创建map集合 （Map<int, bool> map = new Map();）

Question

Map<int, bool> map = new Map(); 会报错 Failed assertion: boolean expression must not be null

Answer 1

CrazyCodeBoy 2020-05-25 09:35:45

帮你试了下，Map<int, bool> map = new Map();是可以正常运行的，语法也不存在错误，Failed assertion: boolean expression must not be null的问题是由于你往map中存的数据有null的情况，在你向map中添加数据时加个null判断，存在null数据不往map中存。

• 提问者 hardman_ #1

  非常感谢！

Answer 2

海宁6 2020-09-11 21:31:39

he following assertion was thrown building KeyedSubtree-[<0>]:

Failed assertion: boolean expression must not be null

The relevant error-causing widget was:

  TabBarView

这是怎么回事啊？

Answer 3

cat199032 2020-05-25 09:32:42

并没有报错

• CrazyCodeBoy #1

  你遇到的什么问题呢