错误:实例成员...无法在初始化程序中访问 [英] Error: The instance member ... can't be accessed in an initializer

问题描述

为什么是这个代码:

class _SequentialTextPageState {
  String jsonTextPref = 'seqtext';
  int jsonTextSuff = 10;
  String jsonText = jsonTextPref + jsonTextSuff.toString();
}

产生这些错误?

Error: The instance member 'jsonTextPref' can't be accessed in an initializer.

Error: The instance member 'jsonTextSuff' can't be accessed in an initializer.

在我看来，String 和 int 之间的连接是正确的吗?

It seems to me that concatenation between String and int is correct?

推荐答案

您只能使用常量表达式作为初始值设定项.x=this.y 不是常数.

You can only use constant expressions as initializers. x=this.y is not constant.

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