
  
  LevelUp() {
    myTest = params[comLevel];
  }
}

来源：https://stackoverflow.com/questions/63542776/the-instance-member-params-cant-be-accessed-in-an-initializer